Android基础练习

package com.fqq.mp3player; import java.io.FileInputStream; import java.io.InputStream; import java.util.ArrayList; import java.util.Queue; import com.fqq.model.Mp3Info; import com.fqq.mp3player.service.AppConstant; import com.fqq.mp3player.service.PlayerService; import com.fqq.src.LrcProcessor; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.media.MediaPlayer; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.view.View; import android.view.View.OnClickListener; import android.widget.ImageButton; import android.widget.TextView; public class PlayerActivity extends Activity{ private ImageButton startButton = null; private ImageButton pauseButton = null; private ImageButton stopButton = null; MediaPlayer mediaPlayer = null; private ArrayList<Queue> queues = null; private TextView lrcTextView = null; private Mp3Info mp3Info = null; private Handler handler = new Handler(); private long start = 0; private long nextTimeMill = 0; private long currentTimeMill = 0; private String message = null; private long pauseTimeMills = 0; private boolean isPlaying = false; private IntentFilter intentFilter = null; private BroadcastReceiver receiver = null; // 当Activity处于不可见的状态时就会执行onPause()方法 @Override protected void onPause() { super.onPause(); unregisterReceiver(receiver); } // 当Avtivity处于可见的状态或恢复到可见的状态就会执行onResume()方法 @Override protected void onResume() { super.onResume(); receiver = new LrcMessageBroadcastReceiver(); registerReceiver(receiver, getIntentFileter()); } @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.player); Intent intent = getIntent(); mp3Info = (Mp3Info) intent.getSerializableExtra("mp3Info"); startButton = (ImageButton)findViewById(R.id.start); pauseButton = (ImageButton)findViewById(R.id.pause); stopButton = (ImageButton)findViewById(R.id.stop); startButton.setOnClickListener(new StartButtonListener()); pauseButton.setOnClickListener(new PauseButtonListener()); stopButton.setOnClickListener(new StopButtonListener()); lrcTextView = (TextView)findViewById(R.id.lrcText); System.out.println("PlayActivity ------>mp3Info ----->" + mp3Info); } // 根据歌词文件的名字，来读取歌词文件当中的信息 // private void prepareLrc(String lrcName){ // try { // InputStream inputStream = new FileInputStream(Environment.getExternalStorageDirectory().getAbsolutePath()+"/"); // LrcProcessor lrcProcessor = new LrcProcessor(); // queues = lrcProcessor.process(inputStream); // // 创建一个UpdateTimeCallback对象 // updateTimeCallback = new UpdateTimeCallback(queues); // start = 0; // currentTimeMill = 0; // nextTimeMill = 0; // } catch (Exception e) { // e.printStackTrace(); // } // } class StartButtonListener implements OnClickListener{ @Override public void onClick(View arg0) { // 创建一个Intent对象，用于通知Service开始播放MP3 Intent intent = new Intent(); intent.setClass(PlayerActivity.this, PlayerService.class); intent.putExtra("mp3Info", mp3Info); intent.putExtra("MSG", AppConstant.PlayerMsg.PLAY_MSG); // 读取lrc文件 // prepareLrc(mp3Info.getLrcName()); // 启动Service startService(intent); // 将start的值赋为当前毫秒值 // start = System.currentTimeMillis(); // // 执行updateTimeCallback // handler.postDelayed(updateTimeCallback, 5); // isPlaying = true; } } class PauseButtonListener implements OnClickListener{ @Override public void onClick(View arg0) { // TODO Auto-generated method stub Intent intent = new Intent(); intent.setClass(PlayerActivity.this, PlayerService.class); intent.putExtra("MSG", AppConstant.PlayerMsg.PAUSE_MSG); startService(intent); // if(isPlaying){ // handler.removeCallbacks(updateTimeCallback); // pauseTimeMills = System.currentTimeMillis(); // }else{ // handler.postDelayed(updateTimeCallback, 5); // start = System.currentTimeMillis() - pauseTimeMills + start; // } // isPlaying = isPlaying ? false : true; } } class StopButtonListener implements OnClickListener{ @Override public void onClick(View arg0) { // 通知Service停止播放MP3文件 Intent intent = new Intent(); intent.setClass(PlayerActivity.this, PlayerService.class); intent.putExtra("MSG", AppConstant.PlayerMsg.STOP_MSG); startService(intent); // handler.removeCallbacks(updateTimeCallback); } } // class UpdateTimeCallback implements Runnable{ // ArrayList<Queue> queues = null; // Queue times = null; // Queue messages = null; // public UpdateTimeCallback(ArrayList<Queue> queues) { // this.queues = queues; // // 从ArrayList当中取出相应的对象 // times = queues.get(0); // messages = queues.get(1); // } // @Override // public void run() { // // 计算偏移量，从开始播放mp3到现在为止，共消耗了多长时间，单位毫秒 // long offset = System.currentTimeMillis() - start; // if(currentTimeMill == 0){ // nextTimeMill = (Long) times.poll(); // message = (String)messages.poll(); // } // if(offset >= nextTimeMill){ // System.out.println("message is is is is :------->" + message); // lrcTextView.setText(message); // message = (String)messages.poll(); // nextTimeMill = (Long)times.poll(); // } // currentTimeMill = currentTimeMill + 10; // handler.postDelayed(updateTimeCallback, 10); // } // } private IntentFilter getIntentFileter(){ if(intentFilter == null){ intentFilter = new IntentFilter(); intentFilter.addAction(AppConstant.LRC_MESSAGE_ACTION); } return intentFilter; } /** * 广播接收器，主要接收Serivce所返回的广播，也就是更新歌词的TextView * @author Administrator * */ class LrcMessageBroadcastReceiver extends BroadcastReceiver{ @Override public void onReceive(Context content, Intent intent) { // 从Intent对象当中取出歌词信息 String lrcMessage = intent.getStringExtra("lrcMessage"); lrcTextView.setText(lrcMessage); } } }