1. Introduce the common methods of MediaPlay class and SurfaceView:
Common methods of the MediaPlay class:
| Method name | function |
| void seDataSource(String path) | set data source (http/rtsp address) |
| void seDataSource(FileDescriptor fd,long offset,long length ) | Set data source |
| void seDataSource(Context context,Uri uri) | Set a Uri data source |
| static MediaPlayercreate(Context context,int resid) | Conveniently create MediaPlayer according to a given resource id Object method |
| static MediaPlayercreate(Context context,Uri uri,SurfaceHolder holder) | Create a MediaPlayer object according to a given URI |
| boolean isPlaying() | Determine whether MediaPlayer is playing |
| getCurrentPosition() | Get the current position Play position |
| getDuration() | Get the time of the file |
| isLooping(boolean b) | Whether to play in a loop |
| getVideoHeight(), getVideoWidth() | Get the width and height of the video |
| pause() | Pause |
| prepare() | Prepare (synchronous) |
| prepareAsync() | Prepare (asynchronous) |
| release() | Release the MediaPlayer object Related Resources |
| reset() | Reset the MediaPlayer object to the state it just created |
| seekTo(int seek) | Specify the playback position (time in milliseconds) |
| setAudioStreamType(int type) | Set the type of streaming media |
| setDisplay(SurfaceHolder sh) | Set SurfaceHolder to display multimedia |
| stop() | Stop playing |
| setVolume(float leftVolume,float rightVolume) | Set volume |
| setScreenOnWhilePlaying(boolean b) | Set whether to use SurfaceHolder to keep the screen displayed |
| start() | Start playing |
Monitoring method:
| setOnButteringUpdateListener | Internet streaming media buffer monitoring |
| setOnErrorListener | setting error Information monitoring |
| setOnVideoSizeChangedListener | Video size monitoring |
Common methods of the SurfaceView class:
| Construction method |
Function |
| purblic SurfaceView(Context context) | Create a SurfaceView object |
| purblic SurfaceView (Context context, AttributeSet attrs) | Create SurfaceView object |
| purblic SurfaceView(Context context, AttributeSet attrs, int defStyle) | Create a SurfaceView object |
| Common methods | Function |
| public SurfaceHolder getHolder() | Get the SurfaceHolder object to manage surfaceview |
| public void setVisibility(int visibility) | Set whether it is visible |
SurfaceHolder is an interface, similar to a Surface listener. There are three callback methods to monitor the creation, destruction and change of Surface.
@Override
public void surfaceCreated(@NonNull SurfaceHolder holder) {
// create
}
@Override
public void surfaceChanged(@NonNull SurfaceHolder holder, int format, int width, int height) {
// Change
}
@Override
public void surfaceDestroyed(@NonNull SurfaceHolder holder) {
// destroy
}
2. Example:
MainActivity:
package com.example.surfaceview;
import static android.view.View.INVISIBLE;
import static android.view.View.VISIBLE;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.ContentResolver;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.SeekBar;
import android.widget.Toast;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends AppCompatActivity implements SeekBar.OnSeekBarChangeListener,SurfaceHolder.Callback, View.OnClickListener {
private SurfaceView sv;
private SurfaceHolder mHolder;
private MediaPlayer mPlayer;
private RelativeLayout rl;
private Timer mTimer;
private TimerTask mTimerTask;
private SeekBar sbar;
private ImageView play, forward, backward, loop;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R. layout. activity_main);
initView();
mTimer = new Timer();
// The task of the timer:
mTimerTask = new TimerTask() {
@Override
public void run() {
if (mPlayer!=null & &mPlayer.isPlaying()){
// Get the length of the video and set the maximum value of the progress bar
int total = mPlayer. getDuration();
sbar.setMax(total);
// get the current position
int progress = mPlayer. getCurrentPosition();
sbar.setProgress(progress);
}
}
};
// start the timer
mTimer.schedule(mTimerTask,500,500);
}
private void initView() {
sv = findViewById(R.id.sv);
loop = findViewById(R.id.loop_Im);
loop.setOnClickListener(this);
forward = findViewById(R.id.backward_Im);
forward.setOnClickListener(this);
backward = findViewById(R.id.forward_Im);
backward. setOnClickListener(this);
