適用於Android屏幕尺寸的代碼不起作用

Question

我已經嘗試了下面的代碼來找出屏幕尺寸，但沒有一個適合我。界面對於相同屏幕尺寸和相同尺寸的不同設備而言也不成比例。我沒有實際的設備，我正在使用由AVD提供的屏幕尺寸/尺寸的設備。代碼適用於尺寸，但不能提供正確的屏幕尺寸。它爲4英寸屏幕計算的屏幕尺寸是3.9英寸（圓形圖形），而3.7英寸屏幕的屏幕尺寸也是3.9英寸。 Nexus S（4「，480x800：hdpi）的界面代碼不適用於4」WVGA（480x800：hdpi），其中兩者的屏幕尺寸和尺寸均相同。

能否請你幫我解決這個問題。

DisplayMetrics dm = new DisplayMetrics(); 
    getWindowManager().getDefaultDisplay().getMetrics(dm); 
    int widthInch=dm.widthPixels; 
    int heightInch=dm.heightPixels; 
    int dens=dm.densityDpi; 
    double wi=(double)widthInch/(double)dens; 
    double hi=(double)heightInch/(double)dens; 
    double x = Math.pow(wi,2); 
    double y = Math.pow(hi,2); 
    double screenInches = Math.sqrt(x+y); 
    screenInches = (double)Math.round(screenInches * 10)/10; 

    int widthPix = (int) Math.ceil(dm.widthPixels * (dm.densityDpi/160.0)); 

    Toast.makeText(getApplicationContext(), width+"*"+height+" - "+widthPix+ 
      " - " +screenInches, 
      Toast.LENGTH_LONG).show(); 

    //================================================================ 
    DisplayMetrics metrics = new DisplayMetrics(); 
    getWindowManager().getDefaultDisplay().getMetrics(metrics); 
    //get density per inch for example: 120 , 160 , 240 
    float mXDpi = metrics.xdpi; // 160 The exact physical pixels per inch of the screen in the X dimension. 
    float mYDpi = metrics.ydpi; 

    //density 
    int nDensity = metrics.densityDpi; // 160 screen density expressed as dots-per-inch 

      float mMetersToPixelsX = mXDpi/0.0254f; // 1 inch == 0.0254 metre 
      float mMetersToPixelsY = mYDpi/0.0254f; 

    //Resolution 
    //The total number of physical pixels on a screen. 
    int wPix = metrics.widthPixels; // 320 The absolute width of the display in pixels. 
    int hPix = metrics.heightPixels; // 480 The absolute height of the display in pixels. 
    int nWidthDisplay = (wPix < hPix)? wPix : hPix; 

    float nWidthScreenInInch = wPix/mXDpi; //320/160 == 2.0 in inch. 
    float nHeightScreenInInch = hPix/mYDpi; //480/160 == 3.0 in inch. 

    double screenInches = Math.sqrt(nHeightScreenInInch*nHeightScreenInInch + 
      nWidthScreenInInch * nWidthScreenInInch); 

    screenInches = (double)Math.round(screenInches * 10)/10; 

    Toast.makeText(getApplicationContext(),"Screen size: "+screenInches, 
      Toast.LENGTH_LONG).show(); 

    //================================================================ 
    DisplayMetrics metrics=new DisplayMetrics(); 
    getWindowManager().getDefaultDisplay().getMetrics(metrics); 

    float hgt=metrics.heightPixels/metrics.xdpi; 
    float wdth=metrics.widthPixels/metrics.ydpi; 
    double screenInches = FloatMath.sqrt(hgt*hgt+wdth*wdth); 
    screenInches = (double)Math.round(screenInches * 10)/10; 

    Toast.makeText(getApplicationContext(),width+"*"+height+" - "+screenInches, 
       Toast.LENGTH_LONG).show(); 
    //=============================================================== 

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Answer 1

DisplayMetrics metrics = new DisplayMetrics(); 
    getWindowManager().getDefaultDisplay().getMetrics(metrics); 

    final int height = metrics.heightPixels; 
    int width = metrics.widthPixels;