Android 获取屏幕信息

//获得手机的宽度和高度像素单位为px

// 通过WindowManager获取  

       //必须在Activity中获取，即使使用Context 也必须强转为Activity

public void getScreenDensity_ByWindowManager(){
DisplayMetrics mDisplayMetrics = new DisplayMetrics();//屏幕分辨率容器
getWindowManager().getDefaultDisplay().getMetrics(mDisplayMetrics);
int width = mDisplayMetrics.widthPixels;
int height = mDisplayMetrics.heightPixels;
float density = mDisplayMetrics.density;
int densityDpi = mDisplayMetrics.densityDpi;
Log.d(TAG,"Screen Ratio: ["+width+"x"+height+"],density="+density+",densityDpi="+densityDpi);
Log.d(TAG,"Screen mDisplayMetrics: "+mDisplayMetrics);

}

// 通过Resources获取  

       // 不需要在Activity中使用， Application 和Activity中的Context 均可以使用此函数

public void getScreenDensity_ByResources(){
DisplayMetrics mDisplayMetrics = getResources().getDisplayMetrics();  
int width = mDisplayMetrics.widthPixels;
int height = mDisplayMetrics.heightPixels;
float density = mDisplayMetrics.density;
int densityDpi = mDisplayMetrics.densityDpi;
Log.d(TAG,"Screen Ratio: ["+width+"x"+height+"],density="+density+",densityDpi="+densityDpi);
Log.d(TAG,"Screen mDisplayMetrics: "+mDisplayMetrics);

}
// 获取屏幕的默认分辨率  
public void getDefaultScreenDensity(){
Display mDisplay = getWindowManager().getDefaultDisplay();  
int width = mDisplay.getWidth();
int height = mDisplay.getHeight();
Log.d(TAG,"Screen Default Ratio: ["+width+"x"+height+"]");
Log.d(TAG,"Screen mDisplay: "+mDisplay);
}