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一，在主线程直接完成这一切，app退出，歌曲不播放了....（掌握contentResolver读取media信息和播放mp3）1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | package china.playsong;import android.app.ListActivity;import android.content.ContentResolver;import android.database.Cursor;import android.media.MediaPlayer;import android.os.Bundle;import android.provider.MediaStore;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.Toast;import java.io.IOException;import java.util.ArrayList;import java.util.List;public class MainActivity extends ListActivity implements AdapterView.OnItemClickListener { private ContentResolver resolver; private List<Bean> datas; private MediaPlayer player; private int currPlay = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); initView(); setListAdapter(new MyAdapter(datas, this)); getListView().setOnItemClickListener(this); } private void initView() { resolver = getContentResolver(); datas = new ArrayList<Bean>(); getDataFromPrivoder(); player = new MediaPlayer(); player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() { @Override public void onCompletion(MediaPlayer mediaPlayer) { //自动播放下一曲 currPlay = currPlay + 1; if (currPlay < datas.size()) { //如果不是最后一曲 String pathNext = datas.get(currPlay).getPath(); palySong(pathNext); } else { //如果是最后一曲，则归零 currPlay = 0; String pathZore = datas.get(0).getPath(); palySong(pathZore); } } }); } private void getDataFromPrivoder() { //过滤其他信息，只取MP3 Cursor cursor = resolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, "MIME_TYPE=?", new String[]{"audio/mpeg"}, null); //有时候参数设置错误，可能导致cursor的为空，所以加一个判断 if (cursor.getCount() != 0) { for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) { String title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE)); String songName = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME)); String path = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA)); String size = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE)) + ""; //加入数据 datas.add(new Bean(title, songName, path, size)); } } else { //提示为空 Log.i("ddd", "cursor is empty,please check!"); Toast.makeText(MainActivity.this, "cursor数据为空，请检查参数！", Toast.LENGTH_SHORT).show(); } } @Override public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) { //当前点击的位置传给全局变量 currPlay = position; //播放歌曲 palySong(datas.get(position).getPath()); } public void palySong(String path) { try { //检查清空 if (player.isPlaying()) { player.stop(); } //因为在主线程，所以把播放的歌曲信息显示在当前屏幕第上面 getListView().setSelection(currPlay); player.reset(); player.setDataSource(path); player.prepare(); player.start(); //歌曲播放完之后，进入onCompleteListener } catch (IOException e) { e.printStackTrace(); } } @Override protected void onDestroy() { if (player.isPlaying()) { player.stop(); } player.release(); super.onDestroy(); }} |
?其他的Adapter就是简单的继承baseAdapter的，item的layout就是四个textView；
二，过度到用Server播放，这里简单满足一下功能，（退出app后，继续后台播放，这下面没有添加在界面停止服务的功能，需要在应用程序中停止...... ）这里仅仅是应用一下service
这里的MainActivity只是获取一下数据，添加点击监听，打开服务....
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | package china.playsongbyservice;import android.content.ContentResolver;import android.content.Intent;import android.database.Cursor;import android.provider.MediaStore;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import android.widget.Toast;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity { private ListView listView; private List<Bean> lists; private ContentResolver resolver; protected static List<String> paths; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { listView = (ListView) findViewById(R.id.listView); lists = new ArrayList<Bean>(); //把path的路径集中，方便读取，因为这次service不与主线程互相通信 paths = new ArrayList<String>(); resolver =getContentResolver(); getDatas(); listView.setAdapter(new DemoAdapter(this, lists)); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { //打开服务 Intent intent = new Intent(MainActivity.this,PlayService.class); intent.putExtra("pos", i); intent.putExtra("path", lists.get(i).getPath()); startService(intent); } }); } //获取数据..... private void getDatas() { Cursor cursor = resolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, "MIME_TYPE=?", new String[]{"audio/mpeg"}, null); if (cursor.getCount() != 0) { for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) { String mtitle = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE)); String mName = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME)); String mType = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.MIME_TYPE)); String mPath = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA)); lists.add(new Bean(mtitle, mName, mType, mPath)); } } else { //提示为空 Log.i("ddd", "cursor is empty,please check!"); Toast.makeText(MainActivity.this, "cursor数据为空，请检查参数！", Toast.LENGTH_SHORT).show(); } if (lists != null) { for (int i = 0; i < lists.size(); i++) { paths.add(lists.get(i).getPath()); } } }} |
再写一个继承Service的类，基本是第一种主线程的移花接木
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | package china.playsongbyservice;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.os.IBinder;import android.support.annotation.Nullable;import java.io.IOException;/** * Created by Anonymous on 2016/2/24. */public class PlayService extends Service { private MediaPlayer player; private int currentPos; @Override public void onCreate() { super.onCreate(); player = new MediaPlayer(); player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() { @Override public void onCompletion(MediaPlayer mediaPlayer) { //自动下一曲 currentPos = currentPos + 1; if (currentPos < MainActivity.paths.size()) { String playNext = MainActivity.paths.get(currentPos); playSong(playNext); } else { currentPos = 0; String playZero = MainActivity.paths.get(0); playSong(playZero); } } }); } @Nullable @Override public IBinder onBind(Intent intent) { return null; } @Override public int onStartCommand(Intent intent, int flags, int startId) { // 在这里赋值 String playPath = intent.getStringExtra("path"); currentPos = intent.getIntExtra("pos", 0); playSong(playPath); return super.onStartCommand(intent, flags, startId); } @Override public void onDestroy() { if (player != null) { player.stop(); player.release(); } super.onDestroy(); } public void playSong(String str) { try { if (player.isPlaying()) { player.stop(); } player.reset(); player.setDataSource(str); player.prepare(); player.start(); } catch (IOException e) { e.printStackTrace(); } }} |
?
扫描SD卡，显示歌曲信息，简单播放MP3，层层低级掌握服务.............
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原文地址：http://www.cnblogs.com/share2015/p/5215222.html
