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

<?xml version="1.0" encoding="utf-8"?>
<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<Integer, LyricObject> 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<Integer, LyricView.LyricObject>();

mPaint = new TextPaint();
mPaint.setColor(Color.RED);
mPaint.setTextSize(20);
//      mPaint.setTextAlign(Paint.Align.CENTER);
Thread myThread = new Thread(new Runnable() {
@Override
public void run() {
try {
read("/data/app/test.lrc");
} catch (Exception e) {
Log.e(TAG, "ERROR: can not read test.lrc");
}

}
});

myThread.start();
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

@Override
protected 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 =
c1c6
"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. */
@Override
public 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() {

@Override
public 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() {

@Override
public void run() {
myMP.start();
}
});

lrcT = new Thread(new Runnable() {
Message msg;

@Override
public 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();
}

@Override
public void onStart()
{
super.onStart();
Log.d(TAG, "onStart");
}

@Override
public void onRestart()
{
super.onRestart();
Log.d(TAG, "onRestart");
}

@Override
public void onPause()
{
super.onPause();
Log.d(TAG, "onPause");
}

@Override
public void onResume()
{
super.onResume();
Log.d(TAG, "onResume");
}

@Override
public void onStop()
{
super.onStop();
Log.d(TAG, "onStop");
}

@Override
public void onDestroy()
{
super.onDestroy();
Log.d(TAG, "onDestroy");

spThread.interrupt();
lrcT.interrupt();
}

@Override
public void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
Log.d(TAG, "onSaveInstanceState");
}

@Override
public void onRestoreInstanceState(Bundle outState)
{
super.onRestoreInstanceState(outState);
Log.d(TAG, "onRestoreInstanceState");
}

@Override
public void onConfigurationChanged(Configuration newConfig)
{
super.onConfigurationChanged(newConfig);
Log.d(TAG, "onConfigurationChanged");
}

}

manifest文件：

<?xml version="1.0" encoding="utf-8"?>
<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>