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本篇文章為大家展示了怎么使用SurfaceView播放視頻發送彈幕，內容簡明扼要并且容易理解，絕對能使你眼前一亮，通過這篇文章的詳細介紹希望你能有所收獲。
SurfaceView使用步驟
使用SurfaceView的步驟：
首先要繼承SurfaceView，實現SurfaceHolder.Callback接口。
重寫方法：surfaceChanged：surface大小或格式發生變化時觸發，在surfaceCreated調用后該函數至少會被調用一次。
surfaceCreated：Surface創建時觸發，一般在這個函數開啟繪圖線程（新的線程，不要再這個線程中繪制Surface）。
surfaceDestroyed：銷毀時觸發，一般不可見時就會銷毀。
利用getHolder()獲取SurfaceHolder對象，調用SurfaceHolder.addCallback添加回調
SurfaceHolder.lockCanvas 獲取Canvas對象并鎖定畫布，調用Canvas繪圖，SurfaceHolder.unlockCanvasAndPost 結束鎖定畫布，提交改變。
SurfaceHolder
SurfaceHolder回調自己的三個生命周期：
surfaceCreated(SurfaceHolder holder)創建時
surfaceChanged(SurfaceHolder holder, int format, int width, int height)改變時
surfaceDestroyed(SurfaceHolder holder)銷毀時
SurfaceView播放視頻并可以發送彈幕
需要準備兩個SurfaceView，一個是負責播放視頻，一個負責展示彈幕。彈幕是展示在視頻上面的，所以我們要給展示彈幕的SurfaceView設置兩個方法：
surfaceView_danmu.setZOrderOnTop(true); ——置于上方
surfaceView_danmuHolder.setFormat(PixelFormat.TRANSPARENT); ——背景透明
public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {
public static final int PROGRESS = 101;
SurfaceView surfaceView,surfaceView_danmu;
SurfaceHolder surfaceHolder,surfaceView_danmuHolder;
MediaPlayer mediaPlayer = new MediaPlayer();
String path = "/sdcard/aa.mp4";
SeekBar seekBar;
Timer timer;
EditText editText;
Button button,bt_start,bt_stop;
int x = 0;
ArrayList<DanMu> list = new ArrayList<>();
Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == PROGRESS){
seekBar.setProgress((Integer) msg.obj);
mediaPlayer.setOnSeekCompleteListener(new MediaPlayer.OnSeekCompleteListener() {
@Override
public void onSeekComplete(MediaPlayer mp) {
Toast.makeText(MainActivity.this, "播放完畢！", Toast.LENGTH_SHORT).show();
}
});
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
surfaceView = findViewById(R.id.sufaceview);
surfaceView_danmu = findViewById(R.id.sufaceview_danmu);
editText = findViewById(R.id.et);
button = findViewById(R.id.bt_send);
seekBar = findViewById(R.id.bar);
bt_start = findViewById(R.id.bt_start);
bt_stop = findViewById(R.id.bt_stop);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceView_danmuHolder = surfaceView_danmu.getHolder();
surfaceView_danmuHolder.addCallback(this);
surfaceView_danmu.setZOrderOnTop(true);
surfaceView_danmuHolder.setFormat(PixelFormat.TRANSPARENT);
if (mediaPlayer!=null) {
try {
mediaPlayer.setDataSource(path);
mediaPlayer.prepareAsync();
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
int duration = mediaPlayer.getDuration();
seekBar.setMax(duration);
timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
int currentPosition = mediaPlayer.getCurrentPosition();
Message message = Message.obtain();
message.what = PROGRESS;
message.obj = currentPosition;
handler.sendMessage(message);
}
},0,1000);
}
});
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
int progress = seekBar.getProgress();
mediaPlayer.seekTo(progress);
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String s = editText.getText().toString();
int y= (int) (Math.random()*300);
list.add(new DanMu(0,y,s,Color.RED));
}
});
bt_start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mediaPlayer.start();
}
});
bt_stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mediaPlayer.pause();
}
});
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (holder == surfaceHolder) {
mediaPlayer.setDisplay(holder);
}else if (holder == surfaceView_danmuHolder) {
new MyDanMuThread().start();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
class MyDanMuThread extends Thread {
@Override
public void run() {
super.run();
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setTextSize(40);
while (true) {
try {
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
Canvas canvas = surfaceView_danmuHolder.lockCanvas();
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
for (int i=0;i<list.size();i++) {
DanMu danMu = list.get(i);
x = danMu.getX();
danMu.setX(x+=10);
canvas.drawText(danMu.getText(),danMu.getX(),danMu.getY(),paint);
}
surfaceView_danmuHolder.unlockCanvasAndPost(canvas);
}
}
}
}實現滾動歌詞
要準備一個裝有時間和歌詞的集合，準備一個Timer計時器和一個該展示第幾個歌詞。每隔一秒去拿該歌詞的下一個歌詞時間與進度匹配，如果進度>=該時間，那么就畫該歌詞在SurfaceView上；<則不畫該歌詞
一定要寫SD卡讀寫權限！！！！！
public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback{
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
MediaPlayer mediaPlayer = new MediaPlayer();
ArrayList<Music> list=new ArrayList<>();
Timer timer;
int count = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
surfaceView = findViewById(R.id.sv);
surfaceHolder=surfaceView.getHolder();
surfaceHolder.addCallback(this);
timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
int currentPosition = mediaPlayer.getCurrentPosition();
if(list.size()>0){
if(currentPosition>=list.get(count+1).getTime()){
count++;
}
}
}
},0,500);
try {
mediaPlayer.setDataSource("/sdcard/鳳凰傳奇 - 最炫民族風(Live).mp3");
mediaPlayer.prepareAsync();
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
}
});
} catch (IOException e) {
e.printStackTrace();
}
try {
StringBuffer stringBuffer = new StringBuffer();
FileInputStream fileInputStream = new FileInputStream("/sdcard/最炫民族風");
byte[] bytes = new byte[1024];
int len = 0;
while ((len=fileInputStream.read(bytes))!=-1) {
stringBuffer.append(new String(bytes,0,len));
}
Gson gson = new Gson();
JavaBean javaBean = gson.fromJson(stringBuffer.toString(), JavaBean.class);
JavaBean.LrcBean lrc = javaBean.getLrc();
String lyric = lrc.getLyric();
String[] split = lyric.split("\n");
for(int i=0;i<split.length;i++){
String trim = split[i].trim();
String[] split1 = trim.split("]");
if(split.length>=2){
String s = split1[0];
String substring1 = s.substring(1, 3);
String substring2 = s.substring(4, 6);
String substring3 = s.substring(7, 10);
long start = Integer.parseInt(substring1)*60*1000+Integer.parseInt(substring2)*1000+Integer.parseInt(substring3);
String text = split1[1];
list.add(new Music(text,start));
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
new MyThread().start();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
class MyThread extends Thread {
@Override
public void run() {
super.run();
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setTextSize(50);
while (true){
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
Canvas canvas = surfaceHolder.lockCanvas();
if(canvas==null){
break;
}
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
if(list.size()>0){
canvas.drawText(list.get(count).getTitle(),100,100,paint);
}
surfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
}上述內容就是怎么使用SurfaceView播放視頻發送彈幕，你們學到知識或技能了嗎？如果還想學到更多技能或者豐富自己的知識儲備，歡迎關注億速云行業資訊頻道。
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