Android 代码片段

1、屏幕大小

方法一：
WindowManager windowManager = getWindowManager();
Display display = windowManager.getDefaultDisplay();

方法二：
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);

2、监听文件：android.os.FileObserver

3、设置主题实现没有标题栏或者全屏显示：

            android:theme="@android:style/Theme.Black.NoTitleBar"
            android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
            android:theme="@android:style/Theme.Light.NoTitleBar"
            android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen"
            android:theme="@android:style/Theme.NoTitleBar"
            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

 4、代码实现没有标题栏或者全屏显示：

        getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams. FLAG_FULLSCREEN);

5、图片倒影：

	public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {

		int reflectionGap = 1;
		int w = bitmap.getWidth();
		int h = bitmap.getHeight();
		Matrix matrix = new Matrix();
		matrix.preScale(1, -1);
		Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, h / 2, w,
				h / 2, matrix, false);
		Bitmap bitmapWithReflection = Bitmap.createBitmap(w, (h + h / 2),
				Config.ARGB_8888);
		Canvas canvas = new Canvas(bitmapWithReflection);
		canvas.drawBitmap(bitmap, 0, 0, null);
		Paint deafalutPaint = new Paint();
		canvas.drawRect(0, h, w, h + reflectionGap, deafalutPaint);
		canvas.drawBitmap(reflectionImage, 0, h + reflectionGap, null);
		Paint paint = new Paint();
		LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
				bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff,
				0x00ffffff, TileMode.CLAMP);
		paint.setShader(shader);
		paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
		canvas.drawRect(0, h, w, bitmapWithReflection.getHeight()
				+ reflectionGap, paint);
		return bitmapWithReflection;

	}

n、不断添加中...