android示例：简单的播放MP3并显示歌词的应用（待更新）

闲来无事，写了个小应用，能够播放固定的MP3，并显示歌词，待改进地方有：
1 可播放目录内所有歌曲文件，并同时显示歌词
2 有进度条
3 可快进，回退，停止等

待弄明白的是：判断何时是唱歌的的起始点。
以下为示例：
布局文件main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:local="http://schemas.android.com/apk/res/com.android.test"android:layout_width="fill_parent"android:layout_height="fill_parent" ><Button
        android:id="@+id/startbt"            android:layout_width="wrap_content"android:layout_height="wrap_content"android:gravity="center"android:layout_gravity="center"android:text="@string/start">Button><com.android.test.view.LyricView
        android:id="@+id/mylrc"android:layout_width="fill_parent"android:layout_height="fill_parent"android:gravity="center"android:layout_gravity="center"android:layout_marginTop="0dp"android:layout_marginBottom="0dp"android:background="@drawable/bg"  android:visibility="gone"      />FrameLayout>

歌词view：

package com.android.test.view;import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.Currency;
import java.util.Iterator;
import java.util.TreeMap;
import java.util.regex.Pattern;import android.R.integer;
import android.app.ActionBar.Tab;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.text.Layout.Alignment;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.RelativeLayout;public class LyricView extends RelativeLayout {private static String TAG = "qjy";private TextPaint mPaint; private int currentIndex = 0;private String currentLrc = null;private static TreeMap lrc_map;public LyricView(Context context){super(context);init();}public LyricView(Context context, AttributeSet attrs){super(context, attrs);init();}private void init(){lrc_map = new TreeMap();mPaint = new TextPaint();mPaint.setColor(Color.RED);mPaint.setTextSize(20);
//      mPaint.setTextAlign(Paint.Align.CENTER);Thread myThread = new Thread(new Runnable() {@Overridepublic void run() {try {read("/data/app/test.lrc");} catch (Exception e) {Log.e(TAG, "ERROR: can not read test.lrc");}}});myThread.start();       }@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){super.onMeasure(widthMeasureSpec, heightMeasureSpec);}@Overrideprotected void onDraw(Canvas canvas){super.onDraw(canvas);Log.e(TAG, "LyricView onDraw start");//      LyricObject ones = lrc_map.get(5);if (currentIndex < 6) {StringBuilder  testString = new StringBuilder();for (int j = 0; j < 6; j++) {if (testString.toString() != null) {testString.append("\n\r");}           testString.append(lrc_map.get(j).lrc);}StaticLayout layout = new StaticLayout(testString.toString(), mPaint, getMeasuredWidth()-getPaddingLeft()-getPaddingRight(), Alignment.ALIGN_CENTER, 1, 0, true);canvas.save();layout.draw(canvas);canvas.restore();return;}currentLrc = lrc_map.get(currentIndex).lrc;Rect boundRect = new Rect();mPaint.getTextBounds(currentLrc, 0,currentLrc.length(), boundRect);canvas.drawText(currentLrc, getMeasuredWidth()/2 - boundRect.width()/2 , getMeasuredHeight()/2 + boundRect.height()/2, mPaint);}public void setTime(int time){int c;if (currentIndex == (lrc_map.size()-1)) {return;}for (c = currentIndex; c < lrc_map.size()-1; c++) {if (time > lrc_map.get(c).begintime && time < lrc_map.get(c+1).begintime) {currentIndex = c;break;}else if (time > lrc_map.get(lrc_map.size()-1).begintime) {currentIndex = lrc_map.size()-1;break;}           }       Log.e(TAG, "current index is "+currentIndex);}public static void read(String file){String data;String mTime;int min;int sec;int ms;int i = 0;LyricObject item;Log.e(TAG, "start to read ! ");lrc_map.clear();try {File f = new File(file);FileInputStream fis = new FileInputStream(f);BufferedReader br = new BufferedReader(new InputStreamReader(fis, "GB2312"));Pattern pattern = Pattern.compile("[0-9]*");while ((data = br.readLine()) != null) {item = new LyricObject();               mTime = data.substring(data.indexOf("[") + 1, data.indexOf("]"));if (pattern.matcher(mTime.substring(0, mTime.indexOf(":"))).matches()) {min = Integer.parseInt(mTime.substring(0, mTime.indexOf(":")));sec = Integer.parseInt(mTime.substring(mTime.indexOf(":")+1, mTime.indexOf(".")));ms = Integer.parseInt(mTime.substring(mTime.indexOf(".")+1));item.begintime = (min*60 + sec)*1000 + ms;item.lrc = data.substring(data.indexOf("]")+1);} else {item.begintime = 0;item.lrc = mTime;}Log.e(TAG, "i IS " + i);lrc_map.put(new Integer(i), item);              Log.e(TAG, "begintime IS " + lrc_map.get(i).begintime);Log.e(TAG, "LRC IS " + lrc_map.get(i).lrc);i++;}fis.close();            } catch (Exception e) {Log.e(TAG, "ERROR can not read! ");e.printStackTrace();}}protected static class LyricObject {protected int begintime;protected int endtime;protected int consume;protected String lrc;}
}

