devbox
花生_TL007
这个屌丝很懒，什么也没留下！
关注作者
热门标签
热门文章
当前位置:   article > 正文

android_brightness_resolving_android brightnesssliderview

作者：花生_TL007 | 2024-03-26 05:10:14

赞

踩

android brightnesssliderview

浅析Brightness的创建和执行流程：

步凑一 系统中packages\apps\Settings\res\xml\display_settings.xml中有添加preference组件：

  1.         <com.android.settings.BrightnessPreference
  2.                 android:title="@string/brightness"
  3.                 android:persistent="false"/>
//在自定义BrightnessPreference.java中只发送了一条广播： 

  1. public class BrightnessPreference extends Preference {
  2.  
  3.  
  4.     public BrightnessPreference(Context context, AttributeSet attrs) {
  5.         super(context, attrs);
  6.     }
  7.  
  8.  
  9.     @Override
  10.     protected void onClick() {
  11.       //发送了一个显示亮度调节对话框的广播
  12.     Intent intent = new Intent(Intent.ACTION_SHOW_BRIGHTNESS_DIALOG); 
  13.     getContext().sendBroadcastAsUser(intent, UserHandle.CURRENT_OR_SELF); }}

 

步凑二 接收广播并且显示BrightnessDialog菜单的消息是在framework中接收处理的：
 

 

  1. public class SettingsUI extends SystemUI {
  2.     private static final String TAG = "SettingsUI";
  3.     private static final boolean DEBUG = false;
  4.  
  5.     private final Handler mHandler = new Handler();
  6.     private BrightnessDialog mBrightnessDialog;
  7.  
  8.     private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
  9.         @Override
  10.         public void onReceive(Context context, Intent intent) {
  11.             String action = intent.getAction();
  12.             if (action.equals(Intent.ACTION_SHOW_BRIGHTNESS_DIALOG)) {
  13.                 if (DEBUG) Log.d(TAG, "showing brightness dialog");
  14.                 if (mBrightnessDialog == null) {
  15.                    //创建BrightnessDialog实例
  16.                     mBrightnessDialog = new BrightnessDialog(mContext);
  17.                     mBrightnessDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
  18.                         @Override
  19.                         public void onDismiss(DialogInterface dialog) {
  20.                             mBrightnessDialog = null;
  21.                         }
  22.                     });
  23.                 }
  24.  
  25.                 if (!mBrightnessDialog.isShowing()) {
  26.                 //显示brightnessDialog
  27.                     mBrightnessDialog.show();
  28.                 }
  29.  
  30.             } else {
  31.                 Log.w(TAG, "unknown intent: " + intent);
  32.             }
  33.         }
  34.     };
  35.  
  36.     public void start() {
  37.         //监听ACTION_SHOW_BRIGHTNESS_DIALOG的广播
  38.         IntentFilter filter = new IntentFilter();
  39.         filter.addAction(Intent.ACTION_SHOW_BRIGHTNESS_DIALOG);
  40.         mContext.registerReceiverAsUser(mIntentReceiver, UserHandle.ALL, filter, null, mHandler);
  41.     }
 

 

 

步凑三 创建seekbar布局定义的结构层次是：
 

       1.BrightnessDialog.java
        2.BrightnessDialog.java中创建了quick_settings_brightness_dialog
        3.quick_settings_brightness_dialog中自定义了控件com.android.systemui.settings.ToggleSlider
        4.ToggleSlider.java中真正创建了seekbar控件。
        如下是：BrightnessDialog.java
 

  1.     @Override
  2.     public void onCreate(Bundle savedInstanceState) {
  3.         super.onCreate(savedInstanceState);
  4.         Window window = getWindow();
  5.         window.setType(WindowManager.LayoutParams.TYPE_VOLUME_OVERLAY);
  6.         window.getAttributes().privateFlags |=
  7.                 WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
  8.         window.clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
  9.         window.requestFeature(Window.FEATURE_NO_TITLE);
  10.  
  11.         /*SPRD bug 636829:Don't auto dismiss brightness dialog*/
  12.         window.setGravity(Gravity.CENTER_VERTICAL);
  13.         setContentView(R.layout.quick_settings_brightness_dialog);
  14.         setCanceledOnTouchOutside(true);
  15.     }
 

 

       如下是quick_settings_brightness_dialog布局文件：
 
 

 

  1.     <TextView
  2.         android:id="@+id/tab_switch_container_display"
  3.         android:layout_centerVertical="true"
  4.         android:layout_gravity="center_horizontal"
  5.         android:layout_width="wrap_content"
  6.         android:layout_height="wrap_content"
  7.         android:textColor="#ffffffff"
  8.         android:textSize="18px"
  9.         android:text="@string/label_screen_brightness"/>
  10.  
  11.     <com.android.systemui.settings.ToggleSlider
  12.         android:id="@+id/brightness_slider"
  13.         android:layout_width="wrap_content"
  14.         android:layout_height="wrap_content"
  15.         android:layout_gravity="center_vertical"
  16.         android:layout_weight="1"
  17.         systemui:text="@string/status_bar_settings_auto_brightness_label" />
 

