1、圖片旋轉

Bitmap bitmapOrg = BitmapFactory.decodeResource(this.getContext().getResources(), R.drawable.moon); Matrix matrix = new Matrix(); matrix.postRotate(-90);//旋轉的角度Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,bitmapOrg.getWidth(), bitmapOrg.getHeight(), matrix, true); BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);

2、獲取手機號碼

//創建電話管理TelephonyManager tm = (TelephonyManager)//與手機建立連接 activity.getSystemService(Context.TELEPHONY_SERVICE);//獲取手機號碼String phoneId = tm.getLine1Number();//記得在manifest file中添加<uses-permission android:name="android.permission.READ_PHONE_STATE" />//程序在模擬器上無法實現，必須連接手機

3.格式化string.xml 中的字符串

// in strings.xml.. <string name="my_text">Thanks for visiting %s. You age is %d!</string>// and in the java code: String.format(getString(R.string.my_text), "oschina", 33);

4、android設置全屏的方法

A.在java代碼中設置

/** 全屏設置，隱藏窗口所有裝飾 */ requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

B、在AndroidManifest.xml中配置

<activity android:name=".Login.NetEdit" android:label="@string/label_net_Edit" android:screenOrientation="portrait" android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"><intent-filter><action android:name="android.intent.Net_Edit" /><category android:name="android.intent.category.DEFAULT" /></intent-filter> </activity>

5、設置Activity為Dialog的形式

在AndroidManifest.xml中配置Activity節點是配置theme如下：

android:theme="@android:style/Theme.Dialog"

6、檢查當前網絡是否連上

ConnectivityManager con=(ConnectivityManager)getSystemService(Activity.CONNECTIVITY_SERVICE); boolean wifi=con.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting(); boolean internet=con.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnectedOrConnecting();

在AndroidManifest.xml 增加權限：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

7、檢測某個Intent是否有效

public static boolean isIntentAvailable(Context context, String action) {final PackageManager packageManager = context.getPackageManager();final Intent intent = new Intent(action);List<ResolveInfo> list =packageManager.queryIntentActivities(intent,PackageManager.MATCH_DEFAULT_ONLY);return list.size() > 0; }

8、android 撥打電話

try {Intent intent = new Intent(Intent.ACTION_CALL);intent.setData(Uri.parse("tel:+110"));startActivity(intent); } catch (Exception e) {Log.e("SampleApp", "Failed to invoke call", e); }

9、android中發送Email

Intent i = new Intent(Intent.ACTION_SEND); //i.setType("text/plain"); //模擬器請使用這行 i.setType("message/rfc822") ; // 真機上使用這行 i.putExtra(Intent.EXTRA_EMAIL, new String[]{"test@gmail.com","test@163.com}); i.putExtra(Intent.EXTRA_SUBJECT,"subject goes here"); i.putExtra(Intent.EXTRA_TEXT,"body goes here"); startActivity(Intent.createChooser(i, "Select email application."));

10、android中打開瀏覽器

Intent viewIntent = new Intent("android.intent.action.VIEW",Uri.parse("http://vaiyanzi.cnblogs.com"));startActivity(viewIntent);

11、android 獲取設備唯一標識碼

String android_id = Secure.getString(getContext().getContentResolver(), Secure.ANDROID_ID);

12、android中獲取IP地址

public String getLocalIpAddress() {try {for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {NetworkInterface intf = en.nextElement();for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {InetAddress inetAddress = enumIpAddr.nextElement();if (!inetAddress.isLoopbackAddress()) {return inetAddress.getHostAddress().toString();}}}} catch (SocketException ex) {Log.e(LOG_TAG, ex.toString());}return null; }

13、android獲取存儲卡路徑以及使用情況

/** 獲取存儲卡路徑 */ File sdcardDir=Environment.getExternalStorageDirectory(); /** StatFs 看文件系統空間使用情況 */ StatFs statFs=new StatFs(sdcardDir.getPath()); /** Block 的 size*/ Long blockSize=statFs.getBlockSize(); /** 總 Block 數量 */ Long totalBlocks=statFs.getBlockCount(); /** 已使用的 Block 數量 */ Long availableBlocks=statFs.getAvailableBlocks();

14 android中添加新的聯系人

private Uri insertContact(Context context, String name, String phone) {ContentValues values = new ContentValues();values.put(People.NAME, name);Uri uri = getContentResolver().insert(People.CONTENT_URI, values);Uri numberUri = Uri.withAppendedPath(uri, People.Phones.CONTENT_DIRECTORY);values.clear();values.put(Contacts.Phones.TYPE, People.Phones.TYPE_MOBILE);values.put(People.NUMBER, phone);getContentResolver().insert(numberUri, values);return uri; }

15、查看電池使用情況

Intent intentBatteryUsage = new Intent(Intent.ACTION_POWER_USAGE_SUMMARY); startActivity(intentBatteryUsage);

16、獲取進程號

ActivityManager mActivityManager = (ActivityManager) this.getSystemService(ACTIVITY_SERVICE);

List<ActivityManager.RunningAppProcessInfo> mRunningProcess = mActivityManager.getRunningAppProcesses(); int i = 1; for (ActivityManager.RunningAppProcessInfo amProcess : mRunningProcess) { Log.e("homer Application", (i++) + " ?PID = " + amProcess.pid + "; processName = " + amProcess.processName); }

17、查看電池使用情況

Intent intentBatteryUsage = new Intent(Intent.ACTION_POWER_USAGE_SUMMARY); startActivity(intentBatteryUsage);

總結

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