㈠ 怎样查看 android APP 源代码
用压缩软件打开apk文件，解压出根目录中的classes.dex文件
使用cmd ，dex2jar.bat classes.dex命令将classes.dex转换为jar
再用jd-gui打开该jar就可以查看源码了，如果apk安全性好的话，有些代码是看不到的
㈡ 基于Android音乐播放器源代码（正常播放、有列表）
package my.android.players;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.TextView;
public class mainActivity extends Activity {
private List<String> myMusicList=new ArrayList<String>();
//当前播放歌曲的索引
private int currentListItem=0;
//音乐的路径
private static final String MUSIC_PATH="/sdcard/mp3";
//播放对象
private MediaPlayer myMediaPlayer;
private TextView m_TextView;
//播放按钮
private ImageButton m_start;
private ImageButton m_stop;
private ImageButton m_next;
private ImageButton m_last;
/*设定bIsPaused一开始为false */
private boolean bIsRun = false;
private boolean isplay;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
myMediaPlayer=new MediaPlayer();
musicList();
m_TextView=(TextView)findViewById(R.id.mtextview);
m_start=(ImageButton)findViewById(R.id.imgbtn_start);
m_stop=(ImageButton)findViewById(R.id.imgbtn_stop);
m_next=(ImageButton)findViewById(R.id.imgbtn_next);
m_last=(ImageButton)findViewById(R.id.imgbtn_last);
listener();
Intent intent = this.getIntent();
Bundle bundle = intent.getExtras();
currentListItem = bundle.getInt("currentListItem");
isplay=bundle.getBoolean("isplay");
if(isplay==true)
{
bIsRun=false;
playMusic(MUSIC_PATH+"/"+myMusicList.get(currentListItem));
}
}
//监听事件
void listener(){
//开始
m_start.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try
{
if(myMediaPlayer.isPlaying()==true)
{
myMediaPlayer.pause();
m_start.setImageResource(R.drawable.pause);
}
else
{
playMusic(MUSIC_PATH+"/"+myMusicList.get(currentListItem));
}
}
catch (IllegalStateException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
//下一首
m_next.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
nextMusic();
}
});
//上一首
m_last.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
lastMusic();
}
});
//停止
m_stop.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
stopMusic();
}
});
myMediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
nextMusic();
}
});
}
//播放音乐
void playMusic(String path){
try {
if(bIsRun==false)
{
myMediaPlayer.reset();
myMediaPlayer.setDataSource(path);
myMediaPlayer.prepare();
myMediaPlayer.start();
/*
* 取出歌曲名的.mp3后缀
* */
String str=(myMusicList.get(currentListItem)).toString();
System.out.println(str);
String str1[]=str.split("\\.");
System.out.println(str1[0]);
m_TextView.setText(str1[0]);
}
else
{
myMediaPlayer.start();
}
m_start.setImageResource(R.drawable.start);
bIsRun=true;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
//下一首
void nextMusic(){
if(++currentListItem>=myMusicList.size()){
currentListItem=0;
}
bIsRun=false;
playMusic(MUSIC_PATH+"/"+myMusicList.get(currentListItem));
}
//上一首
void lastMusic(){
if(--currentListItem<0)
currentListItem=myMusicList.size()-1;
bIsRun=false;
playMusic(MUSIC_PATH+"/"+myMusicList.get(currentListItem));
}
//停止
void stopMusic() {
if (myMediaPlayer.isPlaying()) {
m_start.setImageResource(R.drawable.pause);
myMediaPlayer.stop();// 停止
bIsRun=false;
}
else
playMusic(MUSIC_PATH+"/"+myMusicList.get(currentListItem));
}
//当用户返回时结束音乐并释放音乐对象
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if(keyCode==KeyEvent.KEYCODE_BACK){
new AlertDialog.Builder(mainActivity.this).setTitle("message")
.setIcon(android.R.drawable.dialog_frame)
.setMessage("你确定要离开吗?")
.setPositiveButton("确定",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
myMediaPlayer.stop();
myMediaPlayer.release();
finish();
}
}).setNegativeButton("取消",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).show();
}
return super.onKeyDown(keyCode, event);
}
/**
* 文件过滤器
*
* @author
*
*/
class MusicFilter implements FilenameFilter {
@Override
public boolean accept(File dir, String filename) {
return (filename.endsWith(".mp3"));
}
}
//绑定音乐
void musicList(){
try{
File home=new File(MUSIC_PATH);
if(!home.exists())
home.mkdirs();
if(home.listFiles(new MusicFilter()).length>=0){
for(File file:home.listFiles(new MusicFilter())){
myMusicList.add(file.getName().toString());
}
}
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
}
package my.android.players;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class Activity01 extends Activity {
//播放列表
private List<String> myMusicList=new ArrayList<String>();
//当前播放歌曲的索引
private int currentListItem;
//音乐的路径
private static final String MUSIC_PATH="/sdcard/mp3";
//播放列表
private ListView m_ListView;
private boolean isplay=true;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
m_ListView=(ListView)findViewById(R.id.lv_music);
musicList();
//当选择列表项时播放音乐
m_ListView.setOnItemClickListener(new ListView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
currentListItem = arg2;
Intent intent = new Intent();
Bundle mBundle=new Bundle();
mBundle.putInt("currentListItem", currentListItem);
mBundle.putBoolean("isplay", isplay);
intent.putExtras(mBundle);
intent.setClass(Activity01.this,mainActivity.class);
startActivity(intent);
finish();
}
});
}
/**
* 文件过滤器
*
* @author
*
*/
class MusicFilter implements FilenameFilter {
@Override
public boolean accept(File dir, String filename) {
return (filename.endsWith(".mp3"));
}
}
//绑定音乐
void musicList(){
try{
File home=new File(MUSIC_PATH);
if(!home.exists())
home.mkdirs();
if(home.listFiles(new MusicFilter()).length>=0){
for(File file:home.listFiles(new MusicFilter())){
myMusicList.add(file.getName().toString());
}
ArrayAdapter<String> musicList=new ArrayAdapter<String>
(Activity01.this,android.R.layout.simple_list_item_1, myMusicList);
m_ListView.setAdapter(musicList);
}
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
}