Android 6.0 7.0 8.0 一个简单的app内更新版本-okgo app版本更新

 登陆时splash初始页调用接口检查app版本。如有更新，使用okGo的文件下载，保存到指定位置，调用Android安装apk。

<!-- Android 8.0 (Android O)为了针对一些流氓软件引导用户安装其他无关应用。在应用权限设置的“特殊访问权限”中，加入了“安装其他应用”的设置 -->
    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES"/>

package com.test.activity.sys;

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.Handler;
import android.os.Looper;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AlertDialog;
import android.text.format.Formatter;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.TextView;
import android.widget.Toast;

import com.lzy.okgo.OkGo;
import com.lzy.okgo.callback.FileCallback;
import com.lzy.okgo.callback.StringCallback;
import com.lzy.okgo.convert.FileConvert;
import com.lzy.okgo.model.Progress;
import com.lzy.okgo.model.Response;
import com.test.BuildConfig;
import com.test.Constant;
import com.test.R;
import com.test.activity.MainActivity;
import com.test.activity.sys.LoginActivity;
import com.test.util.DataUtils;

import com.test.view.NumberProgressBar;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.File;
import java.text.NumberFormat;

/**
 * @author cralor
 * @date 2018/8/8
 * 启动页 Activity
 */
public class SplashActivity extends Activity{

    public static final int INSTALL_APK_REQUESTCODE = 3;
    public static final int GET_UNKNOWN_APP_SOURCES = 7;
    private File apkFile;
    /**
     * 可以额外指定文件的下载目录和下载完成后的文件名
     */
    private String destFileDir = Environment.getExternalStorageDirectory() + FileConvert.DM_TARGET_FOLDER + "myAppDownload" + File.separator;

    private String destFileName = "myApp.apk";

    private Handler handler;
    private Context content;
    private TextView tvDownloadSize;
    private TextView tvProgress;
    private TextView tvNetSpeed;
    private NumberProgressBar pbProgress;

    private NumberFormat numberFormat;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        //去掉标题栏
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        //    getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN ,WindowManager.LayoutParams. FLAG_FULLSCREEN);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);
        content = this;
        handler = new Handler(Looper.getMainLooper());

        numberFormat = NumberFormat.getPercentInstance();
        numberFormat.setMinimumFractionDigits(2);
        initView();
    }

    /**
     * 打开程序时判断是否已经登陆过，且token有效
     */
    private void initView() {

        // ...

        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                OkGo.<String>post(Constant.GET_VERSION)
                        .tag(1)
                        .execute(new StringCallback() {
                            @Override
                            public void onSuccess(Response<String> response) {

                                String data = response.body();
                                String code = "";
                                String sysVersion = "";
                                try {
                                    JSONObject jsonObject = new JSONObject(data);
                                    code = jsonObject.get("code").toString();
                                    sysVersion = jsonObject.get("data").toString();
                                } catch (JSONException e) {
                                    e.printStackTrace();
                                }
                                Log.v("data",""+code);
                                if(Constant.SUCCESS_CODE.equals(code)){

                                    // Android studio 中 build.gradle 中的版本号
                                    // 获取PackageManager的实例
                                    PackageManager packageManager = getPackageManager();
                                    // getPackageName()是你当前类的包名，0代表是获取版本信息
                                    PackageInfo packInfo = null;
                                    String appVersion = "";
                                    try {
                                        packInfo = packageManager.getPackageInfo(getPackageName(), 0);
                                    } catch (PackageManager.NameNotFoundException e) {
                                        e.printStackTrace();
                                    }
                                    if (packInfo != null) {
                                        appVersion = packInfo.versionName;
                                    }

                                    if(appVersion.equals(sysVersion)){
                                        Intent intent = new Intent(SplashActivity.this, MainActivity.class);
                                        startActivity(intent);
                                        finish();
                                    }else{
                                        Log.e("SplashActivity","需要更新版本到---"+sysVersion);
                                        Toast.makeText(content, "有新版本需要更新", Toast.LENGTH_SHORT).show();
                                        getVersion();
                                    }
                                }
                            }
                            @Override
                            public void onError(Response<String> response) {
                                Toast.makeText(content, "请求失败", Toast.LENGTH_SHORT).show();
                                Intent intent = new Intent(SplashActivity.this, LoginActivity.class);
                                startActivity(intent);
                                overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
                                finish();
                            }
                        });
            }
        }, 3);
    }

