我的Android进阶之旅------>自己写个Activity来调节Android系统背光亮度Brightness
2023-09-27 14:29:23 时间
今天终于算初步写好了一个调节系统背光亮度Brightness的代码，本来不看Android源代码以为可以直接调用某个Action来启动系统的那个调节Brightness的对话框，但是看了代码后发现系统调节Brightness的自定义组件BrightnessPreference继承了SeekBarDialogPreference，但是最终父类还是Preference，因此不能够单独启动，必须得将这个自定义的BrightnessPreference用某个Activity才能加载过来，毕竟最终还是一个组件。
修改后BrightnessPreference.showDialog(Bundle state)，即打开对话框的时候重新去读取数据库里面的Brightness的值和复选框是否被选中的值。
==================================================================================== 作者：欧阳鹏 欢迎转载，与人分享是进步的源泉！ 转载请保留原文地址：http://blog.csdn.net/ouyang_peng ===================================================================================
Android | 音视频方向进阶路线及资源合集 但是系统相机和系统控件VideoView的局限性都是可定制型太差,系统相机的图像分辨率,视频码率以及VideoView的进度条等.
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今天终于算初步写好了一个调节系统背光亮度Brightness的代码，本来不看Android源代码以为可以直接调用某个Action来启动系统的那个调节Brightness的对话框，但是看了代码后发现系统调节Brightness的自定义组件BrightnessPreference继承了SeekBarDialogPreference，但是最终父类还是Preference，因此不能够单独启动，必须得将这个自定义的BrightnessPreference用某个Activity才能加载过来，毕竟最终还是一个组件。因此，将系统的BrightnessPreference改写成Activity的形式，然后将Activity的主题设置为对话框的主题即可。
下图是系统自带的对话框，我的Activity就是仿造这个界面做的。
下面是我改写完后的代码，可以和系统设置的背光设置进行同步，即数据同步，无论是使用自己的Activity还是系统自带的调节背光的亮度，都是一样的效果。代码在Eclipse中运行可能会报错，但是别怕，使用Android编译能通过，然后push到Android设备中去运行没有错误。
代码如下：BrightnessDialogActivity.java
import android.app.Activity;
import android.content.ContentResolver;
import android.database.ContentObserver;
import android.os.Bundle;
import android.os.Handler;
import android.os.IPowerManager;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.SeekBar;
import com.android.settings.R;
import com.canplay.systemui.QuickSettings;
import com.canplay.util.DLog;
* @author ouyangpeng
public class BrightnessDialogActivity extends Activity implements
SeekBar.OnSeekBarChangeListener, OnClickListener {
private static String TAG="@@@@@@@@@@@@Brightness----
private SeekBar mSeekBar;
private CheckBox mCheckBox;
private Button btnCancel;
private Button btnSure;
private int mOldBrightness;
private int mOldAutomatic;
private boolean mAutomaticAvailable;
private boolean mAutomaticMode;
private int mCurBrightness = -1;
private boolean mRestoredOldState;
// Backlight range is from 0 - 255. Need to make sure that user
// doesnt set the backlight to 0 and get stuck
private int mScreenBrightnessDim = android.os.PowerManager.BRIGHTNESS_DIM + 10;
private static final int MAXIMUM_BACKLIGHT = android.os.PowerManager.BRIGHTNESS_ON;
private static final int SEEK_BAR_RANGE = 10000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.brightness_dialog_activity);
getContentResolver().registerContentObserver(
Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS),
true, mBrightnessObserver);
getContentResolver()
.registerContentObserver(
Settings.System
.getUriFor(Settings.System.SCREEN_BRIGHTNESS_MODE),
true, mBrightnessModeObserver);
mRestoredOldState = false;
mAutomaticAvailable = true;
* mAutomaticAvailable = getResources() .getBoolean(
* com.android.internal.R.bool.config_automatic_brightness_available);
// mAutomaticAvailable=getBrightnessMode(0)==Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
mSeekBar = (SeekBar) findViewById(R.id.brightnessSeekbar);
mSeekBar.setMax(SEEK_BAR_RANGE);
mOldBrightness = getBrightness();
mSeekBar.setProgress(mOldBrightness);
mCheckBox = (CheckBox) findViewById(R.id.brightness_automatic_mode);
// 重新读取配置信息
// onBrightnessChanged();
// onBrightnessModeChanged();
if (mAutomaticAvailable) {
mCheckBox
.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
setMode(isChecked ? Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC
: Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
mSeekBar.setProgress(getBrightness());
mSeekBar.setEnabled(!mAutomaticMode);
setBrightness(mSeekBar.getProgress(), false);
mOldAutomatic = getBrightnessMode(0);
