Android开发常用经典代码段集锦

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

//创建电话管理
TelephonyManager tm = (TelephonyManager)
//与手机建立连接
activity.getSystemService(Context.TELEPHONY_SERVICE);
//获取手机号码
String phoneId = tm.getLine1Number();
//记得在manifest file中添加
<uses-permission
android:name="android.permission.READ_PHONE_STATE" />
//程序在模拟器上无法实现，必须连接手机

// 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);

/** 全屏设置，隐藏窗口所有装饰 */
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);

<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>

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

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

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

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;
}

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);
}

Intent i = new Intent(Intent.ACTION_SEND);
//i.setType("text/plain"); //模拟器请使用这行
i.setType("message/rfc822") ; // 真机上使用这行
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."));

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

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

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;
}

/** 获取存储卡路径 */
File sdcardDir=Environment.getExternalStorageDirectory();
/** StatFs 看文件系统空间使用情况 */
StatFs statFs=new StatFs(sdcardDir.getPath());
/** Block 的 size*/
Long blockSize=statFs.getBlockSize();
/** 总 Block 数量 */
Long totalBlocks=statFs.getBlockCount();
/** 已使用的 Block 数量 */
Long availableBlocks=statFs.getAvailableBlocks();

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;
}

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

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);
}