編輯：關於Android編程
設置——提示音和通知——通知使用權。
詳細界面如圖：
存在需要擁有通知使用權應用時：
不存在需要擁有通知使用權應用時：
用戶為應用勾選復選框後系統彈dialog需要用戶進一步確認時：
/packages/apps/Settings/src/com/android/settings/notification/NotificationAccessSettings.java
/packages/apps/Settings/src/com/android/settings/notification/ManagedServiceSettings.java
data/data/com.android.providers.settings
public class NotificationAccessSettings extends ManagedServiceSettings {
private static final String TAG = NotificationAccessSettings.class.getSimpleName();
private static final Config CONFIG = getNotificationListenerConfig();
private static Config getNotificationListenerConfig() {
final Config c = new Config();
c.tag = TAG;
/*Settings.Secure.ENABLED_NOTIFICATION_LISTENERS =
*數據庫字段，通過讀取數據庫中字段判斷應用是否有通知使用權，有則界面中應用對應的checkbox為勾選狀態，
*應用對應checkbox不勾選時，時用戶勾選後會有提示框彈出，確定後通過此字段向數據庫寫入此應用信息。
* */
c.setting = Settings.Secure.ENABLED_NOTIFICATION_LISTENERS;
c.intentAction = NotificationListenerService.SERVICE_INTERFACE;
/*
* 應用需要在manifest文件中聲明這個服務權限才會被檢測到， 才會顯示到同時使用權界面
* */
c.permission = android.Manifest.permission.BIND_NOTIFICATION_LISTENER_SERVICE;
c.noun = "notification listener";
/*用戶勾選後彈出的dialog中的標題*/
c.warningDialogTitle = R.string.notification_listener_security_warning_title;
/*用戶勾選後彈出的dialog中的內容*/
c.warningDialogSummary = R.string.notification_listener_security_warning_summary;
/*當前系統中不存在任何需要使用通知使用權的應用時，通知使用權界面會有相應提示*/
c.emptyText = R.string.no_notification_listeners;
return c;
}
@Override
protected Config getConfig() {
return CONFIG;
}
public static int getListenersCount(PackageManager pm) {
return getServicesCount(CONFIG, pm);
}
public static int getEnabledListenersCount(Context context) {
return getEnabledServicesCount(CONFIG, context);
}
}
/packages/apps/Settings/src/com/android/settings/notification/ManagedServiceSettings.java
public abstract class ManagedServiceSettings extends ListFragment {
private static final boolean SHOW_PACKAGE_NAME = false;
private final Config mConfig;
private PackageManager mPM;
private ContentResolver mCR;
private final HashSet mEnabledServices = new HashSet();
private ServiceListAdapter mListAdapter;
abstract protected Config getConfig();
public ManagedServiceSettings() {
mConfig = getConfig();
}
private final ContentObserver mSettingsObserver = new ContentObserver(new Handler()) {
@Override
public void onChange(boolean selfChange, Uri uri) {
updateList();
}
};
/*監聽到應用的數量增減等改變時需要更新應用列表*/
private final BroadcastReceiver mPackageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
updateList();
}
};
/*用戶勾選後彈出對應dialog等待用戶進一步確認要為此應用打開通知使用權*/
public class ScaryWarningDialogFragment extends DialogFragment {
static final String KEY_COMPONENT = "c";
static final String KEY_LABEL = "l";
public ScaryWarningDialogFragment setServiceInfo(ComponentName cn, String label) {
Bundle args = new Bundle();
args.putString(KEY_COMPONENT, cn.flattenToString());
args.putString(KEY_LABEL, label);
setArguments(args);
return this;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final Bundle args = getArguments();
final String label = args.getString(KEY_LABEL);
final ComponentName cn = ComponentName.unflattenFromString(args.getString(KEY_COMPONENT));
final String title = getResources().getString(mConfig.warningDialogTitle, label);
final String summary = getResources().getString(mConfig.warningDialogSummary, label);
return new AlertDialog.Builder(getActivity())
.setMessage(summary)
.setTitle(title)
.setCancelable(true)
.setPositiveButton(android.R.string.ok,//
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
mEnabledServices.add(cn);//添加應用信息到HashSet中
saveEnabledServices();//數據庫寫操作
}
})
.setNegativeButton(android.R.string.cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// pass
}
})
.create();
}
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
mPM = getActivity().getPackageManager();
mCR = getActivity().getContentResolver();
mListAdapter = new ServiceListAdapter(getActivity());
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.managed_service_settings, container, false);
TextView empty = (TextView) v.findViewById(android.R.id.empty);
empty.setText(mConfig.emptyText);
return v;
}
@Override
public void onResume() {
super.onResume();
updateList();
// listen for package changes
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_PACKAGE_ADDED);//應用添加
filter.addAction(Intent.ACTION_PACKAGE_CHANGED);//應用改變
filter.addAction(Intent.ACTION_PACKAGE_REMOVED);//應用卸載
filter.addAction(Intent.ACTION_PACKAGE_REPLACED);//應用更新
filter.addDataScheme("package");
getActivity().registerReceiver(mPackageReceiver, filter);
mCR.registerContentObserver(Settings.Secure.getUriFor(mConfig.setting),
