试试这个code。你可以在屏幕英寸

 字符串inputSystem;
    inputSystem = android.os.Build.ID;
    Log.d（海，inputSystem）;
    显示显示= getWindowManager（）getDefaultDisplay（）。
    INT宽度= display.getWidth（）; //德precated
    INT高= display.getHeight（）; //德precated
    Log.d（海，宽+）;
    Log.d（海，高度+）;
    DisplayMetrics DM =新DisplayMetrics（）;
    。getWindowManager（）getDefaultDisplay（）getMetrics（DM）。
    双X = Math.pow（宽度/ dm.xdpi，2）;
    双Y = Math.pow（身高/ dm.ydpi，2）;
    双screenInches =的Math.sqrt（X + Y）;
    Log.d（海，屏幕英寸：+ screenInches +）;
 

I would like to get to detect whether the given device is a tablet or phone in android.I have tried the two in the simulator but none worked. Both are here:

First

if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) 
{
    //code
}

Second

    private boolean isTabletDevice() 
{         
    if (android.os.Build.VERSION.SDK_INT >= 11) 
    { 
    // honeycomb                    
    // test screen size, use reflection because isLayoutSizeAtLeast is only available since 11     
    Configuration con = getResources().getConfiguration();              
    try {                     
            Method mIsLayoutSizeAtLeast = con.getClass().getMethod("isLayoutSizeAtLeast");    
            Boolean r = (Boolean) mIsLayoutSizeAtLeast.invoke(con, 0x00000004); // Configuration.SCREENLAYOUT_SIZE_XLARGE    
            return r;              
        } catch (Exception x)
        {    
            return false;          
        }             
    }            
    return false;                   
}

Try this code. You can get the screen inches

    String inputSystem;
    inputSystem = android.os.Build.ID;
    Log.d("hai",inputSystem);
    Display display = getWindowManager().getDefaultDisplay(); 
    int width = display.getWidth();  // deprecated
    int height = display.getHeight();  // deprecated
    Log.d("hai",width+"");
    Log.d("hai",height+"");
    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);
    double x = Math.pow(width/dm.xdpi,2);
    double y = Math.pow(height/dm.ydpi,2);
    double screenInches = Math.sqrt(x+y);
    Log.d("hai","Screen inches : " + screenInches+"");