Android discussion --- getting the phone screen size

 

Android discussion --- getting the phone screen size

SurfaceView simple example

Go to Android --- UI --- ZoomControls to zoom in and out images

For more information, here is a summary of the operations on the mobile phone screen in android:

1. Get the screen resolution (because when processing the display in android, you need to go to different la s or display different materials according to the screen resolution)

Java code

// Obtain it through WindowManager

DisplayMetrics dm = new DisplayMetrics ();

GetWindowManager (). getDefaultDisplay (). getMetrics (dm );

System. out. println ("heigth:" + dm. heightPixels );

System. out. println ("width:" + dm. widthPixels );

// Obtain from Resources

DisplayMetrics dm2 = getResources (). getDisplayMetrics ();

System. out. println ("heigth1:" + dm2.heightPixels );

System. out. println ("width1:" + dm2.widthPixels );

// Obtain the default screen resolution

Display display = getWindowManager (). getDefaultDisplay ();

System. out. println ("width-display:" + display. getWidth ());

System. out. println ("heigth-display:" + display. getHeight ());

// Obtain it through WindowManager

DisplayMetrics dm = new DisplayMetrics ();

GetWindowManager (). getDefaultDisplay (). getMetrics (dm );

System. out. println ("heigth:" + dm. heightPixels );

System. out. println ("width:" + dm. widthPixels );

// Obtain from Resources

DisplayMetrics dm2 = getResources (). getDisplayMetrics ();

System. out. println ("heigth1:" + dm2.heightPixels );

System. out. println ("width1:" + dm2.widthPixels );

// Obtain the default screen resolution

Display display = getWindowManager (). getDefaultDisplay ();

System. out. println ("width-display:" + display. getWidth ());

System. out. println ("heigth-display:" + display. getHeight ());

2. Remove the screen title and full screen display

Java code

// Remove the title

RequestWindowFeature (Window. FEATURE_NO_TITLE );

// Set full screen

GetWindow (). setFlags (WindowManager. LayoutParams. FLAG_FULLSCREEN,

WindowManager. LayoutParams. FLAG_FULLSCREEN );

// Remove the title

RequestWindowFeature (Window. FEATURE_NO_TITLE );

// Set full screen

GetWindow (). setFlags (WindowManager. LayoutParams. FLAG_FULLSCREEN,

WindowManager. LayoutParams. FLAG_FULLSCREEN );

3. Set the screen direction

Configure Activity attributes in the Manifest. xml file

Xml Code

<Activity android: name = ". AnimateActivity" android: label = "@ string/app_name"

Android: screenOrientation = "landscape"> <! -- Landscape portrait -->

<Intent-filter>

<Action android: name = "android. intent. action. MAIN"/>

<Category android: name = "android. intent. category. LAUNCHER"/>

</Intent-filter>

</Activity>

<Activity android: name = ". AnimateActivity" android: label = "@ string/app_name"

Android: screenOrientation = "landscape"> <! -- Landscape portrait -->

<Intent-filter>

<Action android: name = "android. intent. action. MAIN"/>

<Category android: name = "android. intent. category. LAUNCHER"/>

</Intent-filter>

</Activity>

It is usually controlled in the onCreate and onDestroy methods in the Activity, because when the screen direction changes,

The system restarts the Activity. Therefore, you need to save the relevant data before the Activity is destroyed to facilitate the next onCreate method.

Reload and update the screen Layout

Java code

Public void onCreate (Bundle savedInstanceState ){

// Force horizontal screen

SetRequestedOrientation (ActivityInfo. SCREEN_ORIENTATION_LANDSCAPE );

// TODO updates the screen Layout

}

 

Public void onDestroy (){

If (getRequestedOrientation () =

ActivityInfo. SCREEN_ORIENTATION_LANDSCAPE ){

// Save data

} Else if (getRequestedOrientation () =

ActivityInfo. SCREEN_ORIENTATION_PORTRAIT ){

// Save data

}

}