mAutomaticMode = mOldAutomatic == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
mCheckBox.setChecked(mAutomaticMode);
mSeekBar.setEnabled(!mAutomaticMode);
} else {
mSeekBar.setEnabled(true);
mSeekBar.setOnSeekBarChangeListener(this);
btnSure = (Button) findViewById(R.id.btnSure);
btnSure.setOnClickListener(this);
btnCancel = (Button) findViewById(R.id.btnCancel);
btnCancel.setOnClickListener(this);
private ContentObserver mBrightnessObserver = new ContentObserver(
new Handler()) {
@Override
public void onChange(boolean selfChange) {
mCurBrightness = -1;
onBrightnessChanged();
private ContentObserver mBrightnessModeObserver = new ContentObserver(
new Handler()) {
@Override
public void onChange(boolean selfChange) {
onBrightnessModeChanged();
private void onBrightnessChanged() {
mSeekBar.setProgress(getBrightness());
private void onBrightnessModeChanged() {
boolean checked = getBrightnessMode(0) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
mCheckBox.setChecked(checked);
mSeekBar.setProgress(getBrightness());
mSeekBar.setEnabled(!checked);
private int getBrightnessMode(int defaultValue) {
int brightnessMode = defaultValue;
try {
brightnessMode = Settings.System.getInt(getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE);
} catch (SettingNotFoundException snfe) {
return brightnessMode;
private int getBrightness() {
int mode = getBrightnessMode(0);
float brightness = 0;
if (mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {
brightness = Settings.System.getFloat(getContentResolver(),
Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ, 0);
brightness = (brightness + 1) / 2;
} else {
if (mCurBrightness 0) {
brightness = Settings.System.getInt(getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS, 100);
} else {
brightness = mCurBrightness;
brightness = (brightness - mScreenBrightnessDim)
/ (MAXIMUM_BACKLIGHT - mScreenBrightnessDim);
return (int) (brightness * SEEK_BAR_RANGE);
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
setBrightness(progress, false);
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
private void setMode(int mode) {
mAutomaticMode = mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
Settings.System.putInt(getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE, mode);
private void setBrightness(int brightness, boolean write) {
if (mAutomaticMode) {
float valf = (((float) brightness * 2) / SEEK_BAR_RANGE) - 1.0f;
try {
IPowerManager power = IPowerManager.Stub
.asInterface(ServiceManager.getService("power"));
if (power != null) {
power.setAutoBrightnessAdjustment(valf);
if (write) {
final ContentResolver resolver = getContentResolver();
Settings.System.putFloat(resolver,
Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ,
valf);
} catch (RemoteException doe) {
} else {
int range = (MAXIMUM_BACKLIGHT - mScreenBrightnessDim);
brightness = (brightness * range) / SEEK_BAR_RANGE
+ mScreenBrightnessDim;
try {
IPowerManager power = IPowerManager.Stub
.asInterface(ServiceManager.getService("power"));
if (power != null) {
power.setBacklightBrightness(brightness);
if (write) {
mCurBrightness = -1;
final ContentResolver resolver = getContentResolver();
Settings.System.putInt(resolver,
Settings.System.SCREEN_BRIGHTNESS, brightness);
} else {
mCurBrightness = brightness;
} catch (RemoteException doe) {
private void restoreOldState() {
if (mRestoredOldState)
return;
if (mAutomaticAvailable) {
setMode(mOldAutomatic);
setBrightness(mOldBrightness, false);
mRestoredOldState = true;
mCurBrightness = -1;
@Override
public void onClick(View v) {
final ContentResolver resolver = getContentResolver();
if (v == findViewById(R.id.btnSure)) {
setBrightness(mSeekBar.getProgress(), true);
this.finish();
} else if (v == findViewById(R.id.btnCancel)) {
restoreOldState();
this.finish();
resolver.unregisterContentObserver(mBrightnessObserver);
