Android屏幕亮度调节

SeekBar seekBar = (SeekBar) findViewById(R.id.seekBar);

		// 进度条绑定最大亮度，255是最大亮度
		seekBar.setMax(255);
		// 取得当前亮度
		int normal = Settings.System.getInt(getContentResolver(),
				Settings.System.SCREEN_BRIGHTNESS, 255);
		// 进度条绑定当前亮度
		seekBar.setProgress(normal);

		seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

			@Override
			public void onStopTrackingTouch(SeekBar seekBar) {
				// 取得当前进度
				int tmpInt = seekBar.getProgress();

				// 当进度小于80时，设置成80，防止太黑看不见的后果。
				if (tmpInt < 80) {
					tmpInt = 80;
				}

				// 根据当前进度改变亮度
				Settings.System.putInt(getContentResolver(),
						Settings.System.SCREEN_BRIGHTNESS, tmpInt);
				tmpInt = Settings.System.getInt(getContentResolver(),
						Settings.System.SCREEN_BRIGHTNESS, -1);
				WindowManager.LayoutParams wl = getWindow().getAttributes();

				float tmpFloat = (float) tmpInt / 255;
				if (tmpFloat > 0 && tmpFloat <= 1) {
					wl.screenBrightness = tmpFloat;
				}
				getWindow().setAttributes(wl);

			}

			@Override
			public void onStartTrackingTouch(SeekBar seekBar) {
				// TODO Auto-generated method stub
			}

			@Override
			public void onProgressChanged(SeekBar seekBar, int progress,
					boolean fromUser) {
				// TODO Auto-generated method stub
			}
		});