Android7.0 Settings主菜单添加一条item

往Android7.0的settings的主菜单里添加一条item. N与M的Settings不同,在M上只要找到Settings里面的相应的布局添加就好,但在N上由于Setting里面的item不再受布局控制,所以得在代码中添加.
找到/packages/apps/Settings/src/com/android/settings/SettingsActivity.java
在settingsActivity.java里面的private void doUpdateTilesList() {}添加代码才会显示在Settings的item里面,具体如下:

private void doUpdateTilesList() {//add startsetTileEnabled(new ComponentName(packageName,Settings.WtkSecurityLockersActivity.class.getName()),getResources().getBoolean(R.bool.show_security_lock), isAdmin, pm);//add  end}
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这里添加了这段代码之后就可以显示在settings的item里面了,具体还有以下的一些完善:在SettingsActivity.java里面的

private String[] SETTINGS_FOR_RESTRICTED = {//add  startSettings.WtkSecurityLockersActivity.class.getName(),//add  end    };private static final String[] ENTRY_FRAGMENTS = {//add  startWtkSecurityLockers.class.getName(),//add  end    };packages/apps/Settings/src/com/android/settings/Settings.java里面加public static class WtkSecurityLockersActivity extends SettingsActivity { /* empty */ }packages/apps/Settings/AndroidManifest.xml里面加:<!--add  (start)-->    <!-- A: WtkSecurityLockers Settings -->        <activity android:name="Settings$WtkSecurityLockersActivity"                    android:label="@string/security_locker"                    android:icon="@drawable/ic_wtk_securitylocker">                <intent-filter android:priority="4">                    <action android:name="com.android.settings.action.SETTINGS" />                </intent-filter>                <meta-data android:name="com.android.settings.category"                    android:value="com.android.settings.category.system" />                <meta-data android:name="com.android.settings.FRAGMENT_CLASS"                    android:value="com.android.settings.WtkSecurityLockers" />                <meta-data android:name="com.android.settings.title"                           android:resource="@string/security_locker" />                <meta-data android:name="com.android.settings.icon"                           android:resource="@drawable/ic_wtk_securitylocker" />           </activity>    <!-- A: WtkSecurityLockers Settings -->    <!--add (end)-->packages/apps/Settings/src/com/android/settings/下面添加一个类:package com.android.settings;import com.android.settings.R;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.support.v7.preference.Preference;import android.support.v7.preference.PreferenceScreen;import android.support.v14.preference.SwitchPreference;import android.util.Log;import android.os.SystemProperties;import android.provider.Settings;import com.android.internal.logging.MetricsProto.MetricsEvent;public class WtkSecurityLockers extends SettingsPreferenceFragment             implements Preference.OnPreferenceChangeListener, Preference.OnPreferenceClickListener{    private static final String KEY_SECURITY_LOCKER = "security_lockers";    @Override    public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         Log.e("lcg","KEY_SECURITY_LOCKER = "+KEY_SECURITY_LOCKER);         Intent intent = new Intent().setClassName("com.wtk.wtksecuritylocker", "com.wtk.wtksecuritylocker.LockerListActivity");         intent.putExtra(KEY_SECURITY_LOCKER,true);         startActivity(intent);         getActivity().finish();     }     @Override     public void onResume() {     super.onResume();     }    @Override    public boolean onPreferenceClick(Preference preference) {         // TODO Auto-generated method stub         return false;    }    @Override    public boolean onPreferenceChange(Preference preference, Object newValue) {        // TODO Auto-generated method stub        return false;    }    @Override    public boolean onPreferenceTreeClick(Preference preference) {        // TODO Auto-generated method stub        return super.onPreferenceTreeClick(preference);    }    @Override    protected int getMetricsCategory() {        // TODO Auto-generated method stub        return  MetricsEvent.DEVICEINFO_STORAGE;    }}
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至此就可以在Settings里面的主菜单界面添加一个item,点击该item就会进入我们想进的界面.
附上:packages/apps/Settings/src/com/android/settings/SettingsActivity.java

private void setTileEnabled(ComponentName component, boolean enabled, boolean isAdmin,                                PackageManager pm) {        if (UserHandle.MU_ENABLED && !isAdmin && getPackageName().equals(component.getPackageName())                && !ArrayUtils.contains(SETTINGS_FOR_RESTRICTED, component.getClassName())) {            enabled = false;        }        setTileEnabled(component, enabled);    }frameworks\base\packages\SettingsLib\src\com\android\settingslib\drawer\SettingsDrawerActivity.java里面public void setTileEnabled(ComponentName component, boolean enabled) {        PackageManager pm = getPackageManager();        int state = pm.getComponentEnabledSetting(component);        boolean isEnabled = state == PackageManager.COMPONENT_ENABLED_STATE_ENABLED;if (isEnabled != enabled || state == PackageManager.COMPONENT_ENABLED_STATE_DEFAULT) {            if (enabled) {                sTileBlacklist.remove(component);            } else {                sTileBlacklist.add(component);            } pm.setComponentEnabledSetting(component, enabled                    ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED                    : PackageManager.COMPONENT_ENABLED_STATE_DISABLED,                    PackageManager.DONT_KILL_APP);            new CategoriesUpdater().execute();        }    }
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由此可见往Android7.0的Settingsk里添加item不需要布局,至于为什么,还有待继续研究.