Android相关常用API……

Android相关常用API……

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:[email protected]"); 
Intent it = new Intent(Intent.ACTION_SENDTO, uri); 
startActivity(it); 

Intent it = new Intent(Intent.ACTION_SEND); 
it.putExtra(Intent.EXTRA_EMAIL, [email protected]); 
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={"[email protected]"}; 
String[] ccs={"[email protected]"}; 
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);

}