    /**
     * 更新弹出框
     */
    public void getVersion(){
        //退出的确认弹出框
        new AlertDialog.Builder(content)
                .setTitle("提示")
                .setMessage("请更新最新版本")
                .setCancelable(false)
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int whichButton) {
                        Toast.makeText(content, "dianjixiazai ", Toast.LENGTH_SHORT).show();
                        fileDownload();
                        View  view1 = getLayoutInflater().inflate(R.layout.update_app_progress, null);

                        tvDownloadSize = view1.findViewById(R.id.downloadSize);
                        tvProgress = view1.findViewById(R.id.tvProgress);
                        tvNetSpeed = view1.findViewById(R.id.netSpeed);
                        pbProgress = view1.findViewById(R.id.pbProgress);

                        AlertDialog.Builder builder = new AlertDialog.Builder(content);
                        builder.setTitle("正在下载");
                        builder.setView(view1);
                        builder.setCancelable(false);
                        builder.setNegativeButton("取消", new DialogInterface.OnClickListener()
                        {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                finish();
                            }
                        });
                        builder.create().show();
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int whichButton) {
                        finish();
                    }
                })
                .show();
    }

    /**
     * 获取服务器apk
     */
    public void fileDownload() {
        //检查是否获得写入权限，未获得则向用户请求。Android 7.0 以上需要动态获取权限
        if (ActivityCompat.checkSelfPermission(SplashActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            //未获得，向用户请求
            ActivityCompat.requestPermissions(SplashActivity.this, new String[]
                    {Manifest.permission.WRITE_EXTERNAL_STORAGE}, 200);
        }
        OkGo.<File>get("https://app地址/app.apk")
                .tag(1)
                .headers("header1", "headerValue1")
                .params("param1", "paramValue1")
                /*
                * 文件目录如果不指定,默认下载的目录为 sdcard/download/,文件名如果不指定,则按照以下规则命名:
                1.首先检查用户是否传入了文件名,如果传入,将以用户传入的文件名命名
                2.如果没有传入,那么将会检查服务端返回的响应头是否含有Content-Disposition=attachment;filename=FileName.txt该种形式的响应头,如果有,则按照该响应头中指定的文件名命名文件,如FileName.txt
                3.如果上述响应头不存在,则检查下载的文件url,例如:http://image.baidu.com/abc.jpg,那么将会自动以abc.jpg命名文件
                4.如果url也把文件名解析不出来,那么最终将以"unknownfile_" + System.currentTimeMillis()命名文件
                */
                .execute(new FileCallback(""+destFileDir, ""+destFileName) {
                    @Override
                    public void onSuccess(Response<File> response) {

                        String absolutePath = response.body().getAbsolutePath();
                        apkFile = response.body().getAbsoluteFile();
                        Log.e("appInstall---", ""+absolutePath);

                        //Android8.0 版本更新无法自动安装问题解决
                        if (Build.VERSION.SDK_INT >= 26) {
                            //来判断应用是否有权限安装apk
                            Log.e("appInstall---", "android版本8.0以上");
                            boolean installAllowed= getPackageManager().canRequestPackageInstalls();
                            //有权限
                            if (installAllowed) {
                                //安装apk
                                Log.e("appInstall---", "有权限安装apk");
                                installApk(apkFile);
                            } else {
                                //无权限 申请权限
                                Log.e("appInstall---", "无权限 申请权限");
                                ActivityCompat.requestPermissions(SplashActivity.this, new String[]{Manifest.permission.REQUEST_INSTALL_PACKAGES}, INSTALL_APK_REQUESTCODE);
                            }
                        } else {
                            Log.e("appInstall---", "android版本低于8.0");
                            installApk(apkFile);
                        }
                    }
                    @Override
                    public void onError(Response<File> response) {
                        Throwable exception = response.getException();
                        exception.printStackTrace();
                        Log.e("eeeee", exception.getMessage());
                    }
                    @Override
                    public void downloadProgress(Progress progress) {
                        System.out.println(progress);
                        String downloadLength = Formatter.formatFileSize(getApplicationContext(), progress.currentSize);
                        String totalLength = Formatter.formatFileSize(getApplicationContext(), progress.totalSize);
                        tvDownloadSize.setText(downloadLength + "/" + totalLength);
                        String speed = Formatter.formatFileSize(getApplicationContext(), progress.speed);
                        tvNetSpeed.setText(String.format("%s/s", speed));
                        tvProgress.setText(numberFormat.format(progress.fraction));
                        pbProgress.setMax(10000);
                        pbProgress.setProgress((int) (progress.fraction * 10000));
                    }
                });
    }

