3.核心代码就要来了。在这里有几点是需要说明的。

(1)首先播放视频的话这里用到的是VideoView，使用起来也非常简单，先要设置一个视频文件的路径：String uri = “android.resource://” + getPackageName() + “/” + R.raw.danmu;然后调用start方法即可播放视频了。

(2)关于弹幕库的使用，可参考下面代码进行理解。我们需要创建一个DanmakuContext的实例和一个弹幕的解析器（这里直接创建了一个全局的BaseDanmakuParser），创建完成后就可以调用DanmakuView的prepare()方法了，调用这一方法后会自动调用回调函数中的prepared()方法，这个方法中调用了start方法，弹幕就此开始工作了。

(3)需要在onPause()、onResume()、onDestroy()方法中执行一些操作，以保证DanmakuView的资源可以得到释放。

(4)下面附上完整代码。

package com.mythmayor.a1805danmudemo;

import android.app.Activity;

import android.graphics.Color;

import android.os.Build;

import android.os.Bundle;

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 Activity {

private boolean showDanmaku;

private DanmakuView danmakuView;

private DanmakuContext danmakuContext;

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);

VideoView videoview = (VideoView) findViewById(R.id.video_view);

String uri = “android.resource://” + getPackageName() + “/” + R.raw.danmu;

videoview.setVideoPath(uri);

//videoview.setVideoURI(Uri.parse(uri));

videoview.start();

danmakuView = (DanmakuView) findViewById(R.id.danmaku_view);

danmakuView.enableDanmakuDrawingCache(true);

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() {

}

});

danmakuContext = DanmakuContext.create();

danmakuView.prepare(parser, danmakuContext);

final LinearLayout operationLayout = (LinearLayout) findViewById(R.id.operation_layout);

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, Color.GREEN);

editText.setText("");

}

}

});

getWindow().getDecorView().setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {

@Override

public void onSystemUiVisibilityChange(int visibility) {

if (visibility == View.SYSTEM_UI_FLAG_VISIBLE) {

onWindowFocusChanged(true);

}

}

});

}

/**

• 向弹幕View中添加一条弹幕

• @param content 弹幕的具体内容

• @param withBorder 弹幕是否有边框

*/

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);

}

/**

• 弹幕View中添加一条弹幕

• @param content 弹幕的具体内容

• @param withBorder 弹幕是否有边框

• @param textColor 弹幕字体颜色

*/

private void addDanmaku(String content, boolean withBorder, int textColor) {

BaseDanmaku danmaku = danmakuContext.mDanmakuFactory.createDanmaku(BaseDanmaku.TYPE_SCROLL_RL);

danmaku.text = content;

danmaku.padding = 5;

danmaku.textSize = sp2px(20);

danmaku.textColor = textColor;

danmaku.setTime(danmakuView.getCurrentTime());

if (withBorder) {

danmaku.borderColor = Color.GREEN;

}

danmakuView.addDanmaku(danmaku);

}

/**

• 随机生成一些弹幕内容以供测试

*/

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 (Exception e) {

e.printStackTrace();

}

}

}

}).start();

}

/**

• sp转px的方法。

*/

public 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();

showDanma

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ku = false;

if (danmakuView != null) {

danmakuView.release();

danmakuView = null;

}

}

/**

• 沉浸式状态栏效果

*/

@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_LAYOUT_HIDE_NAVIGATION

| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN

| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION

| View.SYSTEM_UI_FLAG_FULLSCREEN

| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);

}
}
}