Android下MP3播放器的实现源代码02

第七个类ListActivity

package com.alex.media;



import android.app.Activity;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.media.AudioManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.KeyEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.LinearLayout.LayoutParams;

public class ListActivity extends Activity {
	private static final String MUSIC_LIST = "com.alex.list";
	private ListView listview;
	private int[] _ids;
	private String[]_titles;
	private int pos;
	private  MusicListAdapter adapter;
	private ScanSdReceiver scanSdReceiver = null;
	private AlertDialog ad = null;
	private AlertDialog.Builder  builder = null;
	
	//关于音量的变量
	private AudioManager mAudioManager = null;
	private int maxVolume;//最大音量
	private int currentVolume;//当前音量
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
      //注册广播接收器
        IntentFilter filter = new IntentFilter();
        filter.addAction(MUSIC_LIST);
        registerReceiver(changeItem, filter);
        
        //测试是否有音乐在播放
        Intent intent = new Intent();
        intent.setAction("com.alex.media.MUSIC_SERVICE");
        intent.putExtra("list", 1);
        startService(intent);
        
        listview = new ListView(this);
        Cursor c = this.getContentResolver()
        		.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
        				new String[]{MediaStore.Audio.Media.TITLE,
						MediaStore.Audio.Media.DURATION,
						MediaStore.Audio.Media.ARTIST,
						MediaStore.Audio.Media._ID,
						MediaStore.Audio.Media.DISPLAY_NAME },
        				null, null, null);
        if (c==null || c.getCount()==0){
        	builder = new AlertDialog.Builder(this);
			builder.setMessage("存储列表为空...").setPositiveButton("确定", null);
			ad = builder.create();
			ad.show();
        }
        c.moveToFirst();
        _ids = new int[c.getCount()];
        _titles = new String[c.getCount()];
        for(int i=0;i<c.getCount();i++){
        	_ids[i] = c.getInt(3);
        	_titles[i] = c.getString(0);
        	c.moveToNext();
        }
        adapter = new MusicListAdapter(this, c);
        listview.setAdapter(adapter);
        listview.setOnItemClickListener(new ListItemClickListener());
        
        mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 
		maxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);//获得最大音量  
		currentVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);//获得当前音量 
		LinearLayout list = new LinearLayout(this);
		list.setBackgroundResource(R.drawable.listbg);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
        LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
        list.addView(listview,params);
        setContentView(list);
    }
   
    class ListItemClickListener implements OnItemClickListener{

    	@Override
    	public void onItemClick(AdapterView<?> arg0, View view, int position, long id) {
    		// TODO Auto-generated method stub
    		Intent intent = new Intent(ListActivity.this,MusicActivity.class);
    		intent.putExtra("_ids", _ids);
    		intent.putExtra("_titles", _titles);
    		intent.putExtra("position", position);
    		startActivity(intent);
    		finish();
    	}
    	
    }
    
   
    
    public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == event.KEYCODE_BACK) {
			if (scanSdReceiver!=null)
      				unregisterReceiver(scanSdReceiver);
			Intent intent = new Intent();
			intent.setClass(this, MainActivity.class);
			startActivity(intent);
			finish();
		}
		return true;
    }
    public boolean dispatchKeyEvent(KeyEvent event) { 
		int action = event.getAction(); 
		int keyCode = event.getKeyCode(); 
		switch (keyCode) { 
			case KeyEvent.KEYCODE_VOLUME_UP: 
			if (action == KeyEvent.ACTION_UP) {
				if (currentVolume<maxVolume){
					currentVolume = currentVolume + 1;
					mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume, 0);
				} else {
					mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume, 0);
				}
			} 
			return false; 
			case KeyEvent.KEYCODE_VOLUME_DOWN: 
			if (action == KeyEvent.ACTION_UP) { 
				if (currentVolume>0){
					currentVolume = currentVolume - 1;
					mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume , 0);
				} else {
					mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume, 0);
				}
			} 
			return false; 
			default: 
			return super.dispatchKeyEvent(event); 
		} 
	}
    private BroadcastReceiver changeItem = new BroadcastReceiver() {
		
		@Override
		public void onReceive(Context context, Intent intent) {
			if (intent.getAction().equals(MUSIC_LIST)){
				pos = intent.getExtras().getInt("position");
				adapter.setItemIcon(pos);//改变列表项图标
				adapter.notifyDataSetChanged();//通知UI更新
			}
			
		}
	};
	
	@Override
	protected void onStop() {
		super.onStop();
		unregisterReceiver(changeItem);
	}
	