    /**
     * 权限申请回调
     * @param requestCode requestCode
     * @param permissions permissions
     * @param grantResults grantResults
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case INSTALL_APK_REQUESTCODE:
                //有注册权限且用户允许安装
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Log.e("appInstall---", "有注册权限且用户允许安装");
                    installApk(apkFile);
                } else {
                    //将用户引导至安装未知应用界面。
                    Intent intent = new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES);
                    startActivityForResult(intent, GET_UNKNOWN_APP_SOURCES);
                    Log.e("appInstall---", "将用户引导至安装未知应用界面");
                }
                break;
            default:break;
        }
    }

    /**
     * 将用户引导至安装未知应用界面，允许安装未知应用后，回到当前activity继续安装应用
     * @param requestCode requestCode
     * @param resultCode resultCode
     * @param data data
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.e("appInstall---", "将用户引导至安装未知应用界面，允许安装未知应用后，回到当前activity继续安装应用");
        installApk(apkFile);
    }
    /**
     * 安装APK
     * @param apkFile apkFile
     */
    public void installApk(File apkFile){
        //判读版本是否在7.0以上
        if(Build.VERSION.SDK_INT >= 24) {
            Log.e("appInstall---", "android版本7.");
            //在AndroidManifest中的android:authorities的值， BuildConfig.APPLICATION_ID = com.test
            Uri apkUri = FileProvider.getUriForFile(content, BuildConfig.APPLICATION_ID+".provider", apkFile);
　　　　　　　Intent install = new Intent(Intent.ACTION_VIEW);
            install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            install.setDataAndType(apkUri, "application/vnd.android.package-archive");
            startActivity(install);
        } else {
            Log.e("appInstall---", "android版本低于7.0");
            Intent install = new Intent(Intent.ACTION_VIEW);
            install.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");
            install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(install);

        }
        finish();
    }


    /**
     * 调用默认浏览器下载apk
     */
    public void getApk(){
        Uri uri = Uri.parse("https://lighttruck.com.cn:8086/app.apk");
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
        startActivity(intent);
    }

}

activity_splash.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context="com.test.activity.sys.SplashActivity">

</LinearLayout>

初始页面自定义主题

<!-- 加载页面 -->
<activity
    android:name=".activity.sys.SplashActivity"
    android:theme="@style/SplashTheme">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

   <style name="SplashTheme" parent="AppBaseTheme">
        <!-- 欢迎页背景引用刚才写好的 -->
        <item name="android:windowBackground">@drawable/splash</item>
        <item name="android:windowFullscreen">true</item>
        <!-- <item name="android:windowIsTranslucent">true</item> --> <!-- 透明背景 -->
    </style>

update_app_progress.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/update_app_progress"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@color/bg_gray"
    android:orientation="vertical" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:layout_marginTop="10dp">

        <TextView
            android:id="@+id/downloadSize"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:text="--M/--M"
            android:textSize="10sp"/>

        <TextView
            android:id="@+id/netSpeed"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:layout_marginRight="10dp"
            android:text="---K/s"
            android:textSize="10sp"/>

        <TextView
            android:id="@+id/tvProgress"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:text="--.--%"
            android:textSize="10sp"/>

    </RelativeLayout>

    <com.test.view.NumberProgressBar
        android:id="@+id/pbProgress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:progress_reached_bar_height="1.5dp"
        app:progress_reached_color="#3498DB"
        app:progress_text_color="#3498DB"
        app:progress_text_size="10sp"
        app:progress_unreached_bar_height="0.75dp"
        app:progress_unreached_color="#CCCCCC"/>
</LinearLayout>

