Settings 布局简析

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Android M

布局

packages/apps/Settings/res/layout/dashboard.xml

装载dashboard-category的一个容器

packages/apps/Settings/res/layout/dashboard_categories.xml

dashboard category

packages/apps/Settings/res/layout/dashboard_tile.xml

dashboard-tile布局

<dashboard-category

android:id="@+id/device_section"

android:title="@string/header_category_device" >

<dashboard-tile

android:id="@+id/storage_settings"

android:title="@string/storage_settings"

android:fragment="com.android.settings.deviceinfo.Memory"

android:icon="@drawable/ic_settings_storage"

。。。。。。

</dashboard-category>

元素dashboard-category 指一类别

元素dashboard-tile指类别中的某一项

android:fragment="com.android.settings.deviceinfo.Memory"指定对应的activity

package/app/Settings/res/device_info_memory.xml指定android:fragment布局文件

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"

android:title="@string/storage_settings"

settings:keywords="@string/keywords_storage">

</PreferenceScreen>

代码

加载dashboard-category容器布局

packages/apps/Settings/src/com/android/settings/dashboard/ DashboardSummary.java

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

mExt = UtilsExt.getMiscPlugin(this.getActivity());

mLayoutInflater = inflater;

final View rootView = inflater.inflate(R.layout.dashboard, container, false);

mDashboard = (ViewGroup) rootView.findViewById(R.id.dashboard_container);

return rootView;

}

循环加载dashboard-category和dashboard-tile

packages/apps/Settings/src/com/android/settings/dashboard/ DashboardSummary.java

private void rebuildUI(Context context) {

List<DashboardCategory> categories =

((SettingsActivity) context).getDashboardCategories(true);

final int count = categories.size();

for (int n = 0; n < count; n++) {

DashboardCategory category = categories.get(n);

View categoryView = mLayoutInflater.inflate(R.layout.dashboard_category, mDashboard,

false);

TextView categoryLabel = (TextView) categoryView.findViewById(R.id.category_title);

categoryLabel.setText(category.getTitle(res));

ViewGroup categoryContent =

(ViewGroup) categoryView.findViewById(R.id.category_content);

final int tilesCount = category.getTilesCount();

for (int i = 0; i < tilesCount; i++) {

DashboardTile tile = category.getTile(i);

。。。。。。。。

}

。。。。。。。。

}

fragment 继承关系

点击DashboardTile跳转到对应fragment activity，从ENTRY_FRAGMENTS找或直接指定名字。

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

public class Settings extends SettingsActivity {

。。。。。。。。。。。

public static class HomeSettingsActivity extends SettingsActivity { /* empty */ }

public static class DisplaySettingsActivity extends SettingsActivity { /* empty */ }

public static class DeviceInfoSettingsActivity extends SettingsActivity { /* empty */ }

。。。。。。。。。。。。。

}

packages/apps/Settings/src/com/android/settings/SettingsActivity.java

private static final int MSG_BUILD_CATEGORIES = 1;

private Handler mHandler = new Handler() {

@Override

public void handleMessage(Message msg) {

switch (msg.what) {

case MSG_BUILD_CATEGORIES: {

final boolean forceRefresh = msg.getData().getBoolean(MSG_DATA_FORCE_REFRESH);

if (forceRefresh) {

buildDashboardCategories(mCategories);

}

} break;

}

};

private void buildDashboardCategories(List<DashboardCategory> categories) {

categories.clear();

loadCategoriesFromResource(R.xml.dashboard_categories, categories);

updateTilesList(categories);

}

private void updateTilesList(List<DashboardCategory> target) {

final int size = target.size();

for (int i = 0; i < size; i++) {

DashboardCategory category = target.get(i);

// Ids are integers, so downcasting is ok

int id = (int) category.id;

int n = category.getTilesCount() - 1;

while (n >= 0) {

DashboardTile tile = category.getTile(n);

boolean removeTile = false;

id = (int) tile.id;

if (id == R.id.operator_settings || id == R.id.manufacturer_settings) {

if (!Utils.updateTileToSpecificActivityFromMetaDataOrRemove(this, tile)) {

removeTile = true;

}

if (UserHandle.MU_ENABLED && UserHandle.myUserId() != 0

&& !ArrayUtils.contains(SETTINGS_FOR_RESTRICTED, id)) {

removeTile = true;

}

。。。。。。。。

if (removeTile && n < category.getTilesCount()) {

category.removeTile(n);

}

n--;

}

private int[] SETTINGS_FOR_RESTRICTED = {

R.id.wireless_section,

R.id.wifi_settings,

R.id.bluetooth_settings,

R.id.data_usage_settings,

。。。。。。

}

private static final String[] ENTRY_FRAGMENTS = {

WirelessSettings.class.getName(),

WifiSettings.class.getName(),

AdvancedWifiSettings.class.getName(),

SavedAccessPointsWifiSettings.class.getName(),

BluetoothSettings.class.getName(),

DeviceInfoSettings.class.getName(),

TetherSettings.class.getName(),

。。。。。。。。

}

protected void onCreate(Bundle savedState) {

。。。。。。。。。。。

switchToFragment(DashboardSummary.class.getName(), null, false, false,

mInitialTitleResId, mInitialTitle, false);

。。。。。。。。

}

点击DashboardTile跳转到对应fragment activity，从ENTRY_FRAGMENTS找或直接指定名字。

在AndroidManifest.xml 中meta-data 将DeviceInfoSettingsActivity 与DeviceInfoSettings关联起来

<activity android:name="Settings$DeviceInfoSettingsActivity"

<intent-filter>

</intent-filter>

android:value="com.android.settings.DeviceInfoSettings" />

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

android:value="true" />

</activity>

函数updateTilesList(List<DashboardCategory> target)参数List<DashboardCategory> target代表package/app/Settings/xml/dashboard_categories.xml

DashboardCategory category = target.get(i);代表元素dashboard-category指定的一类别

DashboardTile tile = category.getTile(n);代表元素dashboard-tile指类别中的一项

接下来是对整个dashboard_categories.xml进行循环解析，以确定哪些dashboard-tile需要隐藏还是要显示。

最后将需要显示的dashboard-category判断是否存在数组SETTINGS_FOR_RESTRICTED中，以进一步判断是否隐藏还是显示

if (UserHandle.MU_ENABLED && UserHandle.myUserId() != 0

&& !ArrayUtils.contains(SETTINGS_FOR_RESTRICTED, id)) {

removeTile = true;

}

AndroidN 上有写差别，布局都是动态的，其它的一样。

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