Android 模仿bilibili弹幕

运行效果

MainActivity.java

package demo.ligong.sdut.danmutest;

import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.VideoView;

import java.util.Random;

import master.flame.danmaku.controller.DrawHandler;
import master.flame.danmaku.danmaku.model.BaseDanmaku;
import master.flame.danmaku.danmaku.model.DanmakuTimer;
import master.flame.danmaku.danmaku.model.IDanmakus;
import master.flame.danmaku.danmaku.model.android.DanmakuContext;
import master.flame.danmaku.danmaku.model.android.Danmakus;
import master.flame.danmaku.danmaku.parser.BaseDanmakuParser;
import master.flame.danmaku.ui.widget.DanmakuView;

public class MainActivity extends AppCompatActivity {

    private boolean showDanmaku;

    private DanmakuView danmakuView;

    private DanmakuContext danmakuContext;
     //创建一个弹幕的解析器才行，这里直接创建了一个全局的BaseDanmakuParser。
    private BaseDanmakuParser parser = new BaseDanmakuParser() {
        @Override
        protected IDanmakus parse() {
            return new Danmakus();
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取VideoView的实例
        VideoView videoView = (VideoView) findViewById(R.id.video_view);
        //设置视频文件的地址
        videoView.setVideoPath(Environment.getDataDirectory() + "/Pixels.mp4");
        videoView.start();
        //我们先是获取到了DanmakuView控件的实例
        danmakuView = (DanmakuView) findViewById(R.id.danmaku_view);
        //然后调用了enableDanmakuDrawingCache()方法来提升绘制效率
        danmakuView.enableDanmakuDrawingCache(true);
        //又调用了setCallback()方法来设置回调函数。
        danmakuView.setCallback(new DrawHandler.Callback() {
            @Override
            public void prepared() {
                showDanmaku = true;
                danmakuView.start();
                generateSomeDanmaku();
            }

            @Override
            public void updateTimer(DanmakuTimer timer) {

            }

            @Override
            public void danmakuShown(BaseDanmaku danmaku) {

            }

            @Override
            public void drawingFinished() {

            }
        });
        //调用DanmakuContext.create()方法创建了一个DanmakuContext的实例
        danmakuContext = danmakuContext.create();

        danmakuView.prepare(parser,danmakuContext);

        final LinearLayout operationLayout = (LinearLayout) findViewById(R.id.operation_layout);
        final Button send = (Button) findViewById(R.id.send);
        final EditText editText = (EditText) findViewById(R.id.edit_text);
        danmakuView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(operationLayout.getVisibility() == View.GONE){
                    operationLayout.setVisibility(View.VISIBLE);
                }else {
                    operationLayout.setVisibility(View.GONE);
                }
            }
        });
        send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String content = editText.getText().toString();
                if (!TextUtils.isEmpty(content)){
                    addDanmaku(content,true);
                    editText.setText("");
                }
            }
        });
        getWindow().getDecorView().setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
            @Override
            public void onSystemUiVisibilityChange(int visibility) {
                if (visibility == View.SYSTEM_UI_FLAG_VISIBLE){
                    onWindowFocusChanged(true);
                }
            }
        });
    }
//随机生成一些弹幕消息
    private void generateSomeDanmaku(){
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (showDanmaku){
                    int time = new Random().nextInt(300);
                    String content = ""+time+time;
                    addDanmaku(content,false);
                    try {
                        Thread.sleep(time);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
    }

    /**
     * 向弹幕View中添加一条弹幕
     * @param content
     *   弹幕的具体内容
     * @param withBorder
     * DanmakuContext可以用于对弹幕的各种全局配置进行设定，如设置字体、设置最大显示行数等
     */
    private void addDanmaku(String content,boolean withBorder){
        BaseDanmaku danmaku = danmakuContext.mDanmakuFactory.createDanmaku(BaseDanmaku.TYPE_SCROLL_RL);
        danmaku.text = content;
        danmaku.padding = 5;
        danmaku.textSize = sp2px(20);
        danmaku.textColor= Color.WHITE;
        danmaku.setTime(danmakuView.getCurrentTime());
        if(withBorder){
            danmaku.borderColor = Color.GREEN;
        }
        danmakuView.addDanmaku(danmaku);
    }

    private int sp2px(float spValue) {
        final float fontScale = getResources().getDisplayMetrics().scaledDensity;
        return (int)(spValue * fontScale + 0.5f);
    }

    @Override
    protected void onPause() {
        super.onPause();
        if(danmakuView != null && danmakuView.isPrepared()){
            danmakuView.pause();
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        if(danmakuView != null && danmakuView.isPrepared() && danmakuView.isPaused()){
            danmakuView.resume();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        showDanmaku = false;
        if(danmakuView != null){
            danmakuView.release();
            danmakuView = null;
        }
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus && Build.VERSION.SDK_INT >= 19) {
            View decorView = getWindow().getDecorView();
            decorView.setSystemUiVisibility(
                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
            );
        }
    }


}

manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="demo.ligong.sdut.danmutest">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity" android:screenOrientation="landscape"
            android:configChanges="orientation|keyboardHidden|screenLayout|screenSize"
            >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

activity_main.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"
    android:background="#000">

    <VideoView
        android:id="@+id/video_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" />

    <master.flame.danmaku.ui.widget.DanmakuView
        android:id="@+id/danmaku_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <LinearLayout
        android:id="@+id/operation_layout"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:background="#fff"
        android:visibility="gone">

        <EditText
            android:id="@+id/edit_text"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1" />

        <Button
            android:id="@+id/send"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="Send" />
    </LinearLayout>
</RelativeLayout>