节省电量—手机屏幕亮度调整
手机屏幕亮度调整：有两种方法，第一种是自动调整，第二种是拉动显示
首先，获取系统管理
/***********************************************************************
*
* Copyright: 2011, BAINA Technologies Co. Ltd.
* Classname: SystemManager.java
* Author: yuewang
* Description: TODO
* History:
* 1. Date: 2011-9-21
* Author: yuewang
* Modifycation: create the class.
*
***********************************************************************/
package com.TestBrightness.manager;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.net.Uri;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.text.format.Formatter;
import android.view.WindowManager;
/**
* @author yuewang
*
*/
public class SystemManager {
private Context mContext;
private static SystemManager sInstance;
private SystemManager(final Context context) {
mContext = context;
}
/**
* Advice to invoke init in application.
*
* @param context
* @return
*/
public static SystemManager init(final Context context) {
if (null == sInstance) {
sInstance = new SystemManager(context);
}
return sInstance;
}
/**
*
* @return
*/
public static SystemManager getInstance() {
return sInstance;
}
/**
* 判断是否开启了自动亮度调节
*
* @param aContext
* @return
*/
public boolean isAutoBrightness() {
boolean automicBrightness = false;
try {
final ContentResolver resolver = mContext.getContentResolver();
automicBrightness = Settings.System.getInt(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
} catch (final SettingNotFoundException e) {
e.printStackTrace();
}
return automicBrightness;
}
/**
* 设置屏幕亮度，这会反映到真实屏幕上
*
* @param activity
* @param brightness
*/
public void setBrightness(final Activity activity, final int brightness) {
final WindowManager.LayoutParams lp = activity.getWindow()
.getAttributes();
lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
activity.getWindow().setAttributes(lp);
}
/**
* 保存亮度设置状态
*
* @param resolver
* @param brightness
*/
public void saveBrightness(final int brightness) {
final ContentResolver resolver = mContext.getContentResolver();
final Uri uri = android.provider.Settings.System
.getUriFor("screen_brightness");
android.provider.Settings.System.putInt(resolver, "screen_brightness",
brightness);
// resolver.registerContentObserver(uri, true, myContentObserver);
resolver.notifyChange(uri, null);
}
/**
* 开启亮度自动调节
*
* @param activity
*/
public void startAutoBrightness() {
final ContentResolver resolver = mContext.getContentResolver();
Settings.System.putInt(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
final Uri uri = android.provider.Settings.System
.getUriFor("screen_brightness");
resolver.notifyChange(uri, null);
}
/**
* 停止自动亮度调节
*
* @param activity
*/
public void stopAutoBrightness() {
final ContentResolver resolver = mContext.getContentResolver();
Settings.System.putInt(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
final Uri uri = android.provider.Settings.System
.getUriFor("screen_brightness");
resolver.notifyChange(uri, null);
}
/**
* 获取屏幕的亮度
*
* @param activity
* @return
*/
public int getScreenBrightness() {
int nowBrightnessValue = 0;
try {
final ContentResolver resolver = mContext.getContentResolver();
nowBrightnessValue = android.provider.Settings.System.getInt(
resolver, Settings.System.SCREEN_BRIGHTNESS);
} catch (final Exception e) {
e.printStackTrace();
}
return nowBrightnessValue;
}
/**
* 保存亮度的显示模式
*
* @return
*/
public void setBrightnessMode(int mode) {
Settings.System.putInt(mContext.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE, mode);
}
/**
* 获取亮度的显示模式
*
* @return
*/
public int getBrightnessMode() {
try {
return Settings.System.getInt(mContext.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE);
} catch (SettingNotFoundException e) {
return Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
}
}
public String formatMemorySize(final long memory) {
return Formatter.formatFileSize(mContext, memory);
}
}
然后通过Activity显示出来
package com.TestBrightness;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.Toast;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import com.TestBrightness.manager.SystemManager;
public class TestBrightness extends Activity implements OnClickListener {
/** Called when the activity is first created. */
private Button Start;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
SystemManager.init(this);
showBrightnessSettingDialog();
GetPhone();
}
private void GetPhone(){
// 创建电话管理
TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
// 获取手机号码
String phoneId = tm.getLine1Number();
Toast.makeText(this, phoneId+"", Toast.LENGTH_SHORT).show();
System.out.println("=============" + phoneId);
}
@Override
public void onClick(View v) {
showBrightnessSettingDialog();
}
private int mOldBrightness;
private int mCurrentBrightness = 0;
private int mOldAutomatic;
