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How to add or remove widgets home screen android 4


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How to add or remove widgets home screen Android 4.

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Leap year date time Java Android example | leap-year-date-time-java-android-example

GregorianCalendar cal = new GregorianCalendar(); Boolean b = cal.isLeapYear(2012); // true, Android example.

public class MainActivity extends Activity {
TextView txtV;
	Context cntx;
    public void onCreate(Bundle savedInstanceState) {
        txtV = (TextView)findViewById(R.id.idLabel);
        cntx = this;
        StringBuilder strBuild = new StringBuilder();
         GregorianCalendar cal = new GregorianCalendar();
         Boolean b = cal.isLeapYear(2012); // true
         strBuild.append("Is leap year 2012? " + b + "

"); b = cal.isLeapYear(2014); // false strBuild.append("Is leap year 2014? " + b + "
"); txtV.setText(strBuild); } }

Android emulator freezes at startup create new virtual device | android-emulator-freezes-at-startup-create-new-virtual-device

If Android emulator freezes at startup, try create new virtual device with smaller memory and cpu usage, or select older version of Android, or buy new pc with higher performance.

  1. open AVD MANAGER

  2. press Create Virtual Device

  3. select Device with small memory usage (e.g. 480x800 of resolution) - Next

  4. check - Show downloadable ....

  5. Download - lower version of system Android, select, press - Next

  6. check data, Show Advanced Settings, check Use host... and press Finish


No title bar Android application without titlebar style Theme NoTitleBar Android example | no-title-bar-android-application-without-titlebar-style-theme-notitlebar-android-example

Set in AndroidManifest.xml android:theme="@android:style/Theme.NoTitleBar" AndroidManifest.xml example source code.

<manifest xmlns:android="//schemas.android.com/apk/res/android"
    <application android:label="My app">
      <activity android:name="NoTitleBar"
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />


Android Emulator PC keyboard shortcuts | android-emulator-pc-keyboard-shortcuts

Basic shortcuts for Android Emulator.

Emulated Device Key Keyboard Key
Menu (left softkey) F2 or Page-up button
Star (right softkey) Shift-F2 or Page Down
Back ESC
Call/dial button F3
Hangup/end call button F4
Search F5
Power button F7
Audio volume up button KEYPAD_PLUS, Ctrl-5
Audio volume down button KEYPAD_MINUS, Ctrl-F6
Camera button Ctrl-KEYPAD_5, Ctrl-F3
Switch to previous layout orientation (for example, portrait, landscape) KEYPAD_7, Ctrl-F11
Switch to next layout orientation (for example, portrait, landscape) KEYPAD_9, Ctrl-F12
Toggle cell networking on/off F8
Toggle code profiling F9 (only with -trace startup option)
Toggle fullscreen mode Alt-Enter
Toggle trackball mode F6
Enter trackball mode temporarily (while key is pressed) Delete
DPad left/up/right/down KEYPAD_4/8/6/2
DPad center click KEYPAD_5
Onion alpha increase/decrease KEYPAD_MULTIPLY(*) / KEYPAD_DIVIDE(/)

More about Android Emulator

Delete Bitmap Android Example | delete-bitmap-android-example

If some memory leak - problem try release of memory used of a big Bitmap what already not to need;
Bitmpap bmp; // not null
bmp = null;

final boolean bmpIsRecycled = bmp.isRecycled()
// Returns true if this bitmap has been recycled.

Free the native object associated with this bitmap, and clear the reference to the pixel data. This will not free the pixel data synchronously; it simply allows it to be garbage collected if there are no other references. The bitmap is marked as "dead”, meaning it will throw an exception if getPixels() or setPixels() is called, and will draw nothing. This operation cannot be reversed, so it should only be called if you are sure there are no further uses for the bitmap. This is an advanced call, and normally need not be called, since the normal GC process will free up this memory when there are no more references to this bitmap.

Editace: 2013-12-09 10:08:56
Počet článků v kategorii: 397

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