这是我的logcat
MediaPlayer(5424): Uri is content://media/external/audio/media/2325
MediaPlayer(5424): http youtube = false, scheme = content
MediaPlayer(5424): Uri is content://media/internal/audio/media/2325
MediaPlayer(5424): http youtube = false, scheme = content
MediaPlayer(5424): Couldn't open file on client side, trying server side
MediaPlayer(5424): attachNewPlayer called in state 2
MUSIC SERVICE(5424): Error setting data source
MUSIC SERVICE(5424): java.lang.IllegalStateException
MUSIC SERVICE(5424): at android.media.MediaPlayer._setDataSource(Native Method)
MUSIC SERVICE(5424): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:981)
MUSIC SERVICE(5424): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:966)
MUSIC SERVICE(5424): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:878)
MUSIC SERVICE(5424): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:812)
MUSIC SERVICE(5424): at com.playmusic.ghufron.MusicService.playSong(MusicService.java:109)
MUSIC SERVICE(5424): at com.playmusic.ghufron.MainActivity.songPicked(MainActivity.java:105)
MUSIC SERVICE(5424): at java.lang.reflect.Method.invokeNative(Native Method)
MUSIC SERVICE(5424): at java.lang.reflect.Method.invoke(Method.java:511)
MUSIC SERVICE(5424): at android.view.View$1.onClick(View.java:3052)
MUSIC SERVICE(5424): at android.view.View.performClick(View.java:3528)
MUSIC SERVICE(5424): at android.view.View$PerformClick.run(View.java:14235)
MUSIC SERVICE(5424): at android.os.Handler.handleCallback(Handler.java:605)
MUSIC SERVICE(5424): at android.os.Handler.dispatchMessage(Handler.java:92)
MUSIC SERVICE(5424): at android.os.Looper.loop(Looper.java:137)
MUSIC SERVICE(5424): at android.app.ActivityThread.main(ActivityThread.java:4424)
MUSIC SERVICE(5424): at java.lang.reflect.Method.invokeNative(Native Method)
MUSIC SERVICE(5424): at java.lang.reflect.Method.invoke(Method.java:511)
MUSIC SERVICE(5424): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:817)
MUSIC SERVICE(5424): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
MUSIC SERVICE(5424): at dalvik.system.NativeStart.main(Native Method)
dalvikvm(5424): threadid=1: thread exiting with uncaught exception (group=0x40af89f0)
AndroidRuntime(5424): FATAL EXCEPTION: main
AndroidRuntime(5424): java.lang.NoSuchMethodError: android.app.Notification$Builder.build
AndroidRuntime(5424): at com.playmusic.ghufron.MusicService.onPrepared(MusicService.java:156)
AndroidRuntime(5424): at android.media.MediaPlayer$EventHandler.handleMessage(MediaPlayer.java:1758)
AndroidRuntime(5424): at android.os.Handler.dispatchMessage(Handler.java:99)
AndroidRuntime(5424): at android.os.Looper.loop(Looper.java:137)
AndroidRuntime(5424): at android.app.ActivityThread.main(ActivityThread.java:4424)
AndroidRuntime(5424): at java.lang.reflect.Method.invokeNative(Native Method)
AndroidRuntime(5424): at java.lang.reflect.Method.invoke(Method.java:511)
AndroidRuntime(5424): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:817)
AndroidRuntime(5424): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
AndroidRuntime(5424): at dalvik.system.NativeStart.main(Native Method)
dalvikvm(5653): VFY: unable to resolve virtual method 163: Landroid/app/Notification$Builder;.build ()Landroid/app/Notification;
这里是我的主要活动java
package com.playmusic.ghufron;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import com.playmusic.ghufron.MusicService.MusicBinder;
import android.net.Uri;
import android.os.Bundle;
import android.os.IBinder;
import android.app.Activity;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.database.Cursor;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.MediaController.MediaPlayerControl;
public class MainActivity extends Activity implements MediaPlayerControl {
//song list variables
private ArrayList<Song> songList;
private ListView songView;
//service
private MusicService musicSrv;
private Intent playIntent;
//binding
private boolean musicBound=false;
//controller
private MusicController controller;
//activity and playback pause flags
private boolean paused=false, playbackPaused=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//retrieve list view
songView = (ListView)findViewById(R.id.song_list);
//instantiate list
songList = new ArrayList<Song>();
//get songs from device
getSongList();
//sort alphabetically by title
Collections.sort(songList, new Comparator<Song>(){
public int compare(Song a, Song b){
return a.getTitle().compareTo(b.getTitle());
}
});
//create and set adapter
SongAdapter songAdt = new SongAdapter(this, songList);
songView.setAdapter(songAdt);
//setup controller
setController();
}
//connect to the service
private ServiceConnection musicConnection = new ServiceConnection(){
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
MusicBinder binder = (MusicBinder)service;
//get service
musicSrv = binder.getService();
//pass list
musicSrv.setList(songList);
musicBound = true;
}
@Override
public void onServiceDisconnected(ComponentName name) {
musicBound = false;
}
};
//start and bind the service when the activity starts