false, mSettingsObserver);
}
@Override
public void onPause() {
super.onPause();
getActivity().unregisterReceiver(mPackageReceiver);
mCR.unregisterContentObserver(mSettingsObserver);
}
/*從數據庫中加載擁有通知使用權的應用，並將其信息存入到HashSet中。*/
private void loadEnabledServices() {
mEnabledServices.clear();//首先清空HashSet，確保數據最新從數據庫讀取
final String flat = Settings.Secure.getString(mCR, mConfig.setting);//數據庫讀操作
if (flat != null && !"".equals(flat)) {
final String[] names = flat.split(":");
for (int i = 0; i < names.length; i++) {
final ComponentName cn = ComponentName.unflattenFromString(names[i]);
if (cn != null) {
mEnabledServices.add(cn);
}
}
}
}
/*數據庫存操作*/
private void saveEnabledServices() {
StringBuilder sb = null;
for (ComponentName cn : mEnabledServices) {
if (sb == null) {
sb = new StringBuilder();
} else {
sb.append(':');
}
sb.append(cn.flattenToString());
}
/*數據庫存操作*/
Settings.Secure.putString(mCR,
mConfig.setting,
sb != null ? sb.toString() : "");
}
/*更新應用顯示列表*/
private void updateList() {
loadEnabledServices();
getServices(mConfig, mListAdapter, mPM);
mListAdapter.sort(new PackageItemInfo.DisplayNameComparator(mPM));
getListView().setAdapter(mListAdapter);
}
protected static int getEnabledServicesCount(Config config, Context context) {
final String flat = Settings.Secure.getString(context.getContentResolver(), config.setting);
if (flat == null || "".equals(flat)) return 0;
final String[] components = flat.split(":");
return components.length;
}
protected static int getServicesCount(Config c, PackageManager pm) {
return getServices(c, null, pm);
}
private static int getServices(Config c, ArrayAdapter adapter, PackageManager pm) {
int services = 0;
if (adapter != null) {
adapter.clear();
}
final int user = ActivityManager.getCurrentUser();
List installedServices = pm.queryIntentServicesAsUser(
new Intent(c.intentAction),
PackageManager.GET_SERVICES | PackageManager.GET_META_DATA,
user);
for (int i = 0, count = installedServices.size(); i < count; i++) {
ResolveInfo resolveInfo = installedServices.get(i);
ServiceInfo info = resolveInfo.serviceInfo;
if (!c.permission.equals(info.permission)) {
Slog.w(c.tag, "Skipping " + c.noun + " service "
+ info.packageName + "/" + info.name
+ ": it does not require the permission "
+ c.permission);
continue;
}
if (adapter != null) {
adapter.add(info);
}
services++;
}
return services;
}
private boolean isServiceEnabled(ServiceInfo info) {
final ComponentName cn = new ComponentName(info.packageName, info.name);
return mEnabledServices.contains(cn);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
ServiceInfo info = mListAdapter.getItem(position);
final ComponentName cn = new ComponentName(info.packageName, info.name);
if (mEnabledServices.contains(cn)) {
//取消勾選
// the simple version: disabling
mEnabledServices.remove(cn);
saveEnabledServices();
} else {
//選擇勾選後填出dialog
// show a scary dialog
new ScaryWarningDialogFragment()
.setServiceInfo(cn, info.loadLabel(mPM).toString())
.show(getFragmentManager(), "dialog");
}
}
private static class ViewHolder {
ImageView icon;
TextView name;
CheckBox checkbox;
TextView description;
}
/*用於應用列表加載顯示*/
private class ServiceListAdapter extends ArrayAdapter {
final LayoutInflater mInflater;
ServiceListAdapter(Context context) {
super(context, 0, 0);
mInflater = (LayoutInflater)
getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public boolean hasStableIds() {
return true;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View v;
if (convertView == null) {
v = newView(parent);
} else {
v = convertView;
}
bindView(v, position);
return v;
}
public View newView(ViewGroup parent) {
View v = mInflater.inflate(R.layout.managed_service_item, parent, false);
ViewHolder h = new ViewHolder();
h.icon = (ImageView) v.findViewById(R.id.icon);//應用圖標
h.name = (TextView) v.findViewById(R.id.name);//應用名
h.checkbox = (CheckBox) v.findViewById(R.id.checkbox);//勾選框
h.description = (TextView) v.findViewById(R.id.description);//應用描述
v.setTag(h);
return v;
}
public void bindView(View view, int position) {
ViewHolder vh = (ViewHolder) view.getTag();
ServiceInfo info = getItem(position);
vh.icon.setImageDrawable(info.loadIcon(mPM));
vh.name.setText(info.loadLabel(mPM));
if (SHOW_PACKAGE_NAME) {
vh.description.setText(info.packageName);
vh.description.setVisibility(View.VISIBLE);
} else {
vh.description.setVisibility(View.GONE);
}
vh.checkbox.setChecked(isServiceEnabled(info));
}
}
protected static class Config {
String tag;
String setting;
String intentAction;
String permission;
String noun;
int warningDialogTitle;
int warningDialogSummary;
int emptyText;
}}
數據庫字段對應應用信息格式：包名/service：包名/service。兩應用間信息用”：“隔開。
