关于 Window.setAttributes(LayoutParams a) 的一些操作全屏 ,设置亮度关闭键盘灯等

最新推荐文章于 2024-07-12 16:37:32 发布

原创最新推荐文章于 2024-07-12 16:37:32 发布 · 4.3k 阅读

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本文介绍了一个Android应用示例，展示了如何通过编程方式调整设备的屏幕亮度和按键背光亮度。具体包括设置亮度的方法、如何使屏幕保持常亮等功能，并提供了一段完整的Java代码实现。

package com.example.testkeylight;

import android.app.Activity;
import android.os.Bundle;
import android.provider.Settings.SettingNotFoundException;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;

/**
 * http://developer.android.com/reference/android/view/WindowManager.
 * LayoutParams.html#BRIGHTNESS_OVERRIDE_OFF public static final float
 * BRIGHTNESS_OVERRIDE_OFF
 * 
 * Added in API level 8 Value for screenBrightness and buttonBrightness
 * indicating that the screen or button backlight brightness should be set to
 * the lowest value when this window is in front.
 * 
 * Constant Value: 0.0
 * 
 * @author sfshine 2013-4-27 下午3:40:32
 */
public class MainActivity extends Activity {

	private Window win;
	private LayoutParams winParams;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		win = getWindow();
		winParams = win.getAttributes();
		setLight();

	}

	public void openKeyLight(View view) {
		winParams.buttonBrightness = WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_FULL;
		win.setAttributes(winParams);
	}

	public void closeKeyLight(View view) {
		winParams.buttonBrightness = WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_OFF;

		win.setAttributes(winParams);

	}

	// 设置屏幕亮度
	public void setLight() {
		int curBrightnessValue = 100;
		try {
			curBrightnessValue = android.provider.Settings.System.getInt(
					getContentResolver(),
					android.provider.Settings.System.SCREEN_BRIGHTNESS);
		} catch (SettingNotFoundException e) {
			e.printStackTrace();
		}
		Log.e("TAG", curBrightnessValue + " ");

		WindowManager.LayoutParams layoutParams = win.getAttributes();
		layoutParams.screenBrightness = 0.01f; // 0 - 1 中间
												// 但是似乎在0.01一下才能看出明显的屏幕变暗
		win.setAttributes(layoutParams);

	}

	// 设置常亮
	public void setAllLight() {

		win.setFlags(WindowManager.LayoutParams.MATCH_PARENT,
				WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
	}
}