@Override
protected void onStart() {
super.onStart();
if(playIntent==null){
playIntent = new Intent(this, MusicService.class);
bindService(playIntent, musicConnection, Context.BIND_AUTO_CREATE);
startService(playIntent);
}
}
//user song select
public void songPicked(View view){
musicSrv.setSong(Integer.parseInt(view.getTag().toString()));
musicSrv.playSong();
if(playbackPaused){
setController();
playbackPaused=false;
}
controller.show(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.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
//menu item selected
switch (item.getItemId()) {
case R.id.action_shuffle:
musicSrv.setShuffle();
break;
case R.id.action_end:
stopService(playIntent);
musicSrv=null;
System.exit(0);
break;
}
return super.onOptionsItemSelected(item);
}
//method to retrieve song info from device
public void getSongList(){
//query external audio
ContentResolver musicResolver = getContentResolver();
Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Cursor musicCursor = musicResolver.query(musicUri, null, null, null, null);
//iterate over results if valid
if(musicCursor!=null && musicCursor.moveToFirst()){
//get columns
int titleColumn = musicCursor.getColumnIndex
(android.provider.MediaStore.Audio.Media.TITLE);
int idColumn = musicCursor.getColumnIndex
(android.provider.MediaStore.Audio.Media._ID);
int artistColumn = musicCursor.getColumnIndex
(android.provider.MediaStore.Audio.Media.ARTIST);
//add songs to list
do {
long thisId = musicCursor.getLong(idColumn);
String thisTitle = musicCursor.getString(titleColumn);
String thisArtist = musicCursor.getString(artistColumn);
songList.add(new Song(thisId, thisTitle, thisArtist));
}
while (musicCursor.moveToNext());
}
}
@Override
public boolean canPause() {
return true;
}
@Override
public boolean canSeekBackward() {
return true;
}
@Override
public boolean canSeekForward() {
return true;
}
@Override
public int getAudioSessionId() {
return 0;
}
@Override
public int getBufferPercentage() {
return 0;
}
@Override
public int getCurrentPosition() {
if(musicSrv!=null && musicBound && musicSrv.isPng())
return musicSrv.getPosn();
else return 0;
}
@Override
public int getDuration() {
if(musicSrv!=null && musicBound && musicSrv.isPng())
return musicSrv.getDur();
else return 0;
}
@Override
public boolean isPlaying() {
if(musicSrv!=null && musicBound)
return musicSrv.isPng();
return false;
}
@Override
public void pause() {
playbackPaused=true;
musicSrv.pausePlayer();
}
@Override
public void seekTo(int pos) {
musicSrv.seek(pos);
}
@Override
public void start() {
musicSrv.go();
}
//set the controller up
private void setController(){
controller = new MusicController(this);
//set previous and next button listeners
controller.setPrevNextListeners(new View.OnClickListener() {
@Override
public void onClick(View v) {
playNext();
}
}, new View.OnClickListener() {
@Override
public void onClick(View v) {
playPrev();
}
});
//set and show
controller.setMediaPlayer(this);
controller.setAnchorView(findViewById(R.id.song_list));
controller.setEnabled(true);
}
private void playNext(){
musicSrv.playNext();
if(playbackPaused){
setController();
playbackPaused=false;
}
controller.show(0);
}
private void playPrev(){
musicSrv.playPrev();
if(playbackPaused){
setController();
playbackPaused=false;
}
controller.show(0);
}
@Override
protected void onPause(){
super.onPause();
paused=true;
}
@Override
protected void onResume(){
super.onResume();
if(paused){
setController();
paused=false;
}
}
@Override
protected void onStop() {
controller.hide();
super.onStop();
}
@Override
protected void onDestroy() {
stopService(playIntent);
musicSrv=null;
super.onDestroy();
}
}
2.我的音乐服务
package com.playmusic.ghufron;
import java.util.ArrayList;
import java.util.Random;
import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.ContentUris;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Binder;
import android.os.IBinder;
import android.os.PowerManager;
import android.util.Log;
public class MusicService extends Service implements
MediaPlayer.OnPreparedListener, MediaPlayer.OnErrorListener,
MediaPlayer.OnCompletionListener {
//media player
private MediaPlayer player;
//song list
private ArrayList<Song> songs;
//current position
private int songPosn;
//binder
private final IBinder musicBind = new MusicBinder();
//title of current song
private String songTitle="";
//notification id
private static final int NOTIFY_ID=1;
//shuffle flag and random
private boolean shuffle=false;
private Random rand;
public void onCreate(){
//create the service
super.onCreate();
//initialize position
songPosn=0;
//random
rand=new Random();
//create player
player = new MediaPlayer();
//initialize
initMusicPlayer();
}
public void initMusicPlayer(){
//set player properties
player.setWakeMode(getApplicationContext(),
PowerManager.PARTIAL_WAKE_LOCK);
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
//set listeners
player.setOnPreparedListener(this);
player.setOnCompletionListener(this);
player.setOnErrorListener(this);
}
//pass song list
public void setList(ArrayList<Song> theSongs){
