自动背光调节进度条源码分析_android:finishonclosesystemdialogs="true

1. 背光调节进度条源码分析

frameworks\base\packages\SystemUI\AndroidManifest.xml

<activity    android:name=".settings.BrightnessDialog"    android:label="@string/quick_settings_brightness_dialog_title"    android:theme="@android:style/Theme.DeviceDefault.Dialog"    android:finishOnCloseSystemDialogs="true"    android:launchMode="singleInstance"    android:excludeFromRecents="true"    android:exported="true">

    <intent-filter>

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

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

    </intent-filter>

</activity>

 

frameworks\base\packages\SystemUI\src\com\android\systemui\settings\BrightnessDialog.java

/** A dialog that provides controls for adjusting the screen brightness. */public class BrightnessDialog extends Activity {

 

    private BrightnessController mBrightnessController;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

 

        final ImageView icon = (ImageView) findViewById(R.id.brightness_icon_on);

        final ToggleSlider slider = (ToggleSlider) findViewById(R.id.brightness_slider);

        mBrightnessController = new BrightnessController(this, icon, slider);

    }

 

    @Override

    protected void onStart() {

        super.onStart();

        mBrightnessController.registerCallbacks();

        MetricsLogger.visible(this, MetricsEvent.BRIGHTNESS_DIALOG);

    }

 

    @Override

    protected void onStop() {

        super.onStop();

        MetricsLogger.hidden(this, MetricsEvent.BRIGHTNESS_DIALOG);

        mBrightnessController.unregisterCallbacks();

    }

}

 

BrightnessController 实现了ToggleSlider监听的类，其内部对象类是赋值传入的slider，从而与ToggleSlider 关联起来

mBrightnessController.registerCallbacks(); 将BrightnessController 设置为slider 的监听器，同时设置对数据库的监BrightnessController

 

frameworks\base\packages\SystemUI\src\com\android\systemui\settings\BrightnessController.java

public class BrightnessController implements ToggleSlider.Listener {

public interface BrightnessStateChangeCallback {

    public void onBrightnessLevelChanged();

  }

/** ContentObserver to watch brightness **/private class BrightnessObserver extends ContentObserver {

    private final Uri BRIGHTNESS_MODE_URI =

            Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS_MODE);

    private final Uri BRIGHTNESS_URI =

            Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS);

  }

public void registerCallbacks() {

    if (mListening) {

        return;

    }

 

    mBrightnessObserver.startObserving();

    mUserTracker.startTracking();

 

    // Update the slider and mode before attaching the listener so we don't    // receive the onChanged notifications for the initial values.    updateMode();

    updateSlider();

 

    mControl.setOnChangedListener(this);

    mListening = true;

}

}

当注册数据库监听器与ToggleSlider的监听器后，如果数据库改变，onChange 就会更新ToggleSlider ，如果ToggleSlider  改变了，这回调用其onChange函数，这个时候会更新数据库项，反过来由于数据库项变了，就会更新ToggleSlider  到对应的进度位置。

 

frameworks\base\packages\SystemUI\src\com\android\systemui\settings\ToggleSlider.java

mToggle = (CompoundButton) findViewById(R.id.toggle);mToggle.setOnCheckedChangeListener(mCheckListener);

mSlider = (ToggleSeekBar) findViewById(R.id.slider);mSlider.setOnSeekBarChangeListener(mSeekListener);

 

 

private final OnCheckedChangeListener mCheckListener = new OnCheckedChangeListener() {

    @Override

    public void onCheckedChanged(CompoundButton toggle, boolean checked) {

        mSlider.setEnabled(!checked);

 

        if (mListener != null) {

            mListener.onChanged(

                    ToggleSlider.this, mTracking, checked, mSlider.getProgress(), false);

        }

 

        if (mMirror != null) {

            mMirror.mToggle.setChecked(checked);

