安卓亮度調節(jié)代碼

1、package com.kunge.powermanage.tools;public class Light package com.example.bs; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import android.app.Activity; import android.content.ContentResolver; import android.content.Context; imp

2、ort android.database.ContentObserver; import android.os.Bundle; import android.os.Handler; import android.os.PowerManager; import vider.Settings; import vider.Settings.SettingNotFoundException; import android.view.View; import android.view.View.OnClickListener; import android.w

3、idget.Button; import android.widget.Toast; public class BrightnessSwitch extends Activity implements OnClickListener private Button mBrightness; private static final int LIGHT_NORMAL = 64; private static final int LIGHT_50_PERCENT = 127; private static final int LIGHT_75_PERCENT = 191; private stati

4、c final int LIGHT_100_PERCENT = 255; private static final int LIGHT_AUTO = 0; private static final int LIGHT_ERR = -1; private BrightObserver mBrightObserver; private PowerManager mPowerManager; /* Called when the activity is first created. */ Override public void onCreate(Bundle savedInstanceState)

5、 super.onCreate(savedInstanceState); setContentView(R.layout.main); mPowerManager = (PowerManager)getSystemService(Context.POWER_SERVICE); mBrightObserver = new BrightObserver(new Handler(); mBrightness = (Button)findViewById(R.id.bright); refreshButton(); mBrightness.setOnClickListener(this); Overr

6、ide protected void onDestroy() / TODO Auto-generated method stub super.onDestroy(); mBrightObserver.stopObserver(); Override protected void onResume() / TODO Auto-generated method stub super.onResume(); mBrightObserver.startObserver(); /更新按鈕 private void refreshButton() switch (getBrightStatus() cas

7、e LIGHT_NORMAL: mBrightness.setText(R.string.light_50percent); break; case LIGHT_50_PERCENT: mBrightness.setText(R.string.light_75percent); break; case LIGHT_75_PERCENT: mBrightness.setText(R.string.light_100percent); break; case LIGHT_100_PERCENT: mBrightness.setText(R.string.light_auto); break; ca

8、se LIGHT_AUTO: mBrightness.setText(R.string.light_normal); break; case LIGHT_ERR: mBrightness.setText(R.string.light_err); break; /得到當前亮度值狀態(tài) private int getBrightStatus() / TODO Auto-generated method stub int light = 0; boolean auto = false; ContentResolver cr = getContentResolver(); try auto = Sett

9、ings.System.getInt(cr, Settings.System.SCREEN_BRIGHTNESS_MODE) = Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC; if (!auto) light = vider.Settings.System.getInt(cr, Settings.System.SCREEN_BRIGHTNESS, -1); if (light > 0 && light <= LIGHT_NORMAL) return LIGHT_NORMAL; else if

10、 (light > LIGHT_NORMAL && light <= LIGHT_50_PERCENT) return LIGHT_50_PERCENT; else if (light > LIGHT_50_PERCENT && light <= LIGHT_75_PERCENT) return LIGHT_75_PERCENT; else if (light > LIGHT_75_PERCENT && light <= LIGHT_100_PERCENT) return LIGHT_100_PERCENT;

11、else return LIGHT_AUTO; catch (SettingNotFoundException e1) / TODO Auto-generated catch block e1.printStackTrace(); return LIGHT_ERR; private void setBrightStatus() int light = 0; switch (getBrightStatus() case LIGHT_NORMAL: light = LIGHT_50_PERCENT - 1; break; case LIGHT_50_PERCENT: light = LIGHT_7

12、5_PERCENT - 1; break; case LIGHT_75_PERCENT: light = LIGHT_100_PERCENT - 1; break; case LIGHT_100_PERCENT: startAutoBrightness(getContentResolver(); break; case LIGHT_AUTO: light = LIGHT_NORMAL - 1; stopAutoBrightness(getContentResolver(); break; case LIGHT_ERR: light = LIGHT_NORMAL - 1; break; setL

13、ight(light); setScreenLightValue(getContentResolver(), light); /*因為PowerManager提供的函數(shù)setBacklightBrightness接口是隱藏的， * 所以在基于第三方開發(fā)調用該函數(shù)時，只能通過反射實現(xiàn)在運行時調用 */ private void setLight(int light) try /得到PowerManager類對應的Class對象 Class<?> pmClass = Class.forName(mPowerManager.getClass().getName(); /得到PowerMa

14、nager類中的成員mService（mService為PowerManagerService類型） Field field = pmClass.getDeclaredField("mService"); field.setAccessible(true); /實例化mService Object iPM = field.get(mPowerManager); /得到PowerManagerService對應的Class對象 Class<?> iPMClass = Class.forName(iPM.getClass().getName(); /*得到Power

15、ManagerService的函數(shù)setBacklightBrightness對應的Method對象， * PowerManager的函數(shù)setBacklightBrightness實現(xiàn)在PowerManagerService中 */ Method method = iPMClass.getDeclaredMethod("setBacklightBrightness", int.class); method.setAccessible(true); /調用實現(xiàn)PowerManagerService的setBacklightBrightness method.invoke(i

16、PM, light); catch (ClassNotFoundException e) / TODO Auto-generated catch block e.printStackTrace(); catch (NoSuchFieldException e) / TODO Auto-generated catch block e.printStackTrace(); catch (IllegalArgumentException e) / TODO Auto-generated catch block e.printStackTrace(); catch (IllegalAccessExce

17、ption e) / TODO Auto-generated catch block e.printStackTrace(); catch (NoSuchMethodException e) / TODO Auto-generated catch block e.printStackTrace(); catch (InvocationTargetException e) / TODO Auto-generated catch block e.printStackTrace(); Override public void onClick(View v) / TODO Auto-generated

18、 method stub setBrightStatus(); /啟動自動調節(jié)亮度 public void startAutoBrightness(ContentResolver cr) Settings.System.putInt(cr, Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC); /關閉自動調節(jié)亮度 public void stopAutoBrightness(ContentResolver cr) Settings.System.putInt(cr,

19、Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); /設置改變亮度值 public void setScreenLightValue(ContentResolver resolver, int value) vider.Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS, value); private class BrightObserver extends ContentObserver ContentResolver mResolver; public BrightObserver(Handler handler) super(handler); mResolver = getContentResolver(); Override public void onChange(boolean selfChange) / TODO Auto-generated method stub supe