NumberProgressBar 为okGo中的view

/*
 * Copyright 2016 jeasonlzy(廖子尧)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.test.view;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.View;

import com.test.R;


/**
 * ================================================
 * 作    者：jeasonlzy（廖子尧）Github地址：https://github.com/jeasonlzy
 * 版    本：1.0
 * 创建日期：16/9/11
 * 描    述：
 * 修订历史：
 * ================================================
 */
public class NumberProgressBar extends View {

    public interface OnProgressBarListener {

        void onProgressChange(int current, int max);
    }

    private int mMaxProgress = 100;

    /**
     * Current progress, can not exceed the max progress.
     */
    private int mCurrentProgress = 0;

    /**
     * The progress area bar color.
     */
    private int mReachedBarColor;

    /**
     * The bar unreached area color.
     */
    private int mUnreachedBarColor;

    /**
     * The progress text color.
     */
    private int mTextColor;

    /**
     * The progress text size.
     */
    private float mTextSize;

    /**
     * The height of the reached area.
     */
    private float mReachedBarHeight;

    /**
     * The height of the unreached area.
     */
    private float mUnreachedBarHeight;

    /**
     * The suffix of the number.
     */
    private String mSuffix = "%";

    /**
     * The prefix.
     */
    private String mPrefix = "";

    private final int default_text_color = Color.rgb(66, 145, 241);
    private final int default_reached_color = Color.rgb(66, 145, 241);
    private final int default_unreached_color = Color.rgb(204, 204, 204);
    private final float default_progress_text_offset;
    private final float default_text_size;
    private final float default_reached_bar_height;
    private final float default_unreached_bar_height;

    /**
     * For save and restore instance of progressbar.
     */
    private static final String INSTANCE_STATE = "saved_instance";
    private static final String INSTANCE_TEXT_COLOR = "text_color";
    private static final String INSTANCE_TEXT_SIZE = "text_size";
    private static final String INSTANCE_REACHED_BAR_HEIGHT = "reached_bar_height";
    private static final String INSTANCE_REACHED_BAR_COLOR = "reached_bar_color";
    private static final String INSTANCE_UNREACHED_BAR_HEIGHT = "unreached_bar_height";
    private static final String INSTANCE_UNREACHED_BAR_COLOR = "unreached_bar_color";
    private static final String INSTANCE_MAX = "max";
    private static final String INSTANCE_PROGRESS = "progress";
    private static final String INSTANCE_SUFFIX = "suffix";
    private static final String INSTANCE_PREFIX = "prefix";
    private static final String INSTANCE_TEXT_VISIBILITY = "text_visibility";

    private static final int PROGRESS_TEXT_VISIBLE = 0;

    /**
     * The width of the text that to be drawn.
     */
    private float mDrawTextWidth;

    /**
     * The drawn text start.
     */
    private float mDrawTextStart;

    /**
     * The drawn text end.
     */
    private float mDrawTextEnd;

    /**
     * The text that to be drawn in onDraw().
     */
    private String mCurrentDrawText;

    /**
     * The Paint of the reached area.
     */
    private Paint mReachedBarPaint;
    /**
     * The Paint of the unreached area.
     */
    private Paint mUnreachedBarPaint;
    /**
     * The Paint of the progress text.
     */
    private Paint mTextPaint;

    /**
     * Unreached bar area to draw rect.
     */
    private RectF mUnreachedRectF = new RectF(0, 0, 0, 0);
    /**
     * Reached bar area rect.
     */
    private RectF mReachedRectF = new RectF(0, 0, 0, 0);

    /**
     * The progress text offset.
     */
    private float mOffset;

    /**
     * Determine if need to draw unreached area.
     */
    private boolean mDrawUnreachedBar = true;

    private boolean mDrawReachedBar = true;

    private boolean mIfDrawText = true;

