Android 设置开放隐性启动Intent，头条面试android

startActivity(new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS));

但是并不是所有的设置界面都可以直接调用，比如说恢复出厂设置的二级界面（packages/apps/Settings/src/com/android/settings/MasterClear.java）。

通过“android.settings.BACKUP_AND_RESET_SETTINGS”调用的只是“备份和重置”一级界面，并不是我需要的恢复出厂。

不过有源码就是任性，完全可以自己开放一个隐性Intent出来，步骤如下：

1.将MasterClear的集成类由Fragment更改为SettingsPreferenceFragment：

— a/packages/apps/Settings/src/com/android/settings/MasterClear.java

+++ b/packages/apps/Settings/src/com/android/settings/MasterClear.java

@@ -44,6 +44,7 @@ import android.widget.CheckBox;

import android.widget.LinearLayout;

import android.widget.TextView;

+import com.android.settings.SettingsPreferenceFragment;

import com.android.settings.Utils;

import com.mediatek.settings.ext.IFactoryExt;

import com.mediatek.xlog.Xlog;

@@ -61,7 +62,7 @@ import java.util.Locale;

• This is the initial screen.

*/

-public class MasterClear extends Fragment {

+public class MasterClear extends SettingsPreferenceFragment {

private static final String TAG = “MasterClear”;

private static final int KEYGUARD_REQUEST = 55;

2.在Settings.java中添加MasterClearActivity，对应步骤1中的MasterClear:

— a/packages/apps/Settings/src/com/android/settings/Settings.java

+++ b/packages/apps/Settings/src/com/android/settings/Settings.java

@@ -455,6 +455,7 @@ public class Settings extends PreferenceActivity

•    MasterClear.class.getName() // add by zms
  

};

@Override

@@ -1370,4 +1371,5 @@ public class Settings extends PreferenceActivity

public static class PrintSettingsActivity extends Settings { /* empty */ }

public static class PrintJobSettingsActivity extends Settings { /* empty */ }

• public static class MasterClearActivity extends Settings { /* empty */ }

}

3.在AndroidManifest.xml中添加接口：

— a/packages/apps/Settings/AndroidManifes

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t.xml

+++ b/packages/apps/Settings/AndroidManifest.xml

@@ -1010,6 +1010,20 @@

android:resource="@id/privacy_settings" />

•           <activity android:name="Settings$MasterClearActivity"
  

•            android:label="@string/master_clear_title"
  

•            android:configChanges="orientation|keyboardHidden|screenSize|mcc|mnc"
  

•            android:launchMode="singleTask"
  

•            android:parentActivityName="Settings">
  

•        <intent-filter>
  

•            <action android:name="android.intent.action.MAIN" />
  

•            <action android:name="android.settings.MASTER_CLEAR" />
  

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

•        </intent-filter>
  

•                   <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
  

•            android:value="com.android.settings.MasterClear" />