public class Main_activity extends AppCompatActivity {
private ImageButton button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button=(ImageButton) findViewById(R.id.imageButton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(Main_activity.this,MyListView.class);
startActivity(intent);
}
});
}
}
public class MyListView extends AppCompatActivity {
private ListView listView;
private List<String> data = new ArrayList<String>();
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
listView = new ListView(this);
data=getData();
listView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1,data));
setContentView(listView);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent=new Intent(MyListView.this,Surfaceview.class);
intent.putExtra("datap",data.get(position));
startActivity(intent);
finish();
}
});
}
private List<String> getData(){
List<String> data = new ArrayList<String>();
ContentResolver c=getContentResolver();
Cursor cur = c.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null,
null, null,null);
int num=cur.getCount();
cur.moveToFirst();
for (int i=0;i<num;i++){
String datapath=cur.getString(cur.getColumnIndex(MediaStore.Video.Media.DATA));
data.add(datapath);
cur.moveToNext();
}
return data;
}
}
public class Surfaceview extends AppCompatActivity {
MediaPlayer mp;
SurfaceView sv;
Handler mHandler;
Runnable mRunnable;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.surfacexml);
Intent intent=this.getIntent();
final String datapath=intent.getStringExtra("datap");
sv=(SurfaceView)findViewById(R.id.surfaceView2);
final LinearLayout linearLayout=(LinearLayout)findViewById(R.id.test);
mp=new MediaPlayer();
final Button bplay=(Button)findViewById(R.id.play);
Button bbefore=(Button)findViewById(R.id.before);
Button bnext=(Button)findViewById(R.id.next);
final SeekBar seekbar=(SeekBar)findViewById(R.id.seekbar);
sv.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
mHandler.removeCallbacks(mRunnable);
linearLayout.setVisibility(View.VISIBLE);
mHandler.postDelayed(mRunnable,4000);
return false;
}
});
mHandler= new Handler();
mRunnable = new Runnable() {
@Override
public void run() {
linearLayout.setVisibility(View.INVISIBLE);
}
};
try {
mp.setDataSource(datapath);
} catch (IOException e) {
e.printStackTrace();
}
mp.setDisplay(sv.getHolder());
try {
mp.prepare();
} catch (IOException e) {
e.printStackTrace();
}
mp.start();
Timer timer=new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
float x=mp.getDuration();
float i=mp.getCurrentPosition();
float p=i/x*100;
int g=(int)p;
seekbar.setProgress(g);
}
},0, 500);
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) {
float x=seekBar.getProgress();
float a=mp.getDuration();
float i=x/100*a;
int j=(int)i;
mp.pause();
mp.seekTo(j);
mp.start();
}
});
bplay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mp.isPlaying()) {
mp.pause();
bplay.setText("play"); }
else {
mp.start();
bplay.setText("pause");
}
}
});
}
}
以上是3个主类，我的思路是主页面一个按钮，然后点击就进入MyListView，就是用list类现实本机里所有视频文件，然后点击一个item，在进入Surfaceview，这是主播放的界面，但是前面都还好，就是最后这个surface进不去，我在努力思考原因，各种调试，但是还是没找出原因，错误如下：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: yuyu.mymedia, PID: 2524
java.lang.RuntimeException: Unable to start activity ComponentInfo{yuyu.mymedia/yuyu.mymedia.Surfaceview}: java.lang.IllegalArgumentException: The surface has been released
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2947)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3008)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1650)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6688)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
Caused by: java.lang.IllegalArgumentException: The surface has been released
at android.media.MediaPlayer._setVideoSurface(Native Method)
at android.media.MediaPlayer.setDisplay(MediaPlayer.java:795)
at yuyu.mymedia.Surfaceview.onCreate(Surfaceview.java:66)
at android.app.Activity.performCreate(Activity.java:6912)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1126)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2900)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3008)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1650)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6688)
然后调试的时候，当运行到sv.setOnTouchListener(new View.OnTouchListener()这句以及后面的mp,handle等，会出现没有sv,mp,这些的实例，十分不理解，怎么会没有实例？
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