    /**
     * Listener
     */
    private OnProgressBarListener mListener;

    public enum ProgressTextVisibility {
        Visible, Invisible
    }

    public NumberProgressBar(Context context) {
        this(context, null);
    }

    public NumberProgressBar(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public NumberProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        default_reached_bar_height = dp2px(1.5f);
        default_unreached_bar_height = dp2px(1.0f);
        default_text_size = sp2px(10);
        default_progress_text_offset = dp2px(3.0f);

        //load styled attributes.
        final TypedArray attributes = context.getTheme().obtainStyledAttributes(attrs, R.styleable.NumberProgressBar, defStyleAttr, 0);

        mReachedBarColor = attributes.getColor(R.styleable.NumberProgressBar_progress_reached_color, default_reached_color);
        mUnreachedBarColor = attributes.getColor(R.styleable.NumberProgressBar_progress_unreached_color, default_unreached_color);
        mTextColor = attributes.getColor(R.styleable.NumberProgressBar_progress_text_color, default_text_color);
        mTextSize = attributes.getDimension(R.styleable.NumberProgressBar_progress_text_size, default_text_size);

        mReachedBarHeight = attributes.getDimension(R.styleable.NumberProgressBar_progress_reached_bar_height, default_reached_bar_height);
        mUnreachedBarHeight = attributes.getDimension(R.styleable.NumberProgressBar_progress_unreached_bar_height, default_unreached_bar_height);
        mOffset = attributes.getDimension(R.styleable.NumberProgressBar_progress_text_offset, default_progress_text_offset);

        int textVisible = attributes.getInt(R.styleable.NumberProgressBar_progress_text_visibility, PROGRESS_TEXT_VISIBLE);
        if (textVisible != PROGRESS_TEXT_VISIBLE) {
            mIfDrawText = false;
        }

        setProgress(attributes.getInt(R.styleable.NumberProgressBar_progress_current, 0));
        setMax(attributes.getInt(R.styleable.NumberProgressBar_progress_max, 100));

        attributes.recycle();
        initializePainters();
    }

    @Override
    protected int getSuggestedMinimumWidth() {
        return (int) mTextSize;
    }

    @Override
    protected int getSuggestedMinimumHeight() {
        return Math.max((int) mTextSize, Math.max((int) mReachedBarHeight, (int) mUnreachedBarHeight));
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        setMeasuredDimension(measure(widthMeasureSpec, true), measure(heightMeasureSpec, false));
    }

    private int measure(int measureSpec, boolean isWidth) {
        int result;
        int mode = MeasureSpec.getMode(measureSpec);
        int size = MeasureSpec.getSize(measureSpec);
        int padding = isWidth ? getPaddingLeft() + getPaddingRight() : getPaddingTop() + getPaddingBottom();
        if (mode == MeasureSpec.EXACTLY) {
            result = size;
        } else {
            result = isWidth ? getSuggestedMinimumWidth() : getSuggestedMinimumHeight();
            result += padding;
            if (mode == MeasureSpec.AT_MOST) {
                if (isWidth) {
                    result = Math.max(result, size);
                } else {
                    result = Math.min(result, size);
                }
            }
        }
        return result;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (mIfDrawText) {
            calculateDrawRectF();
        } else {
            calculateDrawRectFWithoutProgressText();
        }

        if (mDrawReachedBar) {
            canvas.drawRect(mReachedRectF, mReachedBarPaint);
        }

        if (mDrawUnreachedBar) {
            canvas.drawRect(mUnreachedRectF, mUnreachedBarPaint);
        }

        if (mIfDrawText) canvas.drawText(mCurrentDrawText, mDrawTextStart, mDrawTextEnd, mTextPaint);
    }

    private void initializePainters() {
        mReachedBarPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mReachedBarPaint.setColor(mReachedBarColor);

        mUnreachedBarPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mUnreachedBarPaint.setColor(mUnreachedBarColor);

        mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mTextPaint.setColor(mTextColor);
        mTextPaint.setTextSize(mTextSize);
    }

    private void calculateDrawRectFWithoutProgressText() {
        mReachedRectF.left = getPaddingLeft();
        mReachedRectF.top = getHeight() / 2.0f - mReachedBarHeight / 2.0f;
        mReachedRectF.right = (getWidth() - getPaddingLeft() - getPaddingRight()) / (getMax() * 1.0f) * getProgress() + getPaddingLeft();
        mReachedRectF.bottom = getHeight() / 2.0f + mReachedBarHeight / 2.0f;

