android136 360 拖拽

差补器原理：

图标拖拽：

   

activity_drag_view.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    
    <!-- 2个TextView，一个显示一个隐藏 -->
    <TextView
        android:id="@+id/tv_top"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:background="@drawable/call_locate_blue"
        android:gravity="center"
        android:padding="15dp"
        android:text="按住提示框拖到任意位置
按手机返回键立即生效"
        android:textColor="@color/black"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/tv_bottom"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:background="@drawable/call_locate_blue"
        android:gravity="center"
        android:padding="10dp"
        android:text="按住提示框拖到任意位置
按手机返回键立即生效"
        android:textColor="@color/black"
        android:textSize="18sp"
        android:visibility="invisible" />

    <!-- 拖拽的图片 -->
    <ImageView
        android:id="@+id/iv_drag"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="90dp"
        android:src="@drawable/drag" />

</RelativeLayout>

                        

package com.itheima52.mobilesafe.activity;

import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.itheima52.mobilesafe.R;

/**
 * 修改归属地显示位置
 * 
 * 半透明效果：清单文件<activity
            android:name=".activity.DragViewActivity"
            android:theme="@android:style/Theme.Translucent.NoTitleBar" />   这个acticity透明没有标题栏。


xml文件<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:background="#5000"                背景半透明
    >
 */
public class DragViewActivity extends Activity {

    private TextView tvTop;
    private TextView tvBottom;

    private ImageView ivDrag;

    private int startX;
    private int startY;
    private SharedPreferences mPref;

    long[] mHits = new long[2];// 数组长度表示要点击的次数

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_drag_view);

        mPref = getSharedPreferences("config", MODE_PRIVATE);

        tvTop = (TextView) findViewById(R.id.tv_top);
        tvBottom = (TextView) findViewById(R.id.tv_bottom);
        ivDrag = (ImageView) findViewById(R.id.iv_drag);

        int lastX = mPref.getInt("lastX", 0);
        int lastY = mPref.getInt("lastY", 0);

        // 获取屏幕宽高
        final int winWidth = getWindowManager().getDefaultDisplay().getWidth();
        final int winHeight = getWindowManager().getDefaultDisplay().getHeight();

        if (lastY > winHeight / 2) {// 上边显示,下边隐藏
            tvTop.setVisibility(View.VISIBLE);
            tvBottom.setVisibility(View.INVISIBLE);
        } else {
            tvTop.setVisibility(View.INVISIBLE);
            tvBottom.setVisibility(View.VISIBLE);
        }
        // ivDrag.getWidth();获取不到，因为还没有绘制完毕。
        // onMeasure(测量view), onLayout(安放位置), onDraw(绘制)
        // ivDrag.layout(lastX, lastY, lastX + ivDrag.getWidth(),lastY + ivDrag.getHeight());//不能用这个方法,因为还没有测量完成,就不能安放位置，下面的方法就可以，RelativeLayout是控件的父控件。
        RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) ivDrag.getLayoutParams();// 获取布局对象
        layoutParams.leftMargin = lastX;// 设置左边距
        layoutParams.topMargin = lastY;// 设置top边距
        ivDrag.setLayoutParams(layoutParams);// 重新设置位置

        ivDrag.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                System.arraycopy(mHits, 1, mHits, 0, mHits.length - 1);
                mHits[mHits.length - 1] = SystemClock.uptimeMillis();// 开机后开始计算的时间
                if (mHits[0] >= (SystemClock.uptimeMillis() - 500)) {
                    // 把图片居中
                    ivDrag.layout(winWidth / 2 - ivDrag.getWidth() / 2,
                            ivDrag.getTop(), winWidth / 2 + ivDrag.getWidth()
                                    / 2, ivDrag.getBottom());
                }
            }
        });

        // 设置触摸监听
        ivDrag.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    // 初始化起点坐标
                    startX = (int) event.getRawX();
                    startY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    int endX = (int) event.getRawX();
                    int endY = (int) event.getRawY();

                    // 计算移动偏移量
                    int dx = endX - startX;
                    int dy = endY - startY;

                    // 更新左上右下距离
                    int l = ivDrag.getLeft() + dx;
                    int r = ivDrag.getRight() + dx;

                    int t = ivDrag.getTop() + dy;
                    int b = ivDrag.getBottom() + dy;