        }

    }

};

private final OnSeekBarChangeListener mSeekListener = new OnSeekBarChangeListener() {

    @Override

    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

        if (mListener != null) {

            mListener.onChanged(

                    ToggleSlider.this, mTracking, mToggle.isChecked(), progress, false);

        }

    }

ToggleSlider 是由多个控件组成的，这里一个是check控件、一个是进度条控件，并分别绑定对应的监听器。

 

private ToggleSlider mMirror;private BrightnessMirrorController mMirrorController;

ToggleSlider  这两个成员用于下拉设置中设置与隐藏亮度进度条。

 

public void setMirror(ToggleSlider toggleSlider) {

    mMirror = toggleSlider;

    if (mMirror != null) {

        mMirror.setChecked(mToggle.isChecked());

        mMirror.setMax(mSlider.getMax());

        mMirror.setValue(mSlider.getProgress());

    }

}

public void setMirrorController(BrightnessMirrorController c) {

    mMirrorController = c;

}

 

这里将 mToggle、mSlider 值设置到 mMirror

 

frameworks\base\packages\SystemUI\src\com\android\systemui\qs\QSPanel.java

public void setBrightnessMirror(BrightnessMirrorController c) {

    mBrightnessMirrorController = c;

    ToggleSlider brightnessSlider = (ToggleSlider) findViewById(R.id.brightness_slider);

    ToggleSlider mirror = (ToggleSlider) c.getMirror().findViewById(R.id.brightness_slider);

    brightnessSlider.setMirror(mirror);

    brightnessSlider.setMirrorController(c);

}

frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\PhoneStatusBar.java

mQSPanel.setBrightnessMirror(mBrightnessMirrorController);

这里 mBrightnessMirrorController控制 ToggleSlider mirror其在下拉菜单中的显示与隐藏，而其值由 mToggle、mSlider 的值设置。

 

frameworks\base\packages\SystemUI\src\com\android\systemui\settings\BrightnessController.java

public void onChanged(ToggleSlider view, boolean tracking, boolean automatic, int value,

        boolean stopTracking) {

    updateIcon(mAutomatic);

    if (mExternalChange) return;

 

    if (!mAutomatic) {

        setBrightness(val);

        if (!tracking) {

            AsyncTask.execute(new Runnable() {

                    public void run() {

                        Settings.System.putIntForUser(mContext.getContentResolver(),

                                Settings.System.SCREEN_BRIGHTNESS, val,

                                UserHandle.USER_CURRENT);

                    }

                });

        }

    } else {

        setBrightnessAdj(adj);

        。。。

        }

    }

 

    for (BrightnessStateChangeCallback cb : mChangeCallbacks) {

        cb.onBrightnessLevelChanged();

    }

}

mAutomaticAvailable = context.getResources().getBoolean(

        com.android.internal.R.bool.config_automatic_brightness_available);

自动亮度是否支持，设置Settings.System.SCREEN_BRIGHTNESS_MODE

public static final String SCREEN_BRIGHTNESS_MODE = "screen_brightness_mode";

支持则设置为Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC ，否则设置为 Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL

 

这里监听进度条改变，并记录到数据库中，并调用PMS设置亮度

 

 

private class BrightnessObserver extends ContentObserver {

 

    private final Uri BRIGHTNESS_MODE_URI =

            Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS_MODE);

    private final Uri BRIGHTNESS_URI =

            Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS)

 

BrightnessObserver(Handler handler) {

        super(handler);

    }

 

    @Override    public void onChange(boolean selfChange) {

        onChange(selfChange, null);

    }

 

    @Override    public void onChange(boolean selfChange, Uri uri) {

        if (selfChange) return;

        try {

            mExternalChange = true;

            if (BRIGHTNESS_MODE_URI.equals(uri)) {

                updateMode();

                updateSlider();

}

 

同时systemUI 中BrightnessController会注册监听器监听数据库改变从而改变进度条的位置