扫描SD卡，显示歌曲信息，简单播放MP3，层层低级掌握服务.............

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）


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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....


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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


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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();

        }

    }

}

?

来自为知笔记(Wiz)

时间： 2024-10-19 08:45:02

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