songs=theSongs;
}
//binder
public class MusicBinder extends Binder {
MusicService getService() {
return MusicService.this;
}
}
//activity will bind to service
@Override
public IBinder onBind(Intent intent) {
return musicBind;
}
//release resources when unbind
@Override
public boolean onUnbind(Intent intent){
player.stop();
player.release();
return false;
}
//play a song
public void playSong(){
//play
player.reset();
//get song
Song playSong = songs.get(songPosn);
//get title
songTitle=playSong.getTitle();
//get id
long currSong = playSong.getID();
//set uri
Uri trackUri = ContentUris.withAppendedId(
android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
currSong);
Uri trackUri2 = ContentUris.withAppendedId(android.provider.MediaStore.Audio.Media.INTERNAL_CONTENT_URI,currSong);
//set the data source
try{
player.setDataSource(getApplicationContext(), trackUri);
player.setDataSource(getApplicationContext(),trackUri2);
}
catch(Exception e){
Log.e("MUSIC SERVICE", "Error setting data source", e);
}
player.prepareAsync();
}
//set the song
public void setSong(int songIndex){
songPosn=songIndex;
}
@Override
public void onCompletion(MediaPlayer mp) {
//check if playback has reached the end of a track
if(player.getCurrentPosition()>0){
mp.reset();
playNext();
}
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
Log.v("MUSIC PLAYER", "Playback Error");
mp.reset();
return false;
}
@Override
public void onPrepared(MediaPlayer mp) {
//start playback
mp.start();
//notification
Intent notIntent = new Intent(this, MainActivity.class);
notIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendInt = PendingIntent.getActivity(this, 0,
notIntent, PendingIntent.FLAG_UPDATE_CURRENT);
Notification.Builder builder = new Notification.Builder(this);
builder.setContentIntent(pendInt)
.setSmallIcon(R.drawable.play)
.setTicker(songTitle)
.setOngoing(true)
.setContentTitle("Playing")
.setContentText(songTitle);
Notification ya= builder.build();
startForeground(NOTIFY_ID, ya);
}
//playback methods
public int getPosn(){
return player.getCurrentPosition();
}
public int getDur(){
return player.getDuration();
}
public boolean isPng(){
return player.isPlaying();
}
public void pausePlayer(){
player.pause();
}
public void seek(int posn){
player.seekTo(posn);
}
public void go(){
player.start();
}
//skip to previous track
public void playPrev(){
songPosn--;
if(songPosn<0) songPosn=songs.size()-1;
playSong();
}
//skip to next
public void playNext(){
if(shuffle){
int newSong = songPosn;
while(newSong==songPosn){
newSong=rand.nextInt(songs.size());
}
songPosn=newSong;
}
else{
songPosn++;
if(songPosn>=songs.size()) songPosn=0;
}
playSong();
}
@Override
public void onDestroy() {
stopForeground(true);
}
//toggle shuffle
public void setShuffle(){
if(shuffle) shuffle=false;
else shuffle=true;
}
}
3.我的清单
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.playmusic.ghufron.MainActivity"
android:label="@string/app_name"
android:launchMode="singleTop"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name="com.playmusic.ghufron.MusicService"/>
</application>
</manifest>
这是我的main_activity.xml
<LinearLayout xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
android:baselineAligned="true"
android:orientation="vertical"
tools:context=".MainActivity" >
<!-- song list -->
<LinearLayout
android:id="@+id/ll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#000000"
android:gravity="right" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Noads" />
</LinearLayout>
<ListView
android:id="@+id/song_list"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="3.29"
android:longClickable="true" >
</ListView>
</LinearLayout>
这里是我的歌曲适配器
package com.playmusic.ghufron;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;
public class SongAdapter extends BaseAdapter {
//song list and layout
private ArrayList<Song> songs;
private LayoutInflater songInf;
//constructor
public SongAdapter(Context c, ArrayList<Song> theSongs){
songs=theSongs;
songInf=LayoutInflater.from(c);
}
@Override
public int getCount() {
return songs.size();
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//map to song layout
LinearLayout songLay = (LinearLayout)songInf.inflate
(R.layout.song, parent, false);
//get title and artist views
TextView songView = (TextView)songLay.findViewById(R.id.song_title);
TextView artistView = (TextView)songLay.findViewById(R.id.song_artist);
//get song using position
Song currSong = songs.get(position);
//get title and artist strings
songView.setText(currSong.getTitle());
artistView.setText(currSong.getArtist());
//set position as tag
songLay.setTag(position);
return songLay;
}
}
解释：我的应用程序工作正常但是当我点击列表视图时它崩溃了但是当我点击确定时音乐播放并停止!!!
答案 0 :(得分：-1)
API级别16（Android 4.1）中添加了build()方法。您可能正在尝试在较旧版本的Android上运行代码。
从API级别16开始，不推荐使用getNotification()方法，但可以在较旧的API级别使用＆gt; = 11。
注意：整个Notification.Builder类是在API级别11（Honeycomb）中添加的，因此我假设您的应用程序所需的最低API级别至少为11。
要解决您的问题，您可以使用以下代码。
Notification ya =
(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) ?
builder.build() : builder.getNotification();