获取屏幕Display: Activity.getWindowManager().getDefaultDisplay();
获取扩展存储目录：Environment.getExternalStorageDirectory()
通过文件获取Uri：Uri.fromFile(File)
根据文件路径获取图片：BitmapFactory.decodeFile(imageFilePath, bmpFactoryOptions)
获取相机Intent：new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
获取相机拍照后的图片：
Bundle extras = intent.getExtras();
Bitmap bmp = (Bitmap) extras.get("data");
触摸事件:onTouchEvent(MotionEvent ev)
媒体播放器：android.media.MediaPlayer
媒体控制器：android.widget.MediaController（和播放器不在同一个package下）
SurfaceView是视图(View)的继承类，这个视图里内嵌了一个专门用于绘制的Surface，类似于Canvas，但感觉比Canvas更高级。
android.provider.MediaStore里包含了相关的Image，Video，Audio信息，可通过managedQuery方法来查询和遍历。
Android中的AdapterView使用Adapter来获取数据，和JFace中的ContentProvider对应。
根据字符串路径获取Uri：Uri.parse((String)Path)
封装好的视频View：android.widget.VideoView
视频录制：android.media.MediaRecorder
相机高画质：CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
设置透明度（这是窗体本身的透明度，非背景）
WindowManager.LayoutParams lp=getWindow().getAttributes();
lp.alpha=0.3f;
getWindow().setAttributes(lp);
alpha在0.0f到1.0f之间。1.0完全不透明，0.0f完全透明
设置黑暗度
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之间，0.0f完全不暗，1.0f全暗
设置背景模糊
getWindow().setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
//调用浏览器
Uri uri = Uri.parse("");
Intent it = new Intent(Intent.ACTION_VIEW,uri);
startActivity(it);
//显示某个坐标在地图上
Uri uri = Uri.parse("geo:38.899533,-77.036476");
Intent it = new Intent(Intent.Action_VIEW,uri);
startActivity(it);
//显示路径
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);
//拨打电话
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" /> 这个权限到androidmanifest.xml
//发送短信或彩信
Intent it = new Intent(Intent.ACTION_VIEW);
it.putExtra("sms_body", "The SMS text");
it.setType("vnd.android-dir/mms-sms");
startActivity(it);
//发送短信
Uri uri = Uri.parse("smsto:10086");
Intent it = new Intent(Intent.ACTION_SENDTO, uri);
it.putExtra("sms_body", "cwj");
startActivity(it);
//发送彩信
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);
//发送邮件
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"));
//播放媒体文件
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);
//卸载APK
Uri uri = Uri.fromParts("package", strPackageName, null);
Intent it = new Intent(Intent.ACTION_DELETE, uri);
startActivity(it);
//卸载apk 2
Uri uninstallUri = Uri.fromParts("package", "xxx", null);
returnIt = new Intent(Intent.ACTION_DELETE, uninstallUri);
//安装APK
Uri installUri = Uri.fromParts("package", "xxx", null);
returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);
//播放音乐
Uri playUri = Uri.parse("file:///sdcard/download/sth.mp3");
returnIt = new Intent(Intent.ACTION_VIEW, playUri);
//发送附近
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上某个应用信，pkg_name就是应用的packageName
Uri uri = Uri.parse("market://search?q=pname:pkg_name");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//market上某个应用信息，app_id可以通过www网站看下
Uri uri = Uri.parse("market://details?id=app_id");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//调用搜索
Intent intent = new Intent();
intent.setAction(Intent.ACTION_WEB_SEARCH);
intent.putExtra(SearchManager.QUERY,"android123")
startActivity(intent);
//调用分享菜单
Intent intent=new Intent(Intent.ACTION_SEND);
intent.setType("text/plain"); //分享的数据类型
intent.putExtra(Intent.EXTRA_SUBJECT, "subject"); //主题
intent.putExtra(Intent.EXTRA_TEXT, "content"); //内容
startActivity(Intent.createChooser(intent, "title")); //目标应用选择对话框的标题
获取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);
}