resolver.unregisterContentObserver(mBrightnessModeObserver);
相应的布局文件如下：brightness_dialog_activity.xml
?xml version="1.0" encoding="utf-8"? ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal" android:orientation="vertical" android:paddingBottom="20dip" ImageView android:id="@android:id/icon" android:layout_width="wrap_content" android:layout_height="wrap_content" android:contentDescription="@null" android:paddingTop="20dip" android:visibility="gone" / CheckBox android:id="@+id/brightness_automatic_mode" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginLeft="20dip" android:layout_marginRight="20dip" android:layout_marginTop="6dip" android:text="@string/automatic_brightness" android:textAppearance="?android:attr/textAppearanceSmall" / SeekBar android:id="@+id/brightness_seekbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="20dip" / LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" Button android:id="@+id/btn_cancel" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" android:text="@string/cancel" android:layout_gravity="center" / Button android:id="@+id/btn_sure" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" android:text="@string/sure" android:layout_gravity="center" / /LinearLayout /LinearLayout /ScrollView
注册Activity的时候使用下面的主题
android:theme="@android:style/Theme.Holo.Dialog"
但是有个bug，即调用系统的应用调节背光的时候，Seekbar的值和复选框是否被勾中在我的自定义Activity中的Seekbar的值和复选框是否被勾中同步，但是反过来就不行了。
再次读取系统的BrightnessPreference发现是因为没有去进行更新操作。因此得修改Android的源代码，重新编译后才能达到两边数据随便那边修改后，两边的数据都同步。
修改如下所示，修改前BrightnessPreference.showDialog(Bundle state)
@Override
protected void showDialog(Bundle state) {
super.showDialog(state);
getContext().getContentResolver().registerContentObserver(
Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS), true,
mBrightnessObserver);
getContext().getContentResolver().registerContentObserver(
Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS_MODE), true,
mBrightnessModeObserver);
mRestoredOldState = false;
}
修改后BrightnessPreference.showDialog(Bundle state)，即打开对话框的时候重新去读取数据库里面的Brightness的值和复选框是否被选中的值。
@Override
protected void showDialog(Bundle state) {
super.showDialog(state);
getContext().getContentResolver().registerContentObserver(
Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS), true,
mBrightnessObserver);
getContext().getContentResolver().registerContentObserver(
Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS_MODE), true,
mBrightnessModeObserver);
onBrightnessChanged();
onBrightnessModeChanged();
mRestoredOldState = false;
}
==================================================================================== 作者：欧阳鹏 欢迎转载，与人分享是进步的源泉！ 转载请保留原文地址：http://blog.csdn.net/ouyang_peng ===================================================================================
最后附上系统调节Brightness的代码
/*
* Copyright (C) 2008 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
package com.android.settings;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.os.Bundle;
import android.os.Handler;
import android.os.IPowerManager;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.preference.SeekBarDialogPreference;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.util.AttributeSet;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.SeekBar;
public class BrightnessPreference extends SeekBarDialogPreference implements
SeekBar.OnSeekBarChangeListener, CheckBox.OnCheckedChangeListener {
private SeekBar mSeekBar;
private CheckBox mCheckBox;
private int mOldBrightness;
private int mOldAutomatic;
private boolean mAutomaticAvailable;
private boolean mAutomaticMode;
private int mCurBrightness = -1;
private boolean mRestoredOldState;
// Backlight range is from 0 - 255. Need to make sure that user
// doesnt set the backlight to 0 and get stuck
private int mScreenBrightnessDim =
getContext().getResources().getInteger(com.android.internal.R.integer.config_screenBrightnessDim);