// Get the SurfaceHolder object for managing SurfaceView
mHolder = sv. getHolder();
mHolder. setType(3);
mHolder. addCallback(this);
rl = findViewById(R.id.rl);
play = findViewById(R.id.play);
play.setOnClickListener(this);
sbar = findViewById(R.id.sbar);
sbar.setOnSeekBarChangeListener(this);
}
@Override
public void surfaceCreated(@NonNull SurfaceHolder holder) {
mPlayer = new MediaPlayer();
mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
Uri uri = Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE + "://" +
getPackageName() + "/" + R.raw.video);
try {
// set the data source
mPlayer.setDataSource(MainActivity.this,uri);
// surfaceView is associated with MediaPlay
mPlayer.setDisplay(mHolder);
mPlayer.prepareAsync(); // Prepare to play (asynchronous)
mPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mPlayer.start();
}
});
}catch (Exception e){
Toast.makeText(MainActivity.this,"Play failed!",Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
@Override
public void surfaceChanged(@NonNull SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(@NonNull SurfaceHolder holder) {
if (mPlayer!=null)
mPlayer. stop();
}
/
// When the progress of the progress bar changes
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (seekBar. getProgress()==seekBar. getMax()){
play.setBackgroundResource(R.drawable.stop);
}
}
// Triggered when the progress bar is dragged
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
// Triggered when the progress bar stops dragging
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
int position = seekBar. getProgress();
if (mPlayer!=null){
mPlayer. seekTo(position);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event. getAction()){
case MotionEvent. ACTION_DOWN:
if (rl. getVisibility() == INVISIBLE) {
rl. setVisibility(VISIBLE);
CountDownTimer cdt = new CountDownTimer(3000, 1000) {
@Override
public void onTick(long millisUntilFinished) {
System.out.println(millisUntilFinished);
}
@Override
public void onFinish() {
// hide progress bar and play button
rl. setVisibility(INVISIBLE);
}
};
cdt.start();
}else if(rl. getVisibility() == VISIBLE){
rl. setVisibility(INVISIBLE);
}
break;
}
return super.onTouchEvent(event);
}
@Override
protected void onDestroy() {
// Release resources
mTimerTask. cancel();
mTimer. cancel();
mTimer = null;
mTimerTask = null;
mPlayer. release();
mPlayer=null;
super. onDestroy();
}
@Override
public void onClick(View v) {
switch (v. getId()){
case R.id.backward_Im:
int bPosition = mPlayer.getCurrentPosition()-100;
mPlayer.seekTo(bPosition);
sbar.setProgress(bPosition);
break;
case R.id.forward_Im:
int fPosition = mPlayer.getCurrentPosition() + 200;
mPlayer.seekTo(fPosition);
sbar.setProgress(fPosition);
break;
case R.id.loop_Im:
if (mPlayer.isPlaying()){
loop.setBackgroundResource(R.drawable.floooping);
Toast.makeText(this, "1111", Toast.LENGTH_SHORT).show();
mPlayer. setLooping(false);
} else {
loop.setBackgroundResource(R.drawable.tlooping);
Toast.makeText(this, "1222", Toast.LENGTH_SHORT).show();
mPlayer. setLooping(true);
}
break;
case R.id.play:
if (mPlayer!=null & &mPlayer.isPlaying()){
mPlayer. pause();
play.setImageResource(R.drawable.stop);
} else {
mPlayer.start();
play.setImageResource(R.drawable.start);
}
break;
}
}
}
activity_main:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<SurfaceView
android:id="@ + id/sv"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<RelativeLayout
android:id="@ + id/rl"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<SeekBar
android:id="@ + id/sbar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:max="100"
android:progress="0" />
<ImageView
android:id="@ + id/play"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:background="@drawable/start" />
<ImageView
android:id="@ + id/backward_Im"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:layout_toLeftOf="@ + id/play"
android:background="@drawable/backward" />
<ImageView
android:id="@ + id/forward_Im"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_toRightOf="@ + id/play"
android:layout_centerInParent="true"
android:background="@drawable/forward" />
<ImageView
android:id="@ + id/loop_Im"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_below="@ + id/forward_Im"
android:layout_centerInParent="true"
android:background="@drawable/floooping" />
</RelativeLayout>
</FrameLayout>