        mUnreachedRectF.left = mReachedRectF.right;
        mUnreachedRectF.right = getWidth() - getPaddingRight();
        mUnreachedRectF.top = getHeight() / 2.0f + -mUnreachedBarHeight / 2.0f;
        mUnreachedRectF.bottom = getHeight() / 2.0f + mUnreachedBarHeight / 2.0f;
    }

    private void calculateDrawRectF() {

        mCurrentDrawText = String.format("%d", getProgress() * 100 / getMax());
        mCurrentDrawText = mPrefix + mCurrentDrawText + mSuffix;
        mDrawTextWidth = mTextPaint.measureText(mCurrentDrawText);

        if (getProgress() == 0) {
            mDrawReachedBar = false;
            mDrawTextStart = getPaddingLeft();
        } else {
            mDrawReachedBar = true;
            mReachedRectF.left = getPaddingLeft();
            mReachedRectF.top = getHeight() / 2.0f - mReachedBarHeight / 2.0f;
            mReachedRectF.right = (getWidth() - getPaddingLeft() - getPaddingRight()) / (getMax() * 1.0f) * getProgress() - mOffset + getPaddingLeft();
            mReachedRectF.bottom = getHeight() / 2.0f + mReachedBarHeight / 2.0f;
            mDrawTextStart = (mReachedRectF.right + mOffset);
        }

        mDrawTextEnd = (int) ((getHeight() / 2.0f) - ((mTextPaint.descent() + mTextPaint.ascent()) / 2.0f));

        if ((mDrawTextStart + mDrawTextWidth) >= getWidth() - getPaddingRight()) {
            mDrawTextStart = getWidth() - getPaddingRight() - mDrawTextWidth;
            mReachedRectF.right = mDrawTextStart - mOffset;
        }

        float unreachedBarStart = mDrawTextStart + mDrawTextWidth + mOffset;
        if (unreachedBarStart >= getWidth() - getPaddingRight()) {
            mDrawUnreachedBar = false;
        } else {
            mDrawUnreachedBar = true;
            mUnreachedRectF.left = unreachedBarStart;
            mUnreachedRectF.right = getWidth() - getPaddingRight();
            mUnreachedRectF.top = getHeight() / 2.0f + -mUnreachedBarHeight / 2.0f;
            mUnreachedRectF.bottom = getHeight() / 2.0f + mUnreachedBarHeight / 2.0f;
        }
    }

    /**
     * Get progress text color.
     *
     * @return progress text color.
     */
    public int getTextColor() {
        return mTextColor;
    }

    /**
     * Get progress text size.
     *
     * @return progress text size.
     */
    public float getProgressTextSize() {
        return mTextSize;
    }

    public int getUnreachedBarColor() {
        return mUnreachedBarColor;
    }

    public int getReachedBarColor() {
        return mReachedBarColor;
    }

    public int getProgress() {
        return mCurrentProgress;
    }

    public int getMax() {
        return mMaxProgress;
    }

    public float getReachedBarHeight() {
        return mReachedBarHeight;
    }

    public float getUnreachedBarHeight() {
        return mUnreachedBarHeight;
    }

    public void setProgressTextSize(float textSize) {
        this.mTextSize = textSize;
        mTextPaint.setTextSize(mTextSize);
        invalidate();
    }

    public void setProgressTextColor(int textColor) {
        this.mTextColor = textColor;
        mTextPaint.setColor(mTextColor);
        invalidate();
    }

    public void setUnreachedBarColor(int barColor) {
        this.mUnreachedBarColor = barColor;
        mUnreachedBarPaint.setColor(mUnreachedBarColor);
        invalidate();
    }

    public void setReachedBarColor(int progressColor) {
        this.mReachedBarColor = progressColor;
        mReachedBarPaint.setColor(mReachedBarColor);
        invalidate();
    }

    public void setReachedBarHeight(float height) {
        mReachedBarHeight = height;
    }