}

类八LRCbean

package com.alex.media;

public class LRCbean {
	private int beginTime=0;
	public int getBeginTime() {
		return beginTime;
	}
	public void setBeginTime(int beginTime) {
		this.beginTime = beginTime;
	}
	public int getLineTime() {
		return lineTime;
	}
	public void setLineTime(int lineTime) {
		this.lineTime = lineTime;
	}
	public String getLrcBody() {
		return lrcBody;
	}
	public void setLrcBody(String lrcBody) {
		this.lrcBody = lrcBody;
	}
	private int  lineTime=0;
	private String lrcBody = null;
	
}

类⑨LRCKlokView

package com.alex.media;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;

public class LRCKlokView extends View{
	private Paint p = null;
	public LRCKlokView(Context context, AttributeSet attrs) {
		super(context, attrs);
		p = new Paint();
	}
	@Override
	public void draw(Canvas canvas) {
		// TODO Auto-generated method stub
		super.draw(canvas);
		p.setColor(Color.GREEN);
	}
	
	public void invalidate(String lrc){
		Canvas canvas = new Canvas();
		canvas.drawText(lrc, 0, 30, p);
	}

}

类⑩MainActivity

package com.alex.media;

import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.media.AudioManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;

public class MainActivity extends Activity{
	private ListView listview=null;
	private Intent intent = null;
	private static final int ITEM1 = Menu.FIRST;
	private static final int ITEM2 = Menu.FIRST+1;
	private ScanSdReceiver scanSdReceiver = null;
	private AudioManager mAudioManager = null;
	private int maxVolume;//最大音量
	private int currentVolume;//当前音量
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		String[] strs = {"全部音乐","最近播放列表","最经常播放列表"};
		ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1,strs);
		listview = new ListView(this);
		listview.setAdapter(adapter);
		listview.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int position,
					long id) {
				switch (position) {
				case 0:
			        intent = new Intent();
					intent.setClass(MainActivity.this, ListActivity.class);
					startActivity(intent);
					finish();
					break;

				case 1:
					intent = new Intent();
					intent.setClass(MainActivity.this, RecentlyActivity.class);
					startActivity(intent);
					finish();
					break;
				case 2:
					intent = new Intent();
					intent.setClass(MainActivity.this, ClicksActivity.class);
					startActivity(intent);
					finish();
					break;
				}
				
			}
		});
	    mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 
		maxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);//获得最大音量  
		currentVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);//获得当前音量 
		this.setContentView(listview);
	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		super.onCreateOptionsMenu(menu);
		menu.add(0, ITEM1, 0, "刷新库");
		menu.add(0, ITEM2, 0, "退出");
		return true;
	}
	
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		
		switch (item.getItemId()){
			case ITEM1:
				scanSdCard();
				break;
			case ITEM2:
				if (scanSdReceiver!=null)
      				unregisterReceiver(scanSdReceiver);
				this.finish();
				Intent intent = new Intent();
				intent.setAction("com.alex.media.MUSIC_SERVICE");
				stopService(intent);
				break;
			default:
				break;
		}
		return true;
	}
	
	 private void scanSdCard(){
	    	IntentFilter intentfilter = new IntentFilter( Intent.ACTION_MEDIA_SCANNER_STARTED);
	    	intentfilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
	    	intentfilter.addDataScheme("file");
	    	scanSdReceiver = new ScanSdReceiver();
	    	registerReceiver(scanSdReceiver, intentfilter);
	    	sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
	    			Uri.parse("file://" + Environment.getExternalStorageDirectory().getAbsolutePath())));
	    }
	 
	 public boolean dispatchKeyEvent(KeyEvent event) { 
			int action = event.getAction(); 
			int keyCode = event.getKeyCode(); 
			switch (keyCode) { 
				case KeyEvent.KEYCODE_VOLUME_UP: 
				if (action == KeyEvent.ACTION_UP) {
					if (currentVolume<maxVolume){
						currentVolume = currentVolume + 1;
						mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume, 0);
					} else {
						mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume, 0);
					}
				} 
				return false; 
				case KeyEvent.KEYCODE_VOLUME_DOWN: 
				if (action == KeyEvent.ACTION_UP) { 
					if (currentVolume>0){
						currentVolume = currentVolume - 1;
						mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume , 0);
					} else {
						mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume, 0);
					}
				} 
				return false; 
				default: 
				return super.dispatchKeyEvent(event); 
			} 
		}
	 
}