安卓如果在setting中添加设置选项

版本：2.3.1
目的：在通话设置菜单下，添加一dect设置菜单，里面再添加一checkBOxPreference
来使能硬件模块。
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目前做的项目，需要在系统settings里面添加一选项来使能硬件模块，里面涉及到的preference知识，请网上了解，这里记录下方法。


1,settings 应用一般在 目录：\packages\apps\Settings,我们先找到通话设置的布局位置，看看它在那个包路径下，进入\packages\apps\Settings\res\xml，打开settings.xml文件：

android:key="call_settings"
settings:icon="@drawable/ic_settings_call"
android:title="@string/call_settings_title">

android:action="android.intent.action.MAIN"
android:targetPackage="com.android.phone"
android:targetClass="com.android.phone.CallFeaturesSetting" />

android:targetPackage="com.android.phone"
android:targetClass="com.android.phone.CallFeaturesSetting"
targetPackage：表示包名，根据此我们可以找到通话设置的路径。
targetClass：表示此布局文件被那个类所引用，根据此类，我们可以知道在那个文件里面管理我们的通话设置功能。
2.根据包名，我们可以看到在\packages\apps\Phone 目录下，进入\res\xml目录下
找到通话布局文件：call_feature_setting.xml，根据类名，很容易找到布局文件。
里面内容如下：

"button_misc_category_key"
android:title="@string/other_settings"
android:persistent="false" />





android:key="dect_settings"
android:title="@string/dect_module_title"
android:summary="@string/dect_module_title" >

android:action="android.intent.action.MAIN"
android:targetPackage="com.android.phone"
android:targetClass="com.android.phone.DectSettings" />



android:key="button_auto_retry_key"
android:title="@string/auto_retry_mode_title"
android:persistent="false"
android:summary="@string/auto_retry_mode_summary"/>

Dect setting 就是新添加进入的设置菜单，我们的原则尽量不大量修改源码，所以添加一个PreferenceScreen，新增一个类文件来管理DECt菜单选项。

android:targetPackage="com.android.phone"
android:targetClass="com.android.phone.DectSettings"
我们指明了包名，类名后，因这是个activity，所以我们需要到Phone目录下修改
AndroidManifest.xml文件，指明启动的activity的类名.

"CdmaCallOptions"
android:label="@string/cdma_options">

"android.intent.action.MAIN" />



"DectSettings"
android:label="@string/dect_module_title">

"android.intent.action.MAIN" />

3.修改好后，我们必须在此activity里添加preference布局文件。
在此目录Phone\res\xml下，新增dect_settings.xml

"1.0" encoding="utf-8"?>
""
android:title="@string/dect_module_title">


android:key="button_dect_module_key"
android:title="@string/dect_module_title"
android:defaultValue="true"
android:summaryOn="@string/dect_module_start"
android:summaryOff="@string/dect_module_stop"
/>

好了，总体布局已经完成
4.在\packages\apps\Phone\src\com\android\phone目录下
新增DectSettings.java文件

加载布局文件：
//dect xml
addPreferencesFromResource(R.xml.dect_settings);
里面涉及到的MidPhoneServce服务，是自己添加的，主要通过此服务的AIDL接口跟硬件打交道。想了解系统服务，请网上查找资料。

源码如下：

package com.android.phone;

import android.content.DialogInterface;
import android.os.AsyncResult;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.preference.CheckBoxPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceScreen;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.content.Context;
import com.android.phone.R;
import android.os.IMidPhoneService;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.provider.Settings;

public class DectSettings extends PreferenceActivity {
private static final String TAG = "DectSettings";

private static final String BUTTON_DECT_KEY = "button_dect_module_key";

private CheckBoxPreference mButtonDect;
public IMidPhoneService midphoneservice = null;

@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);

//dect xml
addPreferencesFromResource(R.xml.dect_settings);

mButtonDect = (CheckBoxPreference)findPreference(BUTTON_DECT_KEY);
mButtonDect.setPersistent(false);

if(mButtonDect != null) {

int dect_state = Settings.System.getInt(
getContentResolver(),Settings.System.DECT_SAVED_STATE, 1);
mButtonDect.setChecked( dect_state!= 0);

Settings.System.putInt(getContentResolver(),
Settings.System.DECT_SAVED_STATE,dect_state);
Log.e(TAG,"settings:------------->" dect_state);
}
}

@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
if (preference == mButtonDect ) {

int dect = mButtonDect.isChecked() ? 1 : 0;
boolean state;
if(dect == 1)
state = true;
else
state = false;
try{
midphoneservice = IMidPhoneService.Stub.asInterface(ServiceManager.getService("midphone"));
Settings.System.putInt(getContentResolver(),
Settings.System.DECT_SAVED_STATE,dect);
midphoneservice.setDectEnabled(state);

Log.e(TAG,"settings:------------->" dect);
} catch (RemoteException e) {
e.printStackTrace();
}
return true;
}
return false;
}

@Override
protected void onResume() {
super.onResume();

if (mButtonDect != null) {
mButtonDect.setChecked(Settings.System.getInt(
getContentResolver(),
Settings.System.DECT_SAVED_STATE, 1) != 0);
}
}
}

package com.android.phone; import android.content.DialogInterface; import android.os.AsyncResult; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.preference.CheckBoxPreference; import android.preference.Preference; import android.preference.PreferenceActivity; import android.preference.PreferenceScreen; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.content.pm.ActivityInfo; import android.content.pm.PackageManager; import android.content.pm.ResolveInfo; import android.os.Bundle; import android.os.Handler; import android.util.Log; import android.content.Context; import com.android.phone.R; import android.os.IMidPhoneService; import android.os.RemoteException; import android.os.ServiceManager; import android.provider.Settings; public class DectSettings extends PreferenceActivity { private static final String TAG = "DectSettings"; private static final String BUTTON_DECT_KEY = "button_dect_module_key"; private CheckBoxPreference mButtonDect; public IMidPhoneService midphoneservice = null; @Override protected void onCreate(Bundle icicle) { super.onCreate(icicle); //dect xml addPreferencesFromResource(R.xml.dect_settings); mButtonDect = (CheckBoxPreference)findPreference(BUTTON_DECT_KEY); mButtonDect.setPersistent(false); if(mButtonDect != null) { int dect_state = Settings.System.getInt( getContentResolver(),Settings.System.DECT_SAVED_STATE, 1); mButtonDect.setChecked( dect_state!= 0); Settings.System.putInt(getContentResolver(), Settings.System.DECT_SAVED_STATE,dect_state); Log.e(TAG,"settings:------------->" dect_state); } } @Override public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) { if (preference == mButtonDect ) { int dect = mButtonDect.isChecked() ? 1 : 0; boolean state; if(dect == 1) state = true; else state = false; try{ midphoneservice = IMidPhoneService.Stub.asInterface(ServiceManager.getService("midphone")); Settings.System.putInt(getContentResolver(), Settings.System.DECT_SAVED_STATE,dect); midphoneservice.setDectEnabled(state); Log.e(TAG,"settings:------------->" dect); } catch (RemoteException e) { e.printStackTrace(); } return true; } return false; } @Override protected void onResume() { super.onResume(); if (mButtonDect != null) { mButtonDect.setChecked(Settings.System.getInt( getContentResolver(), Settings.System.DECT_SAVED_STATE, 1) != 0); } } }
5.编译，烧录。