private boolean mAutomaticAvailable;
/**
* Brightness value for dim backlight
*/
private static final int BRIGHTNESS_DIM = 20;
/**
* Brightness value for fully on
*/
private static final int BRIGHTNESS_ON = 255;
// Backlight range is from 0 - 255. Need to make sure that user
// doesn't set the backlight to 0 and get stuck
private static final int MINIMUM_BACKLIGHT = BRIGHTNESS_DIM + 10;
private static final int MAXIMUM_BACKLIGHT = BRIGHTNESS_ON;
private void showBrightnessSettingDialog() {
final SystemManager systemManager = SystemManager.getInstance();
final Builder builder = new AlertDialog.Builder(this);
final View view = getLayoutInflater().inflate(R.layout.brightness_view,
null);
// set brightness seekbar
final SeekBar brightnessBar = (SeekBar) view
.findViewById(R.id.brightness_bar);
brightnessBar.setMax(MAXIMUM_BACKLIGHT - MINIMUM_BACKLIGHT);
int brightness = systemManager.getScreenBrightness();
int process = brightness - MINIMUM_BACKLIGHT;
if (process < 0) {
process = 0;
mOldBrightness = MINIMUM_BACKLIGHT;
mCurrentBrightness = MINIMUM_BACKLIGHT;
} else {
mOldBrightness = brightness;
mCurrentBrightness = brightness;
}
brightnessBar.setProgress(process);
// set automatic available checkbox
final CheckBox autoBrightness = (CheckBox) view
.findViewById(R.id.auto_brightness);
mOldAutomatic = systemManager.getBrightnessMode();
mAutomaticAvailable = systemManager.isAutoBrightness();
autoBrightness.setChecked(mAutomaticAvailable);
if (mAutomaticAvailable) {
brightnessBar.setVisibility(View.GONE);
} else {
brightnessBar.setVisibility(View.VISIBLE);
}
autoBrightness
.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(
final CompoundButton buttonView,
final boolean isChecked) {
mAutomaticAvailable = isChecked;
if (isChecked) {
brightnessBar.setVisibility(View.GONE);
systemManager.startAutoBrightness();
// systemManager.setBrightness(MainActivity.this,
// systemManager.getScreenBrightness());
int process = systemManager.getScreenBrightness()
- MINIMUM_BACKLIGHT;
if (process < 0) {
process = 0;
}// end if
brightnessBar.setProgress(process);
} else {
brightnessBar.setVisibility(View.VISIBLE);
systemManager.stopAutoBrightness();
// systemManager.setBrightness(MainActivity.this,
// systemManager.getScreenBrightness());
int process = systemManager.getScreenBrightness()
- MINIMUM_BACKLIGHT;
if (process < 0) {
process = 0;
}// end if
brightnessBar.setProgress(process);
}
}
});
brightnessBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(final SeekBar seekBar) {
}
@Override
public void onStartTrackingTouch(final SeekBar seekBar) {
}
@Override
public void onProgressChanged(final SeekBar seekBar,
final int progress, final boolean fromUser) {
mCurrentBrightness = progress + MINIMUM_BACKLIGHT;
systemManager.setBrightness(TestBrightness.this,
mCurrentBrightness);
}
});
builder.setTitle(R.string.brightness);
builder.setView(view);
builder.setPositiveButton(android.R.string.ok,
new DialogInterface.OnClickListener() {
@Override
public void onClick(final DialogInterface dialog,
final int which) {
// set brightness
if (mAutomaticAvailable) {
systemManager.saveBrightness(systemManager
.getScreenBrightness());
} else {
systemManager.saveBrightness(mCurrentBrightness);
}
}
});
builder.setNegativeButton(android.R.string.cancel,
new DialogInterface.OnClickListener() {
@Override
public void onClick(final DialogInterface dialog,
final int which) {
// recover brightness
systemManager.setBrightness(TestBrightness.this,
mOldBrightness);
systemManager.saveBrightness(mOldBrightness);
// recover automatic brightness mode
systemManager.setBrightnessMode(mOldAutomatic);
}
});
builder.show();
}
}
brightness.xml文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dip"
android:src="@drawable/btn_auto_brightness_default" >
</ImageView>
<CheckBox
android:id="@+id/auto_brightness"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dip"
android:layout_marginTop="10dip"
android:text="@string/automatic_brightness"
android:textColor="@android:color/white" >
</CheckBox>
<SeekBar
android:id="@+id/brightness_bar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dip"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip"
android:layout_marginTop="20dip" >
</SeekBar>
</LinearLayout>
main.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"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/brightness" android:onClick="onClick"/>
<Button android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/brightness" android:id="@+id/Start"/>
</LinearLayout>
String.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, TestBrightness!</string>
<string name="app_name">TestBrightness</string>
<string name="brightness">亮度</string>
<string name="automatic_brightness">自动亮度</string>
</resources>