【移动应用开发技术】怎么使用SurfaceView播放视频发送弹幕

【移动应用开发技术】怎么使用SurfaceView播放视频发送弹幕

本篇文章为大家展示了怎么使用SurfaceView播放视频发送弹幕，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。SurfaceView使用步骤使用SurfaceView的步骤：首先要继承SurfaceView，实现SurfaceHolder.Callback接口。重写方法：surfaceChanged：surface大小或格式发生变化时触发，在surfaceCreated调用后该函数至少会被调用一次。surfaceCreated：Surface创建时触发，一般在这个函数开启绘图线程（新的线程，不要再这个线程中绘制Surface）。surfaceDestroyed：销毁时触发，一般不可见时就会销毁。利用getHolder()获取SurfaceHolder对象，调用SurfaceHolder.addCallback添加回调SurfaceHolder.lockCanvas获取Canvas对象并锁定画布，调用Canvas绘图，SurfaceHolder.unlockCanvasAndPost结束锁定画布，提交改变。SurfaceHolderSurfaceHolder回调自己的三个生命周期：surfaceCreated(SurfaceHolderholder)创建时surfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight)改变时surfaceDestroyed(SurfaceHolderholder)销毁时SurfaceView播放视频并可以发送弹幕需要准备两个SurfaceView，一个是负责播放视频，一个负责展示弹幕。弹幕是展示在视频上面的，所以我们要给展示弹幕的SurfaceView设置两个方法：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,

"播放完毕！",

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);

}

}

}

}实现滚动歌词要准备一个装有时间和歌词的集合，准备一个Timer计时器和一个该展示第几个歌词。每隔一秒去拿该歌词的下一个歌词时间与进度匹配，如果进度>=该时间，那么就画该歌词在SurfaceView上；<则不画该歌词一定要写SD卡读写权限！！！！！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/凤凰传奇

-

最炫民族风(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/最炫民族风");

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

publ