Old Deng's android Study Notes (2)-Android gets screen resolutions in N ways, android-android

Old Deng's android Study Notes (2)-Android gets screen resolutions in N ways, android-android

Android gets the screen resolution

Method 1: the simplest method

12	int screenWidth  = getWindowManager().getDefaultDisplay().getWidth();  int screenHeight = getWindowManager().getDefaultDisplay().getHeight();

It can be done in two simple sentences. Try to use this method for testing first. If this method cannot pass the test, replace the following method.

Method 2: obtain a general algorithm for screen size comparison

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DisplayMetrics dm = new DisplayMetrics();  dm = getResources().getDisplayMetrics();  float density  = dm.density;        int densityDPI = dm.densityDpi;  float xdpi = dm.xdpi;             float ydpi = dm.ydpi;  screenWidth  = dm.widthPixels;  screenHeight = dm.heightPixels;

This method supports most mobile phones. In general, if the above method fails, you can test it by modifying the method. It is best to do this...

Method 3:

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dm = new DisplayMetrics();  getWindowManager().getDefaultDisplay().getMetrics(dm);  density  = dm.density;  densityDPI = dm.densityDpi; xdpi = dm.xdpi;           ydpi = dm.ydpi;  int screenWidthDip = dm.widthPixels; int screenHeightDip = dm.heightPixels;  screenWidth  = (int)(dm.widthPixels * density + 0.5f);  screenHeight = (int)(dm.heightPixels * density + 0.5f);

 

This method is suitable for special models, such as i9000. It can be used for good identification and verification. The principle is to multiply the result of method 1 and method 2 by the density (when the density is greater than 1, The targetSdkVersion must be set to 4-9)

 

Note: currently, the fragmentation of android is very serious, and many methods cannot be used.

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