        如下是：com.android.systemui.settings.ToggleSlider文件  
 

 

  1.     public ToggleSlider(Context context, AttributeSet attrs, int defStyle) {
  2.         super(context, attrs, defStyle);
  3.         View.inflate(context, R.layout.status_bar_toggle_slider, this);
  4.         final Resources res = context.getResources();
  5.         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ToggleSlider,
  6.                 defStyle, 0);
  7.  
  8.         mToggle = (CompoundButton)findViewById(R.id.toggle);
  9.         
  10.         /* SPRD:Modify Bug 333649, remove brightness auto set @{ */
  11.         if (fileIsExists()) {
  12.             mToggle.setOnCheckedChangeListener(this);
  13.             mToggle.setBackgroundDrawable(res.getDrawable(R.drawable.status_bar_toggle_button));
  14.         }
  15.         /* @} */
  16.  
  17.         mSlider = (SeekBar)findViewById(R.id.slider);
  18.         mSlider.setOnSeekBarChangeListener(this);
  19.  
  20.         mLabel = (TextView)findViewById(R.id.label);
  21.         mLabel.setVisibility(GONE);
  22.         /* SPRD:Modify Bug 333649, remove brightness auto set @{ */
  23.         /* SPRD: Bug 583693 PikeL Feature {@ */
  24.         //if (fileIsExists()) {
  25.             //mLabel.setText(a.getString(R.styleable.ToggleSlider_text));
  26.         //}
  27.         /* @} */
  28.  
  29.         a.recycle();
  30.     }
    如下是：真正创建了seekbar控件 

 

 

 

 

  1.     <com.android.systemui.settings.ToggleSeekBar
  2.         android:id="@+id/slider"
  3.         android:layout_width="0dp"
  4.         android:layout_height="wrap_content"
  5.         android:layout_toEndOf="@id/toggle"
  6.         android:layout_centerVertical="true"
  7.         android:layout_alignParentStart="true"
  8.         android:layout_alignParentEnd="true"
  9.         android:paddingStart="20dp"
  10.         android:paddingEnd="20dp"
  11.         android:paddingTop="12dp"
  12.         android:paddingBottom="12dp"
  13.         //设置拖动进度条上的拇指图标
  14.         android:thumb="@drawable/ic_brightness_thumb_customized"
 

 

 

步凑四 对亮度的真正调节效果是使用了BrightnessDialog.java中的BrightnessController：
 

 

  1.     protected void onStart() {
  2.         super.onStart();
  3.         mBrightnessController = new BrightnessController(getContext(),
  4.                 (ImageView) findViewById(R.id.brightness_icon),
  5.                 (ToggleSlider) findViewById(R.id.brightness_slider));
  6.         dismissBrightnessDialog(mBrightnessDialogLongTimeout);
  7.         mBrightnessController.addStateChangedCallback(this);
 

对BrightnessController中的浅析：
 在上面onStart中创建了BrightnessDialog对象时构造函数中做了如下操作：
 
 

 

  1.    public BrightnessController(Context context, ImageView icon, ToggleSlider control) {
  2.         mContext = context;
  3.         mIcon = icon;
  4.         mControl = control;
  5.         /* SPRD: add to optimize oom for bug 295792 @{ */
  6.        //接收SCREEN_BRIGHTNESS_MESSAGE_ID发送过来的消息处理：（保存亮度值的方式二种用到的方法，在下面代码中）
  7.         mHandler = new Handler(){
  8.             @Override
  9.             public void handleMessage(Message msg) {
  10.                 // TODO Auto-generated method stub
  11.                 super.handleMessage(msg);
  12.                 if (msg.what == SCREEN_BRIGHTNESS_MESSAGE_ID) {
  13.                     //保存当前的亮度值至Settings.system系统中
  14.                     Settings.System.putIntForUser(mContext.getContentResolver(),
  15.                             Settings.System.SCREEN_BRIGHTNESS, msg.arg1,
  16.                             UserHandle.USER_CURRENT);
  17.                 }
  18.             }
  19.         };
  20.         /* @} */
  21.         mUserTracker = new CurrentUserTracker(mContext) {
  22.             @Override
  23.             public void onUserSwitched(int newUserId) {
  24.                 updateMode();
  25.                 updateSlider();
  26.             }
  27.         };
  28.        //创建观察者模式监控亮屏的模式和亮度值状态，当发生改变时进行更新
  29.         mBrightnessObserver = new BrightnessObserver(mHandler);
  30.         mBrightnessObserver.startObserving();
  31.  
  32.        //获取PowerManager对象，从而获得亮度的最大值和最小亮度值     
  33.         PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
  34.         mMinimumBacklight = pm.getMinimumScreenBrightnessSetting();
  35.         mMaximumBacklight = pm.getMaximumScreenBrightnessSetting();
  36.  
  37.  
  38.         mAutomaticAvailable = context.getResources().getBoolean(
  39.                 com.android.internal.R.bool.config_automatic_brightness_available);
  40.        //获取IpowerManager对象
  41.         mPower = IPowerManager.Stub.asInterface(ServiceManager.getService("power"));
  42.  
  43.  
  44.         // Update the slider and mode before attaching the listener so we don't receive the
  45.         // onChanged notifications for the initial values.
  46.         updateMode();
  47.         updateSlider();
  48.  
  49.  
  50.         control.setOnChangedListener(this);
  51.     }
 

