Java tutorial
/* * Copyright (C) 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.example.notificationlistener; import android.app.AlertDialog; import android.app.ListActivity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.provider.Settings.Secure; import android.service.notification.StatusBarNotification; import android.support.v4.content.LocalBroadcastManager; import android.util.Log; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.FrameLayout; import android.widget.TextView; import java.util.HashMap; import java.util.HashSet; import java.util.List; public class NotificationListenerActivity extends ListActivity { private static final String LISTENER_PATH = "com.android.example.notificationlistener/" + "com.android.example.notificationlistener.Listener"; private static final String TAG = "NotificationListenerActivity"; private Button mLaunchButton; private TextView mEmptyText; private StatusAdaptor mStatusAdaptor; private final BroadcastReceiver mRefreshListener = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Log.i(TAG, "update tickle"); updateList(intent.getStringExtra(Listener.EXTRA_KEY)); } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setTitle(R.string.long_app_name); setContentView(R.layout.main); mLaunchButton = (Button) findViewById(R.id.launch_settings); mEmptyText = (TextView) findViewById(android.R.id.empty); mStatusAdaptor = new StatusAdaptor(this); setListAdapter(mStatusAdaptor); } @Override protected void onStop() { LocalBroadcastManager.getInstance(this).unregisterReceiver(mRefreshListener); super.onStop(); } @Override public void onStart() { super.onStart(); final IntentFilter intentFilter = new IntentFilter(Listener.ACTION_REFRESH); LocalBroadcastManager.getInstance(this).registerReceiver(mRefreshListener, intentFilter); updateList(null); } @Override public void onResume() { super.onResume(); checkEnabled(); } protected void onActivityResult(int requestCode, int resultCode, Intent data) { checkEnabled(); } private void checkEnabled() { String listeners = Secure.getString(getContentResolver(), "enabled_notification_listeners"); if (listeners != null && listeners.contains(LISTENER_PATH)) { mLaunchButton.setText(R.string.launch_to_disable); mEmptyText.setText(R.string.waiting_for_content); } else { mLaunchButton.setText(R.string.launch_to_enable); mEmptyText.setText(R.string.nothing_to_see); AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage(R.string.explanation).setTitle(R.string.disabled); builder.setPositiveButton(R.string.enable_it, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { launchSettings(null); } }); builder.setNegativeButton(R.string.cancel, null); builder.create().show(); } } public void launchSettings(View v) { startActivityForResult(new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS"), 0); } public void dismiss(View v) { Log.d(TAG, "clicked dismiss "); Object tag = v.getTag(); if (tag instanceof StatusBarNotification) { StatusBarNotification sbn = (StatusBarNotification) tag; Log.d(TAG, " on " + sbn.getKey()); LocalBroadcastManager.getInstance(this) .sendBroadcast(new Intent(Listener.ACTION_DISMISS).putExtra(Listener.EXTRA_KEY, sbn.getKey())); } } public void launch(View v) { Log.d(TAG, "clicked launch"); Object tag = v.getTag(); if (tag instanceof StatusBarNotification) { StatusBarNotification sbn = (StatusBarNotification) tag; Log.d(TAG, " on " + sbn.getKey()); LocalBroadcastManager.getInstance(this) .sendBroadcast(new Intent(Listener.ACTION_LAUNCH).putExtra(Listener.EXTRA_KEY, sbn.getKey())); } } private void updateList(String key) { if (mStatusAdaptor.requiresInitialization()) { final List<StatusBarNotification> notifications = Listener.getNotifications(); if (notifications != null) { mStatusAdaptor.init(notifications); } } mStatusAdaptor.update(key); } private class StatusAdaptor extends BaseAdapter { private final Context mContext; private List<StatusBarNotification> mNotifications; private HashMap<String, Long> mKeyToId; private HashSet<String> mKeys; private long mNextId; private HashMap<String, View> mRecycledViews; private String mUpdateKey; public StatusAdaptor(Context context) { mContext = context; mKeyToId = new HashMap<String, Long>(); mKeys = new HashSet<String>(); mNextId = 0; mRecycledViews = new HashMap<String, View>(); } @Override public int getCount() { return mNotifications == null ? 0 : mNotifications.size(); } @Override public Object getItem(int position) { return mNotifications.get(position); } @Override public boolean hasStableIds() { return true; } @Override public long getItemId(int position) { final StatusBarNotification sbn = mNotifications.get(position); final String key = sbn.getKey(); if (!mKeyToId.containsKey(key)) { mKeyToId.put(key, mNextId); mNextId++; } return mKeyToId.get(key); } @Override public View getView(int position, View view, ViewGroup list) { if (view == null) { view = View.inflate(mContext, R.layout.item, null); } FrameLayout container = (FrameLayout) view.findViewById(R.id.remote_view); View dismiss = view.findViewById(R.id.dismiss); StatusBarNotification sbn = mNotifications.get(position); View child; if (container.getTag() instanceof StatusBarNotification && container.getChildCount() > 0) { // recycle the view StatusBarNotification old = (StatusBarNotification) container.getTag(); if (sbn.getKey().equals(mUpdateKey)) { //this view is out of date, discard it mUpdateKey = null; } else { View content = container.getChildAt(0); container.removeView(content); mRecycledViews.put(old.getKey(), content); } } child = mRecycledViews.get(sbn.getKey()); if (child == null) { child = sbn.getNotification().contentView.apply(mContext, null); } container.setTag(sbn); container.removeAllViews(); container.addView(child); dismiss.setVisibility(sbn.isClearable() ? View.VISIBLE : View.GONE); dismiss.setTag(sbn); return view; } public void update(String key) { if (mNotifications != null) { synchronized (mNotifications) { mKeys.clear(); for (int i = 0; i < mNotifications.size(); i++) { mKeys.add(mNotifications.get(i).getKey()); } mKeyToId.keySet().retainAll(mKeys); } if (key == null) { mRecycledViews.clear(); } else { mUpdateKey = key; mRecycledViews.remove(key); } Log.d(TAG, "notifyDataSetChanged"); notifyDataSetChanged(); } else { Log.d(TAG, "missed and update"); } } public boolean requiresInitialization() { return mNotifications == null; } public void init(List<StatusBarNotification> notifications) { mNotifications = notifications; } } }