    public void setUnreachedBarHeight(float height) {
        mUnreachedBarHeight = height;
    }

    public void setMax(int maxProgress) {
        if (maxProgress > 0) {
            this.mMaxProgress = maxProgress;
            invalidate();
        }
    }

    public void setSuffix(String suffix) {
        if (suffix == null) {
            mSuffix = "";
        } else {
            mSuffix = suffix;
        }
    }

    public String getSuffix() {
        return mSuffix;
    }

    public void setPrefix(String prefix) {
        if (prefix == null) mPrefix = "";
        else {
            mPrefix = prefix;
        }
    }

    public String getPrefix() {
        return mPrefix;
    }

    public void incrementProgressBy(int by) {
        if (by > 0) {
            setProgress(getProgress() + by);
        }

        if (mListener != null) {
            mListener.onProgressChange(getProgress(), getMax());
        }
    }

    public void setProgress(int progress) {
        if (progress <= getMax() && progress >= 0) {
            this.mCurrentProgress = progress;
            invalidate();
        }
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        final Bundle bundle = new Bundle();
        bundle.putParcelable(INSTANCE_STATE, super.onSaveInstanceState());
        bundle.putInt(INSTANCE_TEXT_COLOR, getTextColor());
        bundle.putFloat(INSTANCE_TEXT_SIZE, getProgressTextSize());
        bundle.putFloat(INSTANCE_REACHED_BAR_HEIGHT, getReachedBarHeight());
        bundle.putFloat(INSTANCE_UNREACHED_BAR_HEIGHT, getUnreachedBarHeight());
        bundle.putInt(INSTANCE_REACHED_BAR_COLOR, getReachedBarColor());
        bundle.putInt(INSTANCE_UNREACHED_BAR_COLOR, getUnreachedBarColor());
        bundle.putInt(INSTANCE_MAX, getMax());
        bundle.putInt(INSTANCE_PROGRESS, getProgress());
        bundle.putString(INSTANCE_SUFFIX, getSuffix());
        bundle.putString(INSTANCE_PREFIX, getPrefix());
        bundle.putBoolean(INSTANCE_TEXT_VISIBILITY, getProgressTextVisibility());
        return bundle;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state instanceof Bundle) {
            final Bundle bundle = (Bundle) state;
            mTextColor = bundle.getInt(INSTANCE_TEXT_COLOR);
            mTextSize = bundle.getFloat(INSTANCE_TEXT_SIZE);
            mReachedBarHeight = bundle.getFloat(INSTANCE_REACHED_BAR_HEIGHT);
            mUnreachedBarHeight = bundle.getFloat(INSTANCE_UNREACHED_BAR_HEIGHT);
            mReachedBarColor = bundle.getInt(INSTANCE_REACHED_BAR_COLOR);
            mUnreachedBarColor = bundle.getInt(INSTANCE_UNREACHED_BAR_COLOR);
            initializePainters();
            setMax(bundle.getInt(INSTANCE_MAX));
            setProgress(bundle.getInt(INSTANCE_PROGRESS));
            setPrefix(bundle.getString(INSTANCE_PREFIX));
            setSuffix(bundle.getString(INSTANCE_SUFFIX));
            setProgressTextVisibility(bundle.getBoolean(INSTANCE_TEXT_VISIBILITY) ? ProgressTextVisibility.Visible : ProgressTextVisibility.Invisible);
            super.onRestoreInstanceState(bundle.getParcelable(INSTANCE_STATE));
            return;
        }
        super.onRestoreInstanceState(state);
    }

    public float dp2px(float dp) {
        final float scale = getResources().getDisplayMetrics().density;
        return dp * scale + 0.5f;
    }

    public float sp2px(float sp) {
        final float scale = getResources().getDisplayMetrics().scaledDensity;
        return sp * scale;
    }

    public void setProgressTextVisibility(ProgressTextVisibility visibility) {
        mIfDrawText = visibility == ProgressTextVisibility.Visible;
        invalidate();
    }

    public boolean getProgressTextVisibility() {
        return mIfDrawText;
    }

    public void setOnProgressBarListener(OnProgressBarListener listener) {
        mListener = listener;
    }
}