獲取屏幕Display: Activity.getWindowManager().getDefaultDisplay();
獲取擴展存儲目錄：Environment.getExternalStorageDirectory()
通過文件獲取Uri：Uri.fromFile(File)
根據文件路徑獲取圖片：BitmapFactory.decodeFile(imageFilePath, bmpFactoryOptions)
獲取相機Intent：new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
獲取相機拍照后的圖片：
Bundle extras = intent.getExtras();
Bitmap bmp = (Bitmap) extras.get("data");
觸摸事件:onTouchEvent(MotionEvent ev)
媒體播放器：android.media.MediaPlayer
媒體控制器：android.widget.MediaController（和播放器不在同一個package下）
SurfaceView是視圖(View)的繼承類，這個視圖里內嵌了一個專門用于繪制的Surface，類似于Canvas，但感覺比Canvas更高級。
android.provider.MediaStore里包含了相關的Image，Video，Audio信息，可通過managedQuery方法來查詢和遍歷。
Android中的AdapterView使用Adapter來獲取數據，和JFace中的ContentProvider對應。
根據字符串路徑獲取Uri：Uri.parse((String)Path)
封裝好的視頻View：android.widget.VideoView
視頻錄制：android.media.MediaRecorder
相機高畫質：CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
設置透明度（這是窗體本身的透明度，非背景）
WindowManager.LayoutParams lp=getWindow().getAttributes();
lp.alpha=0.3f;
getWindow().setAttributes(lp);
alpha在0.0f到1.0f之間。1.0完全不透明，0.0f完全透明
設置黑暗度
WindowManager.LayoutParams lp=getWindow().getAttributes();
lp.dimAmount=0.5f;
getWindow().setAttributes(lp);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
dimAmount在0.0f和1.0f之間，0.0f完全不暗，1.0f全暗
設置背景模糊
getWindow().setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
//調用瀏覽器
Uri uri = Uri.parse("");
Intent it = new Intent(Intent.ACTION_VIEW,uri);
startActivity(it);
//顯示某個坐標在地圖上
Uri uri = Uri.parse("geo:38.899533,-77.036476");
Intent it = new Intent(Intent.Action_VIEW,uri);
startActivity(it);
//顯示路徑
Uri uri = Uri.parse("http://maps.google.com/maps?f=d&saddr=startLat%20startLng&daddr=endLat%20endLng&hl=en");
Intent it = new Intent(Intent.ACTION_VIEW,URI);
startActivity(it);
//撥打電話
Uri uri = Uri.parse("tel:10086");
Intent it = new Intent(Intent.ACTION_DIAL, uri);
startActivity(it);
Uri uri = Uri.parse("tel.10086");
Intent it =new Intent(Intent.ACTION_CALL,uri);
//需要添加 <uses-permission id="android.permission.CALL_PHONE" /> 這個權限到androidmanifest.xml
//發送短信或彩信
Intent it = new Intent(Intent.ACTION_VIEW);
it.putExtra("sms_body", "The SMS text");
it.setType("vnd.android-dir/mms-sms");
startActivity(it);
//發送短信
Uri uri = Uri.parse("smsto:10086");
Intent it = new Intent(Intent.ACTION_SENDTO, uri);
it.putExtra("sms_body", "cwj");
startActivity(it);
//發送彩信
Uri uri = Uri.parse("content://media/external/images/media/23");
Intent it = new Intent(Intent.ACTION_SEND);
it.putExtra("sms_body", "some text");
it.putExtra(Intent.EXTRA_STREAM, uri);
it.setType("image/png");
startActivity(it);
//發送郵件
Uri uri = Uri.parse("mailto:android123@163.com");
Intent it = new Intent(Intent.ACTION_SENDTO, uri);
startActivity(it);
Intent it = new Intent(Intent.ACTION_SEND);
it.putExtra(Intent.EXTRA_EMAIL, android123@163.com);
it.putExtra(Intent.EXTRA_TEXT, "The email body text");
it.setType("text/plain");
startActivity(Intent.createChooser(it, "Choose Email Client"));
Intent it=new Intent(Intent.ACTION_SEND);
String[] tos={"me@abc.com"};
String[] ccs={"you@abc.com"};
it.putExtra(Intent.EXTRA_EMAIL, tos);
it.putExtra(Intent.EXTRA_CC, ccs);
it.putExtra(Intent.EXTRA_TEXT, "The email body text");
it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");
it.setType("message/rfc822");
startActivity(Intent.createChooser(it, "Choose Email Client"));
//播放媒體文件
Intent it = new Intent(Intent.ACTION_VIEW);
Uri uri = Uri.parse("file:///sdcard/cwj.mp3");
it.setDataAndType(uri, "audio/mp3");
startActivity(it);
Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//卸載APK
Uri uri = Uri.fromParts("package", strPackageName, null);
Intent it = new Intent(Intent.ACTION_DELETE, uri);
startActivity(it);
//卸載apk 2
Uri uninstallUri = Uri.fromParts("package", "xxx", null);
returnIt = new Intent(Intent.ACTION_DELETE, uninstallUri);
//安裝APK
Uri installUri = Uri.fromParts("package", "xxx", null);
returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);
//播放音樂
Uri playUri = Uri.parse("file:///sdcard/download/sth.mp3");
returnIt = new Intent(Intent.ACTION_VIEW, playUri);
//發送附近
Intent it = new Intent(Intent.ACTION_SEND);
it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");
it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/cwj.mp3");
sendIntent.setType("audio/mp3");
startActivity(Intent.createChooser(it, "Choose Email Client"));
//market上某個應用信，pkg_name就是應用的packageName
Uri uri = Uri.parse("market://search?q=pname:pkg_name");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//market上某個應用信息，app_id可以通過www網站看下
Uri uri = Uri.parse("market://details?id=app_id");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//調用搜索
Intent intent = new Intent();
intent.setAction(Intent.ACTION_WEB_SEARCH);
intent.putExtra(SearchManager.QUERY,"android123")
startActivity(intent);
//調用分享菜單
Intent intent=new Intent(Intent.ACTION_SEND);
intent.setType("text/plain"); //分享的數據類型
intent.putExtra(Intent.EXTRA_SUBJECT, "subject"); //主題
intent.putExtra(Intent.EXTRA_TEXT, "content"); //內容
startActivity(Intent.createChooser(intent, "title")); //目標應用選擇對話框的標題
獲取Location：
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
criteria.setPowerRequirement(Criteria.POWER_LOW);
LocationManager locManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
if(locManager.getBestProvider(criteria, true) != null)
myLocation = locManager.getLastKnownLocation(locManager.getBestProvider(criteria, true));
else {
myLocation = new Location("gps");
myLocation.setLatitude(47.100301);
myLocation.setLongitude(-119.982465);
}