主文件：

package com.android.test;import com.android.test.view.LyricView;
import com.android.test.view.TitleView;import android.app.Activity;
import android.os.Bundle;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.view.View.OnClickListener;
import android.content.res.Configuration;
import android.media.MediaPlayer;
import android.os.Handler;public class MActivity extends Activity {String TAG = "qjy";Button myButton;LyricView mv;TitleView mtv;Thread spThread;Thread lrcT;private String mp3 = "file:///data/app/test.mp3";MediaPlayer myMP;Handler mHandler = new Handler(){public void handleMessage(Message msg){Log.e(TAG, "handlerMessage");switch (msg.what) {case 0:mv.setTime(msg.arg1);mv.invalidate();break;default:break;}super.handleMessage(msg);}};/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,  WindowManager.LayoutParams.FLAG_FULLSCREEN);  requestWindowFeature(Window.FEATURE_NO_TITLE);  setContentView(R.layout.main);Log.d(TAG, "onCreate");    myButton =(Button) findViewById(R.id.startbt);mv = (LyricView) findViewById(R.id.mylrc);mtv = (TitleView) findViewById(R.id.mytv);myButton.setOnClickListener(mListener);myMP = new MediaPlayer();}OnClickListener mListener = new OnClickListener() {@Overridepublic void onClick(View v) {myButton.setVisibility(View.GONE);mtv.setVisibility(View.GONE);mv.setVisibility(View.VISIBLE);mv.invalidate();try {myMP.setDataSource(mp3);myMP.prepare();} catch (Exception e) {Log.e(TAG, "ERROR: can not start mediaplayer");e.printStackTrace();}startPlayer();}};private void startPlayer() {spThread = new Thread(new Runnable() {@Overridepublic void run() {myMP.start();               }});lrcT = new Thread(new Runnable() {Message msg; @Overridepublic void run() {try {while (true) {Thread.sleep(1000);Log.e(TAG, "current position is " + myMP.getCurrentPosition());msg = mHandler.obtainMessage();msg.arg1 = myMP.getCurrentPosition();msg.what = 0;mHandler.sendMessage(msg);}                   } catch (Exception e) {Log.e(TAG, "ERROR: set current position!");e.printStackTrace();}}});spThread.start();lrcT.start();}@Overridepublic void onStart(){super.onStart();Log.d(TAG, "onStart");}@Overridepublic void onRestart(){   super.onRestart();Log.d(TAG, "onRestart");} @Overridepublic void onPause(){   super.onPause();Log.d(TAG, "onPause");}@Overridepublic void onResume(){   super.onResume();Log.d(TAG, "onResume");}@Overridepublic void onStop(){   super.onStop();Log.d(TAG, "onStop");}@Overridepublic void onDestroy(){   super.onDestroy();Log.d(TAG, "onDestroy");spThread.interrupt();lrcT.interrupt();}@Overridepublic void onSaveInstanceState(Bundle outState){super.onSaveInstanceState(outState);Log.d(TAG, "onSaveInstanceState");}@Overridepublic void onRestoreInstanceState(Bundle outState){super.onRestoreInstanceState(outState);Log.d(TAG, "onRestoreInstanceState");}@Overridepublic void onConfigurationChanged(Configuration newConfig){super.onConfigurationChanged(newConfig);Log.d(TAG, "onConfigurationChanged");}}

manifest文件：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.android.test"android:versionCode="1"android:versionName="1.0"><application android:label="@string/app_name" android:icon="@drawable/ic_launcher"><activity android:name="MActivity"android:label="@string/app_name"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" />intent-filter>activity>application>
manifest>

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