获取当前手机屏幕尺寸

屏幕尺寸 指的就是 对角线尺寸

private void setRealDeviceSizeInPixels() {
WindowManager windowManager = mContext.getWindowManager();
Display display = windowManager.getDefaultDisplay();
DisplayMetrics displayMetrics = new DisplayMetrics();
display.getMetrics(displayMetrics);

// since SDK_INT = 1;
mWidthPixels = displayMetrics.widthPixels;
mHeightPixels = displayMetrics.heightPixels;

// includes window decorations (statusbar bar/menu bar)
if (Build.VERSION.SDK_INT >= 14 && Build.VERSION.SDK_INT < 17) {
try {
mWidthPixels = (Integer) Display.class.getMethod("getRawWidth").invoke(display);
mHeightPixels = (Integer) Display.class.getMethod("getRawHeight").invoke(display);
} catch (Exception ignored) {
}
}

// includes window decorations (statusbar bar/menu bar)
if (Build.VERSION.SDK_INT >= 17) {
try {
Point realSize = new Point();
Display.class.getMethod("getRealSize", Point.class).invoke(display, realSize);
mWidthPixels = realSize.x;
mHeightPixels = realSize.y;
} catch (Exception ignored) {
}
}

double x = Math.pow(mWidthPixels / displayMetrics.xdpi, 2);
double y = Math.pow(mHeightPixels / displayMetrics.ydpi, 2);
double screenInches = Math.sqrt(x + y);
Log.i("LogInfo", "Screen inches : " + screenInches);

我打印过这个值，有细微差别，不影响使用。建议和产品经理确认。