                    // 判断是否超出屏幕边界, 注意状态栏的高度
                    if (l < 0 || r > winWidth || t < 0 || b > winHeight - 20) {
                        break;
                    }

                    // 根据图片位置,决定提示框显示和隐藏
                    if (t > winHeight / 2) {// 上边显示,下边隐藏
                        tvTop.setVisibility(View.VISIBLE);
                        tvBottom.setVisibility(View.INVISIBLE);
                    } else {
                        tvTop.setVisibility(View.INVISIBLE);
                        tvBottom.setVisibility(View.VISIBLE);
                    }

                    // 更新界面（左上右下），因为已经绘制完成了，所以可以使用layout()方法。
                    ivDrag.layout(l, t, r, b);

                    // 重新初始化起点坐标
                    startX = (int) event.getRawX();
                    startY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_UP:
                    // 记录坐标点
                    Editor edit = mPref.edit();
                    edit.putInt("lastX", ivDrag.getLeft());
                    edit.putInt("lastY", ivDrag.getTop());
                    edit.commit();
                    break;
                default:
                    break;
                }
                return false;//事件要向下传递,让onclick(双击事件)可以响应
            }
        });
    }
}

/**
     * 自定义归属地浮窗Toast， 需要权限android.permission.SYSTEM_ALERT_WINDOW
     */
    private void showToast(String text) {
        mWM = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);

        // 获取屏幕宽高
        winWidth = mWM.getDefaultDisplay().getWidth();
        winHeight = mWM.getDefaultDisplay().getHeight();

        params = new WindowManager.LayoutParams();
        params.height = WindowManager.LayoutParams.WRAP_CONTENT;
        params.width = WindowManager.LayoutParams.WRAP_CONTENT;
        params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
        params.format = PixelFormat.TRANSLUCENT;
        params.type = WindowManager.LayoutParams.TYPE_PHONE;// 电话窗口。它用于电话交互（特别是呼入）。它置于所有应用程序之上，状态栏之下。
        params.gravity = Gravity.LEFT + Gravity.TOP;// 将重心位置设置为左上方,
                                                    // 也就是(0,0)从左上方开始,而不是默认的重心位置
        params.setTitle("Toast");

        int lastX = mPref.getInt("lastX", 0);
        int lastY = mPref.getInt("lastY", 0);

        // 设置浮窗的位置, 基于左上方的偏移量
        params.x = lastX;
        params.y = lastY;

        // view = new TextView(this);
        view = View.inflate(this, R.layout.toast_address, null);

        int[] bgs = new int[] { R.drawable.call_locate_white,
                R.drawable.call_locate_orange, R.drawable.call_locate_blue,
                R.drawable.call_locate_gray, R.drawable.call_locate_green };
        int style = mPref.getInt("address_style", 0);

        view.setBackgroundResource(bgs[style]);// 根据存储的样式更新背景

        TextView tvText = (TextView) view.findViewById(R.id.tv_number);
        tvText.setText(text);

        mWM.addView(view, params);// 将view添加在屏幕上(Window)

        view.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    // 初始化起点坐标
                    startX = (int) event.getRawX();
                    startY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    int endX = (int) event.getRawX();
                    int endY = (int) event.getRawY();

                    // 计算移动偏移量
                    int dx = endX - startX;
                    int dy = endY - startY;

                    // 更新浮窗位置，WindowManager里面只可以用params实现位置的移动
                    params.x += dx;
                    params.y += dy;

                    // 防止坐标偏离屏幕
                    if (params.x < 0) {
                        params.x = 0;
                    }

                    if (params.y < 0) {
                        params.y = 0;
                    }

                    // 防止坐标偏离屏幕
                    if (params.x > winWidth - view.getWidth()) {
                        params.x = winWidth - view.getWidth();
                    }

                    if (params.y > winHeight - view.getHeight()) {
                        params.y = winHeight - view.getHeight();
                    }

                    // System.out.println("x:" + params.x + ";y:" + params.y);

                    mWM.updateViewLayout(view, params);

                    // 重新初始化起点坐标
                    startX = (int) event.getRawX();
                    startY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_UP:
                    // 记录坐标点
                    Editor edit = mPref.edit();
                    edit.putInt("lastX", params.x);
                    edit.putInt("lastY", params.y);
                    edit.commit();
                    break;

                default:
                    break;
                }
                return true;
            }
        });
    }