private static final int MAXIMUM_BACKLIGHT = android.os.PowerManager.BRIGHTNESS_ON;
private static final int SEEK_BAR_RANGE = 10000;
private ContentObserver mBrightnessObserver = new ContentObserver(new Handler()) {
@Override
public void onChange(boolean selfChange) {
mCurBrightness = -1;
onBrightnessChanged();
private ContentObserver mBrightnessModeObserver = new ContentObserver(new Handler()) {
@Override
public void onChange(boolean selfChange) {
onBrightnessModeChanged();
public BrightnessPreference(Context context, AttributeSet attrs) {
super(context, attrs);
mAutomaticAvailable = context.getResources().getBoolean(
com.android.internal.R.bool.config_automatic_brightness_available);
setDialogLayoutResource(R.layout.preference_dialog_brightness);
setDialogIcon(R.drawable.ic_settings_display);
@Override
protected void showDialog(Bundle state) {
super.showDialog(state);
getContext().getContentResolver().registerContentObserver(
Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS), true,
mBrightnessObserver);
getContext().getContentResolver().registerContentObserver(
Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS_MODE), true,
mBrightnessModeObserver);
onBrightnessChanged();
onBrightnessModeChanged();
mRestoredOldState = false;
@Override
protected void onBindDialogView(View view) {
super.onBindDialogView(view);
mSeekBar = getSeekBar(view);
mSeekBar.setMax(SEEK_BAR_RANGE);
mOldBrightness = getBrightness();
mSeekBar.setProgress(mOldBrightness);
mCheckBox = (CheckBox)view.findViewById(R.id.automatic_mode);
if (mAutomaticAvailable) {
mCheckBox.setOnCheckedChangeListener(this);
mOldAutomatic = getBrightnessMode(0);
mAutomaticMode = mOldAutomatic == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
mCheckBox.setChecked(mAutomaticMode);
mSeekBar.setEnabled(!mAutomaticMode);
} else {
mSeekBar.setEnabled(true);
mSeekBar.setOnSeekBarChangeListener(this);
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromTouch) {
setBrightness(progress, false);
public void onStartTrackingTouch(SeekBar seekBar) {
// NA
public void onStopTrackingTouch(SeekBar seekBar) {
// NA
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
setMode(isChecked ? Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC
: Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
mSeekBar.setProgress(getBrightness());
mSeekBar.setEnabled(!mAutomaticMode);
setBrightness(mSeekBar.getProgress(), false);
private int getBrightness() {
int mode = getBrightnessMode(0);
float brightness = 0;
if (false mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {
brightness = Settings.System.getFloat(getContext().getContentResolver(),
Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ, 0);
brightness = (brightness+1)/2;
} else {
if (mCurBrightness 0) {
brightness = Settings.System.getInt(getContext().getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS, 100);
} else {
brightness = mCurBrightness;
brightness = (brightness - mScreenBrightnessDim)
/ (MAXIMUM_BACKLIGHT - mScreenBrightnessDim);
return (int)(brightness*SEEK_BAR_RANGE);
private int getBrightnessMode(int defaultValue) {
int brightnessMode = defaultValue;
try {
brightnessMode = Settings.System.getInt(getContext().getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE);
} catch (SettingNotFoundException snfe) {
return brightnessMode;
private void onBrightnessChanged() {
mSeekBar.setProgress(getBrightness());
private void onBrightnessModeChanged() {
boolean checked = getBrightnessMode(0)
== Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
mCheckBox.setChecked(checked);
mSeekBar.setProgress(getBrightness());
mSeekBar.setEnabled(!checked);
@Override
protected void onDialogClosed(boolean positiveResult) {
super.onDialogClosed(positiveResult);
final ContentResolver resolver = getContext().getContentResolver();
if (positiveResult) {
setBrightness(mSeekBar.getProgress(), true);
