下面就來演示一個簡單的播放例子：
AndroidManifest.xml ：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.gjun.mediaplayerpractice" >
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
MainActivity ：
package com.example.gjun.mediaplayerpractice;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.SeekBar;
import android.widget.Toast;
import java.io.IOException;
public class MainActivity extends ActionBarActivity {
private SeekBar control;
private MediaPlayer mediaPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//取得元件
control = (SeekBar) findViewById(R.id.control);
// 註冊SeekBar元件進度改變事件
control.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
// 一定要判斷是使用者的操作，因為播放過程也會更改進度
if (fromUser) {
// 移動音樂到指定的進度
mediaPlayer.seekTo(progress);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
public void clickPlay(View view) {
// 開始播放
if (mediaPlayer != null){
mediaPlayer.start();
// 執行顯示播放進度的AsyncTask物件
new MyPlayTask().execute();
}else if (!mediaPlayer.isPlaying()){
new NetworkTask().execute("http://www.ntust20140311ai2.comuv.com/song01.mp3");
}
}
public void clickPause(View view) {
// 暫停播放
if (mediaPlayer != null && mediaPlayer.isPlaying()){
mediaPlayer.pause();
}
}
public void clickStop(View view) {
// 停止播放
if (mediaPlayer != null){
mediaPlayer.stop();
// 回到開始的位置
mediaPlayer.seekTo(0);
control.setProgress(0);
}
}
// 從指定的網路資源載入音樂並開始播放
private class NetworkTask extends AsyncTask<String, Void, Void> {
@Override
protected Void doInBackground(String... networkPah) {
// 建立網路資源音樂檔案Uri物件
Uri uri = Uri.parse(networkPah[0]);
mediaPlayer = MediaPlayer.create(MainActivity.this,uri);
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
control.setMax(mediaPlayer.getDuration());
// 註冊播放完畢監聽事件
// 切換按鈕為可播放
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
clickStop(null);
Toast.makeText(MainActivity.this, "Play End!",Toast.LENGTH_SHORT).show();
}
});
// 開始播放
mediaPlayer.start();
Toast.makeText(MainActivity.this,"Play Start!",Toast.LENGTH_SHORT).show();
}
}
// 在播放過程中顯示播放進度
private class MyPlayTask extends AsyncTask<Void, Integer, Void> {
@Override
protected Void doInBackground(Void... voids) {
while (mediaPlayer.isPlaying()){
this.publishProgress(mediaPlayer.getCurrentPosition());
}
return null;
}
// 設定播放進度
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
control.setProgress(progress[0]);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
activity_main.xml ：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/retangle_drawable"
android:layout_margin="6sp"
android:padding="6sp" >
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/play_icon"
android:onClick="clickPlay" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/pause_icon"
android:onClick="clickPause" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/stop_icon"
android:onClick="clickStop" />
<SeekBar
android:id="@+id/control"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/retangle_drawable"
android:layout_margin="6sp"
android:padding="6sp" >
<ImageButton
android:id="@+id/record_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/record_dark_icon"
android:onClick="clickRecord" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/play_icon"
android:onClick="clickRecordPlay" />
<ProgressBar
android:id="@+id/record_volumn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="6dp"
android:layout_marginRight="6dp"
android:max="15"
style="@android:style/Widget.ProgressBar.Horizontal" />
</LinearLayout>
</LinearLayout>
源碼下載：
MediaPlayerPractice.7z
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