Android入门：简单视频进度条_videoview自定义进度条

        继续学习Android，使用监听和消息处理来实现一个简单的视频进度条。

一、效果预览

二、布局

        使用VideoView播放视频，在VideoView底部添加播放进度条，进度条左右分别显示当前播放时间和视频总时间。

<?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="wrap_content">
 
    <VideoView
        android:id="@+id/video"
        android:layout_width="match_parent"
        android:layout_height="100pt"
        android:keepScreenOn="true" />
 
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_alignBottom="@+id/video">
 
        <TextView
            android:id="@+id/leftTime"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textColor="#B1AFAF"
            android:layout_weight="2"/>
 
        <SeekBar
            android:id="@+id/seekbar"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="8"/>
 
        <TextView
            android:id="@+id/rightTime"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textColor="#B1AFAF"
            android:layout_weight="2"/>
    </LinearLayout>
    
</RelativeLayout>

三、实现

        VideoView可以通过getDuration方法获取视频总长度，调用seekbar.setMax将视频长度与进度条长度同步；设置了总长度后，我们还需要在改变当前进度条进度时，同时改变视频的播放进度，SeekBar可以设置一个监听器，我们需要在进度改变时执行相应的操作。

        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                handler.removeMessages(1);
                if(b) {
                    videoView.seekTo(i);
                }
                Message message = Message.obtain();
                message.arg1 = videoView.getDuration();
                message.arg2 = videoView.getCurrentPosition();
                message.what=1;
                //handler.sendMessageDelayed(message,100);
                handler.sendMessage(message);
            }
 
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
 
            }
 
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
 
            }
        });

        这里使用发送消息来同步时间，各个组件的监听中只需要负责发送需要改变的时间和总时间，消息处理中会执行我们定义的方法来更改对应的UI。

四、全部代码

        makeTimeString()：实现了对总时间的格式转换，用于显示当前播放时间和总时间。

public class VideoActivity extends AppCompatActivity {
 
    private VideoView videoView;
    private SeekBar seekBar;
    private TextView leftTime;
    private TextView rightTime;
 
    @SuppressLint("HandlerLeak")
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
 
            switch (msg.what){
                case 1:
                    int allLength = msg.arg1;
                    int currentPosition = msg.arg2;
 
                    leftTime.setText(makeTimeString(currentPosition));
                    rightTime.setText(makeTimeString(allLength));
                    seekBar.setProgress(currentPosition);
 
                    msg = Message.obtain();
                    msg.arg1 = videoView.getDuration();
                    msg.arg2 = videoView.getCurrentPosition();
                    msg.what = 1;
                    if(videoView.isPlaying()){
                        handler.sendMessageDelayed(msg,100);
                    }
                    break;
            }
        }
    };
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_video);
 
        seekBar=findViewById(R.id.seekbar);
        leftTime=findViewById(R.id.leftTime);
        rightTime=findViewById(R.id.rightTime);
        videoView=findViewById(R.id.video);
 
        //String videoPath = "https:vfx.mtime.cn/Video/2019/07/12/mp4/190712140656051701.mp4";
        //videoView.setVideoPath(videoPath);
        Uri uri = Uri.parse("android.resource://"+getPackageName()+"/"+R.raw.video);
 
        videoView.setVideoURI(uri);
        videoView.start();
        videoView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(videoView.isPlaying())
                    videoView.pause();
                else {
                    handler.removeMessages(1);
                    videoView.start();
 
                    Message message = Message.obtain();
                    message.arg1 = videoView.getDuration();
                    message.arg2 = videoView.getCurrentPosition();
                    message.what=1;
                    handler.sendMessageDelayed(message,100);
                }
            }
        });
 
        videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mediaPlayer) {
                seekBar.setMax(videoView.getDuration());
 
                Message message = Message.obtain();
                message.arg1 = videoView.getDuration();
                message.arg2 = videoView.getCurrentPosition();
                message.what=1;
                handler.sendMessageDelayed(message,100);
            }
        });
 
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                handler.removeMessages(1);
                if(b) {
                    videoView.seekTo(i);
                }
                Message message = Message.obtain();
                message.arg1 = videoView.getDuration();
                message.arg2 = videoView.getCurrentPosition();
                message.what=1;
                //handler.sendMessageDelayed(message,100);
                handler.sendMessage(message);
            }
 
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
 
            }
 
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
 
            }
        });
    }
 
    //时间转换成字符串，用于显示当前播放时间和总时间
    private String makeTimeString(int secs) {
        String durationFormat = "%1$02d:%2$02d:%3$02d";
        StringBuilder sFormatBuilder = new StringBuilder();
        Formatter sFormatter = new Formatter(sFormatBuilder, Locale.getDefault());
        sFormatBuilder.setLength(0);
        secs = secs / 1000;
        Object[] timeArgs = new Object[3];
        timeArgs[0] = secs / 3600;
        timeArgs[1] = (secs % 3600) / 60;
        timeArgs[2] = (secs % 3600 % 60) % 60;
        return sFormatter.format(durationFormat,timeArgs).toString().trim();
    }
}