android中屏幕亮度相关设置

测试Activity：

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package com.home.screenbrightness;  
  
import android.app.Activity;  
import android.os.Bundle;  
import android.provider.Settings;  
import android.widget.SeekBar;  
import android.widget.SeekBar.OnSeekBarChangeListener;  
  
public class TestScreenBrightnessActivity extends Activity {  
    private int brightness;  
    private SeekBar seekbar;  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        seekbar = (SeekBar) findViewById(R.id.main_sb);  
        initBrightness();  
        seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {  
  
            @Override  
            public void onStopTrackingTouch(SeekBar seekBar) {  
                brightness = seekBar.getProgress();  
                seekBar.setProgress(brightness);  
                SetAndGetDataUtil.SetData(getApplicationContext(), "test",  
                        "light", brightness + "");  
            }  
  
            @Override  
            public void onStartTrackingTouch(SeekBar seekBar) {  
            }  
  
            @Override  
            public void onProgressChanged(SeekBar seekBar, int progress,  
                    boolean fromUser) {  
                int curProgress = seekBar.getProgress();// 得到当前进度值  
                // 当进度小于70时，设置成70，防止太黑看不见的情况。  
                if (curProgress < 70) {  
                    curProgress = 70;  
                }  
                // 根据当前进度改变屏幕亮度  
                Settings.System.putInt(getContentResolver(),  
                        Settings.System.SCREEN_BRIGHTNESS, curProgress);  
                curProgress = Settings.System.getInt(getContentResolver(),  
                        Settings.System.SCREEN_BRIGHTNESS, -1);  
                BrightnessUtil.setBrightness(TestScreenBrightnessActivity.this,  
                        curProgress);  
                // BrightnessUtil.saveBrightness(TestScreenBrightnessActivity.this,  
                // curProgress);  
            }  
        });  
    }  
  
    /** 
     * 初始化屏幕亮度值 
     */  
    private void initBrightness() {  
        // 如果开启了自动亮度调节，则关闭之  
        if (BrightnessUtil.isAutoBrightness(this)) {  
            BrightnessUtil.stopAutoBrightness(this);  
        }  
        // 读取文件中设置的亮度值  
        String light = SetAndGetDataUtil.GetData(this, "test", "light");  
        if (!"".equals(light)) {  
            brightness = Integer.valueOf(light);  
        } else {  
            brightness = BrightnessUtil.getScreenBrightness(this);  
        }  
        BrightnessUtil.setBrightness(this, brightness);  
        seekbar.setProgress(brightness);  
    }  
}  

存取数据工具类：SetAndGetDataUtil

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package com.home.screenbrightness;  
  
import android.content.Context;  
import android.content.SharedPreferences;  
import android.content.SharedPreferences.Editor;  
  
/** 
 * 保存数据的工具类 
 *  
 * @author Administrator 
 *  
 */  
public class SetAndGetDataUtil {  
    private static SharedPreferences sp;  
  
    @SuppressWarnings("static-access")  
    public static void SetData(Context context, String filename, String key,  
            String value) {  
        sp = context.getSharedPreferences(filename, context.MODE_PRIVATE);  
        Editor editor = sp.edit();  
        editor.putString(key, value);  
        editor.commit();  
    }  
  
    @SuppressWarnings("static-access")  
    public static String GetData(Context context, String filename, String key) {  
        String value = "";  
        sp = context.getSharedPreferences(filename, context.MODE_PRIVATE);  
        value = sp.getString(key, "");  
        return value;  
    }  
}  

屏幕亮度处理工具类：

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package com.home.screenbrightness;  
  
import android.app.Activity;  
import android.content.ContentResolver;  
import android.net.Uri;  
import android.provider.Settings;  
import android.provider.Settings.SettingNotFoundException;  
import android.view.WindowManager;  
  
/** 
 * 处理屏幕亮度的工具类 
 *  
 * @author Administrator 
 *  
 */  
public class BrightnessUtil {  
    /** 
     * 判断是否开启了自动亮度调节 
     *  
     * @param activity 
     * @return 
     */  
    public static boolean isAutoBrightness(Activity activity) {  
        boolean isAutoAdjustBright = false;  
        try {  
            isAutoAdjustBright = Settings.System.getInt(  
                    activity.getContentResolver(),  
                    Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;  
        } catch (SettingNotFoundException e) {  
            e.printStackTrace();  
        }  
        return isAutoAdjustBright;  
    }  
  
    /** 
     * 获取屏幕的亮度 
     *  
     * @param activity 
     * @return 
     */  
    public static int getScreenBrightness(Activity activity) {  
        int brightnessValue = 0;  
        try {  
            brightnessValue = android.provider.Settings.System.getInt(  
                    activity.getContentResolver(),  
                    Settings.System.SCREEN_BRIGHTNESS);  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return brightnessValue;  
    }  
  
    /** 
     * 设置屏幕亮度 
     *  
     * @param activity 
     * @param brightness 
     */  
    public static void setBrightness(Activity activity, int brightness) {  
        WindowManager.LayoutParams lp = activity.getWindow().getAttributes();  
        lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);  
        activity.getWindow().setAttributes(lp);  
    }  
  
    /** 
     * 关闭亮度自动调节 
     *  
     * @param activity 
     */  
    public static void stopAutoBrightness(Activity activity) {  
        Settings.System.putInt(activity.getContentResolver(),  
                Settings.System.SCREEN_BRIGHTNESS_MODE,  
                Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);  
    }  
  
    /** 
     * 开启亮度自动调节 
     *  
     * @param activity 
     */  
  
    public static void startAutoBrightness(Activity activity) {  
        Settings.System.putInt(activity.getContentResolver(),  
                Settings.System.SCREEN_BRIGHTNESS_MODE,  
                Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);  
    }  
  
    /** 
     * 保存亮度设置状态 
     *  
     * @param activity 
     * @param brightness 
     */  
    public static void saveBrightness(Activity activity, int brightness) {  
        Uri uri = android.provider.Settings.System  
                .getUriFor("screen_brightness");  
        ContentResolver resolver = activity.getContentResolver();  
        android.provider.Settings.System.putInt(resolver, "screen_brightness",  
                brightness);  
        resolver.notifyChange(uri, null);  
    }  
  
}  

布局文件：

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    android:gravity="center"  
    android:orientation="vertical" >  
  
    <SeekBar  
        android:id="@+id/main_sb"  
        style="@android:style/Widget.ProgressBar.Horizontal"  
        android:layout_width="match_parent"  
        android:layout_height="wrap_content"  
        android:max="255" />  
  
</LinearLayout>  

记得加上权限：

 
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<uses-permission android:name="android.permission.WRITE_SETTINGS" />  

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android中屏幕亮度相关设置

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