Android应用层获取设备屏幕分辨率的方法

直接上代码：

        DisplayMetrics dm = new DisplayMetrics();
        Display display = getWindowManager().getDefaultDisplay();
        display.getRealMetrics(dm);//display.getMetrics(dm);
        Log.i("getScreenSize","width:"+dm.widthPixels+",height:"+dm.heightPixels);

注意： 1.使用display.getMetrics(dm)和使用display.getRealMetrics(dm)获取到结果不一样。

/**
     * Gets display metrics based on the real size of this display.
     * 

     * The size is adjusted based on the current rotation of the display.
     * 

     * The real size may be smaller than the physical size of the screen when the
     * window manager is emulating a smaller display (using adb shell wm size).
     * 
     *
     * @param outMetrics A {@link DisplayMetrics} object to receive the metrics.
     */
    public void getRealMetrics(DisplayMetrics outMetrics) {
        synchronized (this) {
            updateDisplayInfoLocked();
            mDisplayInfo.getLogicalMetrics(outMetrics,
                    CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO, null);
        }
    }

    /**
     * Gets display metrics that describe the size and density of this display.
     * The size returned by this method does not necessarily represent the
     * actual raw size (native resolution) of the display.
     * 

     * 1. The returned size may be adjusted to exclude certain system decor elements
     * that are always visible.
     * 

     * 2. It may be scaled to provide compatibility with older applications that
     * were originally designed for smaller displays.
     * 

     * 3. It can be different depending on the WindowManager to which the display belongs.
     * 

     * - If requested from non-Activity context (e.g. Application context via
     * {@code (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE)})
     * metrics will report the size of the entire display based on current rotation and with
     * subtracted system decoration areas.
     * 

     * - If requested from activity (either using {@code getWindowManager()} or
     * {@code (WindowManager) getSystemService(Context.WINDOW_SERVICE)}) resulting metrics will
     * correspond to current app window metrics. In this case the size can be smaller than physical
     * size in multi-window mode.
     * 
     *
     * @param outMetrics A {@link DisplayMetrics} object to receive the metrics.
     */
    public void getMetrics(DisplayMetrics outMetrics) {
        synchronized (this) {
            updateDisplayInfoLocked();
            mDisplayInfo.getAppMetrics(outMetrics, mDisplayAdjustments);
        }
    }