MainActivity.java
package com.ct13;
import java.io.File;
import java.io.IOException;
import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener {
private Button btn_play, btn_pause, btn_stop, btn_hight, btn_low;
private SurfaceView surfaceView;
protected AudioManager audioManager;
private MediaPlayer mediaPlayer;
protected static int position = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setWindow();
setContentView(R.layout.activity_main);
findViews();
setListeners();
audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
mediaPlayer = new MediaPlayer();
setSurfaceView();
}
private void setWindow() {
// TODO Auto-generated method stub
requestWindowFeature(Window.FEATURE_NO_TITLE);
MainActivity.this.getWindow().setFlags(
WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
}
private void findViews() {
// TODO Auto-generated method stub
btn_play = (Button) this.findViewById(R.id.btn_play);
btn_pause = (Button) this.findViewById(R.id.btn_pause);
btn_stop = (Button) this.findViewById(R.id.btn_stop);
btn_hight = (Button) this.findViewById(R.id.btn_hight);
btn_low = (Button) this.findViewById(R.id.btn_low);
surfaceView = (SurfaceView)findViewById(R.id.surface);
}
private void setListeners() {
// TODO Auto-generated method stub
btn_play.setOnClickListener(this);
btn_pause.setOnClickListener(this);
btn_stop.setOnClickListener(this);
btn_hight.setOnClickListener(this);
btn_low.setOnClickListener(this);
}
private void setSurfaceView() {
// TODO Auto-generated method stub
surfaceView.getHolder().setFixedSize(320, 320);
surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
surfaceView.getHolder().addCallback(new SurceCallBack());
}
private boolean isPlaying() {
return mediaPlayer != null && mediaPlayer.isPlaying();
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_play:
if (isPlaying()) {
return;
} else {
playMedia();
}
break;
case R.id.btn_pause:
if (isPlaying()) {
position = mediaPlayer.getCurrentPosition();
mediaPlayer.pause();
}
break;
case R.id.btn_stop:
if (isPlaying()) {
mediaPlayer.stop();
position = 0;
} else {
return;
}
break;
case R.id.btn_hight:
int volume2 = audioManager
.getStreamVolume(AudioManager.STREAM_MUSIC);
if (volume2 > 0) {
audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_RAISE, 0);
} else {
return;
}
break;
case R.id.btn_low:
int volume = audioManager
.getStreamVolume(AudioManager.STREAM_MUSIC);
if (volume > 0) {
audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_LOWER, 0);
} else {
return;
}
break;
default:
break;
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
// TODO Auto-generated method stub
super.onSaveInstanceState(outState);
if (mediaPlayer != null && mediaPlayer.isPlaying()) {
outState.putInt("position", mediaPlayer.getCurrentPosition());
}
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onRestoreInstanceState(savedInstanceState);
if (savedInstanceState.containsKey("position")) {
position = savedInstanceState.getInt("position");
}
}
// 视频播放
private void playMedia() {
try {
File file = new File(Environment.getExternalStorageDirectory(),
"can_you_feel_my_world.mp4");
mediaPlayer.reset();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(file.getAbsolutePath());
mediaPlayer.setDisplay(surfaceView.getHolder());
mediaPlayer.prepare();
mediaPlayer.start();
mediaPlayer.seekTo(position);
position = 0;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private class SurceCallBack implements SurfaceHolder.Callback {
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
if (position > 0) {
try {
playMedia();
position = 0;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
}
mediaPlayer.release();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<SurfaceView
android:id="@+id/surface"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_weight="0.15" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.85"
android:background="@android:color/background_dark"
android:orientation="horizontal" >
<Button
android:id="@+id/btn_play"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="开唱"
android:textSize="12dp" />
<Button
android:id="@+id/btn_pause"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="暂停"
android:textSize="12dp" />
<Button
android:id="@+id/btn_stop"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="停止"
android:textSize="12dp" />
<Button
android:id="@+id/btn_low"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.9"
android:text="调低音量"
android:textSize="10dp" />
<Button
android:id="@+id/btn_hight"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.9"
android:text="调高音量"
android:textSize="10dp" />
</LinearLayout>
</LinearLayout>
manifest.xml:
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
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