 

其中ToggleSlider文件中对seekbar控件进行监控事件处理的三个重写的方法：
 

 
 
  1.      //拖动中
  2.     public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
  3.         if (mListener != null) {
  4.             mListener.onChanged(this, mTracking, mToggle.isChecked(), progress);
  5.         }
  6.     }
  7.     //开始拖动
  8.     public void onStartTrackingTouch(SeekBar seekBar) {
  9.         mTracking = true;
  10.         if (mListener != null) {
  11.             mListener.onChanged(this, mTracking, mToggle.isChecked(), mSlider.getProgress());
  12.         }
  13.         mToggle.setChecked(false);
  14.     }
  15.     //停止拖动
  16.     public void onStopTrackingTouch(SeekBar seekBar) {
  17.         mTracking = false;
  18.         if (mListener != null) {
  19.             mListener.onChanged(this, mTracking, mToggle.isChecked(), mSlider.getProgress());
  20.         }
  21.     }
 
 
 
 
 

 

 
 在BrightnessController.java中实际处理了如下信息： 

 

 
 
  1.     public void onChanged(ToggleSlider view, boolean tracking, boolean automatic, int value) {
  2.        //设置亮度的设置模式，mode=0表示为手动，mode=1表示自动调节
  3.         setMode(automatic ? Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC
  4.                 : Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
  5.         updateIcon(automatic);
  6.         if (!automatic) {
  7.             final int val = value + mMinimumBacklight;
  8.             //设置屏幕的亮度
  9.             setBrightness(val);
  10.             // SPRD: fixbug364442 add log for brightness control.
  11.             Log.d(TAG, "onChanged : value =" + value + " , mMinimumBacklight =" +
  12.                     mMinimumBacklight + " , tracking =" + tracking);
  13.             //以下的设置是将屏幕的亮度值保存到settings/system中的两种方式
  14.            //方式一：直接putIntForUser
  15.             if (!tracking) {
  16.                 /* SPRD: add to optimize oom for bug 295792 @{
  17.                  * @origin: we move it to handlemessage beicause there are too many runnables
  18.                  * AsyncTask.execute(new Runnable() {
  19.                  * public void run() {
  20.                  *            Settings.System.putIntForUser(mContext.getContentResolver(),
  21.                  *                    Settings.System.SCREEN_BRIGHTNESS, val,
  22.                  *                    UserHandle.USER_CURRENT);
  23.                  *        }
  24.                  *    });
  25.                  */
  26.            //方式二：通过handle  发送一个SCREEN_BRIGHTNESS_MESSAGE_ID消息给到接收方处理保存亮度。
  27.                 mHandler.removeMessages(SCREEN_BRIGHTNESS_MESSAGE_ID);
  28.                 //发送SCREEN_BRIGHTNESS_MESSAGE_ID消息
  29.                 mHandler.obtainMessage(SCREEN_BRIGHTNESS_MESSAGE_ID, val, -1).sendToTarget();
  30.                 /* @} */
  31.             }
  32.         }
  33.  
  34.         for (BrightnessStateChangeCallback cb : mChangeCallbacks) {
  35.             cb.onBrightnessLevelChanged();
  36.         }
  37.     }
 
 附加：设置屏亮度 

 

  1.     private void setBrightness(int brightness) {
  2.         try {
  3.             mPower.setTemporaryScreenBrightnessSettingOverride(brightness);
  4.         } catch (RemoteException ex) {
  5.         }
  6.     }
 
设置亮屏模式： 

 

  1.     private void setMode(int mode) {
  2.         Settings.System.putIntForUser(mContext.getContentResolver(),
  3.                 Settings.System.SCREEN_BRIGHTNESS_MODE, mode,
  4.                 mUserTracker.getCurrentUserId());
  5.     }
 

 时间关系，只能仓促的这样结束了，条理不怎么清晰，看不懂莫怪，还有可能误导大家，写这个就是希望有人能指正我的错误，仅供参考吧！ 

 

 

 

 


 
 

 

 

 


 
 

                

        
声明：本文内容由网友自发贡献，不代表【wpsshop博客】立场，版权归原作者所有，本站不承担相应法律责任。如您发现有侵权的内容，请联系我们。转载请注明出处：https://www.wpsshop.cn/w/花生_TL007/article/detail/314839
推荐阅读
相关标签
Copyright ©  2003-2013 www.wpsshop.cn  版权所有，并保留所有权利。

  
闽ICP备14008679号