安卓小程序——帶背景音樂,多功能實(shí)現(xiàn)

1、這是程序?qū)崿F(xiàn)了簡單的一些功能，包括窗口之間的跳 轉(zhuǎn)，和按鈕，菜單和消息提示框的實(shí)現(xiàn)，還實(shí)現(xiàn)了添加和播 放 mp3 音樂， 畫大小不斷變化的矩形和變化的同心圓， 并統(tǒng) 計(jì)它們的個(gè)數(shù)，下面只是部分 .java 文件的代碼，實(shí)現(xiàn)程序還 要添加和更改相應(yīng)的 .XML 文件，實(shí)現(xiàn) Android 仿真器啟用 SD存儲(chǔ)卡，以及使用命令adb+push上載文件到SD存儲(chǔ)卡等步驟。/這是 mainactivity 類public class ActivityMain extends Activity /主類，也是主窗體界面OnClickListener listener1 = null;OnClickList

2、ener listener2 = null;/定義兩個(gè)監(jiān)聽Button button1;/定義兩個(gè)Button button2;按鈕，用于跳轉(zhuǎn)到其它界面static final int REQUEST_CODE = 1;public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);listener1 = new OnClickListener() public void onClick(View v) Intent intent1 = newIntent(ActivityMain.this,

3、Activity1.class);intent1.putExtra(activityMain, 有主窗體跳來 );startActivityForResult(intent1,REQUEST_CODE);listener2 = new OnClickListener() public void onClick(View v) setTitle( 主窗體 );Intent intent2 = newIntent(ActivityMain.this, Activity2.class);startActivity(intent2);button1 = button1.setOnClickListen

4、er(listener1);button2 = button2.setOnClickListener(listener2); setTitle(ActivityMain);/這是 activity1/添加三個(gè)菜單事件public boolean onCreateOptionsMenu(Menu menu) menu.add(0,1,2,顯示字幕menu.add(0, 2, 1, 提示框 ); menu.add(0, 3, 3, 播放 mp3); return super.onCreateOptionsMenu(menu); public boolean onOptionsItemSelecte

5、d(MenuItem item) int item_id = item.getItemId();switch (item_id) case 1:TextView k = new TextView(this); k.setText(hevinn is a good student，welcome to myhometown.);setContentView(k);Toast.makeText(this,點(diǎn)擊菜單 2,Toast.LENGTH_SHORT).show();break;case 2:/ 通過一個(gè)提示框來向用戶提示下一步操作Toast.makeText(this,關(guān)閉菜單,Toast.

6、LENGTH_SHORT).show();new AlertDialog.Builder(this).setTitle(提示).setMessage(確定退出確定 , newDialogInterface.OnClickListener() public void onClick(DialogInterface dialog, int whichButton) setResult(RESULT_OK);/ 確定按鈕事件 finish();).setNegativeButton( 取消 , newDialogInterface.OnClickListener() public void onCl

7、ick(DialogInterface dialog, int whichButton) ) .show();/取消按鈕事件break;case 3:startActivity(newIntent(Activity1.this,mp3.class);/ 通過菜單三跳轉(zhuǎn)到音樂播放TextView k1 = new TextView(this);k1.setText( 執(zhí)行完 );setContentView(k1);return true;/下面是按鈕事件OnClickListener listener1 = null;Button button1;public void onCreate(Bu

8、ndle savedInstanceState) listener1 = new OnClickListener() public void onClick(View v) Bundle bundle = new Bundle();bundle.putString(store, 數(shù)據(jù)來 自 Activity1);Intent mIntent = new Intent(); mIntent.putExtras(bundle); setResult(RESULT_OK, mIntent); finish();button1 = String data=null;Bundle extras = ge

9、tIntent().getExtras();if (extras != null) data = extras.getString(activityMain);setTitle( 窗體 1+data);/這是 activity2public class Activity2 extends Activity OnClickListener listener = null;Button button;public void onCreate(Bundle savedInstanceState) listener = new OnClickListener() public void onClick

10、(View v) finish();button = button.setOnClickListener(listener);setTitle( 窗體 2);/跳轉(zhuǎn)到畫圖界面startActivity(new Intent(Activity2.this,touch.class);/這是 mp3 類class Mp3Filter implements FilenameFilter public boolean accept(File dir, String name) return (name.endsWith(.mp3);public class mp3 extends ListActivit

11、y private static final String MEDIA_PATH = new String(/sdcard/);private List<String> songs = newArrayList<String>();public void onCreate(Bundle icicle) try super.onCreate(icicle); catch (NullPointerException e) public void updateSongList() File home = new File(MEDIA_PATH);if (home.listFi

12、les( new Mp3Filter().length > 0) for (File file : home.listFiles( new Mp3Filter() songs.add(file.getName();ArrayAdapter<String> songList = newsetListAdapter(songList);/這是 touch 畫圖類public class touch extends Activity class MyView extends Viewprivate Paint mPaint, pointPaint;private Bitmap mB

13、itmap;Context mContext;int n;public MyView(Context context) super(context); mContext = context; mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setARGB(0, 0xff, 0, 0); pointPaint = new Paint(); pointPaint.setARGB(150, 0, 255, 255); pointPaint.setTextSize(30); DisplayMetrics dm = new DisplayM

14、etrics(); dm=getResources().getDisplayMetrics(); mBitmap =protected void onDraw(Canvas canvas) super.onDraw(canvas);if(mBitmap != null) canvas.drawBitmap(mBitmap, 0, 0, null);public boolean onTouchEvent(MotionEvent event) float x = 0;float y = 0;x = event.getX();y = event.getY();Canvas canvas = new

15、Canvas(); canvas.setBitmap(mBitmap); if(event.getAction() =MotionEvent.ACTION_DOWN)n+;mPaint.setARGB(0xff, 255, 250, 250); canvas.drawLine(getWidth()/2 , getHeight()/5, getWidth()/2,getHeight()/2, mPaint);/ 畫直線canvas.drawARGB(0, 70, 90, 0); canvas.drawCircle(x, y, 30, mPaint); invalidate();invalidate(); / 刷新 但不更新背景elsemPaint.setARGB(100, 0xff, 0, 0); canvas.drawCircle(x, y, 30-n, mPaint);invalidate();Rect rect1 = new Rect(); / 定 義矩形對(duì)象/ 設(shè)置矩形大小rect1.left = 6+n*n;rect1.top = 13+5+n*n; rect1.bottom = 130+25+n*n;rect1.right = 45+n*n; mPaint.setColor(Color.BLUE);/ 繪制矩形c