Android Brightness Changing

这内容挺用的，特别是需要调节亮度的程序，自己收藏起来，呵呵。这段代码不只能改变当前的Activity，也可以改变整个System的亮度

代码：

package com.jimmy;
import android.app.Activity;
 import android.os.Bundle;
 import android.provider.Settings;
 import android.view.Window;
 import android.view.WindowManager;
 import android.widget.SeekBar;
 import android.widget.TextView;
 import android.widget.SeekBar.OnSeekBarChangeListener;public class MyActivity extends Activity {
         /** Called when the activity is first created. */
         TextView textView;        @Override
         public void onCreate(Bundle savedInstanceState) {
                 super.onCreate(savedInstanceState);
                 setContentView(R.layout.main);
                 textView = (TextView) findViewById(R.id.MyTextView);
                 updateToggles();
         }

private void updateToggles() {
                 // TODO Auto-generated method stub
                 SeekBar seekBar = (SeekBar) findViewById(R.id.MySeekBar);
                 seekBar.setProgress((int) (android.provider.Settings.System.getInt(
                                 getContentResolver(),
                                 android.provider.Settings.System.SCREEN_BRIGHTNESS, 255) ));
                 seekBar.setOnSeekBarChangeListener(seekListener);
         }        private OnSeekBarChangeListener seekListener = new OnSeekBarChangeListener() {
                public void onProgressChanged(SeekBar seekBar, int progress,
                                 boolean fromUser) {
                         if (fromUser) {
                                 Integer tmpInt = seekBar.getProgress();
                                 System.out.println(tmpInt);
                                 // 51 (seek scale) * 5 = 255 (max brightness)
                                 // Old way
                                 android.provider.Settings.System.putInt(getContentResolver(),
                                                 android.provider.Settings.System.SCREEN_BRIGHTNESS,
                                                 tmpInt); // 0-255
                                 tmpInt = Settings.System.getInt(getContentResolver(),
                                                 Settings.System.SCREEN_BRIGHTNESS, -1);
                                 // Cupcake way..... sucks
                                 WindowManager.LayoutParams lp = getWindow().getAttributes();
                                 // lp.screenBrightness = 1.0f;
                                 // Float tmpFloat = (float)tmpInt / 255;
                                 if (0<= tmpInt && tmpInt <= 255) {
                                         lp.screenBrightness = tmpInt;
                                 }
                                 
                                 
                                 getWindow().setAttributes(lp);
                         }                }
                @Override
                 public void onStartTrackingTouch(SeekBar seekBar) {
                         // TODO Auto-generated method stub
                         // put awesomeness here
                 }                @Override
                 public void onStopTrackingTouch(SeekBar seekBar) {
                         // TODO Auto-generated method stub
                         // and here too
                 }
         };

这是主程序

下面是权限

<xml>

 <?xml version="1.0" encoding="utf-8"?>

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

         android:orientation="vertical" android:layout_width="fill_parent"

         android:layout_height="fill_parent" android:background="@color/white">

         <TextView android:id="@+id/MyTextView"

                 android:layout_width="fill_parent" android:layout_height="wrap_content"

                 android:text="亮度是:" />

         

                 <SeekBar

                 android:layout_gravity="center_horizontal"

                 android:id="@+id/MySeekBar"

                 android:paddingLeft="5.0dip"

                 android:paddingRight="5.0dip"

                 android:layout_width="fill_parent"

                 android:layout_height="150dip"

                 android:layout_marginTop="10.0dip"

                 android:layout_marginBottom="10.0dip"

                 android:max="255"

                 >

         </SeekBar>

 </LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"

         package="com.jimmy" android:versionCode="1" android:versionName="1.0">

         <application android:icon="@drawable/icon" android:label="@string/app_name">

                 <activity android:name=".MyActivity" android:label="@string/app_name">

                         <intent-filter>

                                 <action android:name="android.intent.action.MAIN" />

                                 <category android:name="android.intent.category.LAUNCHER" />

                         </intent-filter>

                 </activity>


         </application>

         <uses-sdk android:minSdkVersion="5" />

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

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

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

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

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

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



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

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



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


 </manifest>