} else {
restoreOldState();
resolver.unregisterContentObserver(mBrightnessObserver);
resolver.unregisterContentObserver(mBrightnessModeObserver);
private void restoreOldState() {
if (mRestoredOldState) return;
if (mAutomaticAvailable) {
setMode(mOldAutomatic);
setBrightness(mOldBrightness, false);
mRestoredOldState = true;
mCurBrightness = -1;
private void setBrightness(int brightness, boolean write) {
if (mAutomaticMode) {
if (false) {
float valf = (((float)brightness*2)/SEEK_BAR_RANGE) - 1.0f;
try {
IPowerManager power = IPowerManager.Stub.asInterface(
ServiceManager.getService("power"));
if (power != null) {
power.setAutoBrightnessAdjustment(valf);
if (write) {
final ContentResolver resolver = getContext().getContentResolver();
Settings.System.putFloat(resolver,
Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ, valf);
} catch (RemoteException doe) {
} else {
int range = (MAXIMUM_BACKLIGHT - mScreenBrightnessDim);
brightness = (brightness*range)/SEEK_BAR_RANGE + mScreenBrightnessDim;
try {
IPowerManager power = IPowerManager.Stub.asInterface(
ServiceManager.getService("power"));
if (power != null) {
power.setBacklightBrightness(brightness);
if (write) {
mCurBrightness = -1;
final ContentResolver resolver = getContext().getContentResolver();
Settings.System.putInt(resolver,
Settings.System.SCREEN_BRIGHTNESS, brightness);
} else {
mCurBrightness = brightness;
} catch (RemoteException doe) {
private void setMode(int mode) {
mAutomaticMode = mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
Settings.System.putInt(getContext().getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE, mode);
@Override
protected Parcelable onSaveInstanceState() {
final Parcelable superState = super.onSaveInstanceState();
if (getDialog() == null || !getDialog().isShowing()) return superState;
// Save the dialog state
final SavedState myState = new SavedState(superState);
myState.automatic = mCheckBox.isChecked();
myState.progress = mSeekBar.getProgress();
myState.oldAutomatic = mOldAutomatic == 1;
myState.oldProgress = mOldBrightness;
myState.curBrightness = mCurBrightness;
// Restore the old state when the activity or dialog is being paused
restoreOldState();
return myState;
@Override
protected void onRestoreInstanceState(Parcelable state) {
if (state == null || !state.getClass().equals(SavedState.class)) {
// Didnt save state for us in onSaveInstanceState
super.onRestoreInstanceState(state);
return;
SavedState myState = (SavedState) state;
super.onRestoreInstanceState(myState.getSuperState());
mOldBrightness = myState.oldProgress;
mOldAutomatic = myState.oldAutomatic ? 1 : 0;
setMode(myState.automatic ? 1 : 0);
setBrightness(myState.progress, false);
mCurBrightness = myState.curBrightness;
private static class SavedState extends BaseSavedState {
boolean automatic;
boolean oldAutomatic;
int progress;
int oldProgress;
int curBrightness;
public SavedState(Parcel source) {
super(source);
automatic = source.readInt() == 1;
progress = source.readInt();
oldAutomatic = source.readInt() == 1;
oldProgress = source.readInt();
curBrightness = source.readInt();
@Override
public void writeToParcel(Parcel dest, int flags) {
super.writeToParcel(dest, flags);
dest.writeInt(automatic ? 1 : 0);
dest.writeInt(progress);
dest.writeInt(oldAutomatic ? 1 : 0);
dest.writeInt(oldProgress);
dest.writeInt(curBrightness);
public SavedState(Parcelable superState) {
super(superState);
public static final Parcelable.Creator SavedState CREATOR =
new Parcelable.Creator SavedState () {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
public SavedState[] newArray(int size) {
return new SavedState[size];
Android | 音视频方向进阶路线及资源合集 但是系统相机和系统控件VideoView的局限性都是可定制型太差,系统相机的图像分辨率,视频码率以及VideoView的进度条等.
字节卷动 You will never know how excellent you are unless you impel yourself once.
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