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117 lines
4.0 KiB
117 lines
4.0 KiB
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.phone.common;
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import android.content.Context;
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import android.os.AsyncTask;
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import android.os.Looper;
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import android.provider.CallLog.Calls;
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/**
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* Class to access the call log asynchronously to avoid carrying out database operations on the
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* UI thread, using an {@link AsyncTask}.
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*
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* <pre class="prettyprint">
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* Typical usage:
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* ==============
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*
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* // From an activity...
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* String mLastNumber = "";
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*
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* CallLogAsync log = new CallLogAsync();
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*
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* CallLogAsync.GetLastOutgoingCallArgs lastCallArgs = new CallLogAsync.GetLastOutgoingCallArgs(
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* this, new CallLogAsync.OnLastOutgoingCallComplete() {
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* public void lastOutgoingCall(String number) { mLastNumber = number; }
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* });
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* log.getLastOutgoingCall(lastCallArgs);
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* </pre>
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*
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*/
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public class CallLogAsync {
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private static final String TAG = "CallLogAsync";
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/**
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* Parameter object to hold the args to get the last outgoing call
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* from the call log DB.
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*/
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public static class GetLastOutgoingCallArgs {
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public GetLastOutgoingCallArgs(Context context,
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OnLastOutgoingCallComplete callback) {
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this.context = context;
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this.callback = callback;
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}
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public final Context context;
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public final OnLastOutgoingCallComplete callback;
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}
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/** Interface to retrieve the last dialed number asynchronously. */
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public interface OnLastOutgoingCallComplete {
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/** @param number The last dialed number or an empty string if
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* none exists yet. */
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void lastOutgoingCall(String number);
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}
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/**
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* CallLog.getLastOutgoingCall(...)
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*/
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public AsyncTask getLastOutgoingCall(GetLastOutgoingCallArgs args) {
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assertUiThread();
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return new GetLastOutgoingCallTask(args.callback).execute(args);
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}
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/**
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* AsyncTask to get the last outgoing call from the DB.
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*/
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private class GetLastOutgoingCallTask extends AsyncTask<GetLastOutgoingCallArgs, Void, String> {
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private final OnLastOutgoingCallComplete mCallback;
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private String mNumber;
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public GetLastOutgoingCallTask(OnLastOutgoingCallComplete callback) {
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mCallback = callback;
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}
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// Happens on a background thread. We cannot run the callback
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// here because only the UI thread can modify the view
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// hierarchy (e.g enable/disable the dial button). The
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// callback is ran rom the post execute method.
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@Override
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protected String doInBackground(GetLastOutgoingCallArgs... list) {
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int count = list.length;
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String number = "";
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for (GetLastOutgoingCallArgs args : list) {
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// May block. Select only the last one.
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number = Calls.getLastOutgoingCall(args.context);
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}
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return number; // passed to the onPostExecute method.
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}
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// Happens on the UI thread, it is safe to run the callback
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// that may do some work on the views.
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@Override
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protected void onPostExecute(String number) {
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assertUiThread();
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mCallback.lastOutgoingCall(number);
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}
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}
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private void assertUiThread() {
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if (!Looper.getMainLooper().equals(Looper.myLooper())) {
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throw new RuntimeException("Not on the UI thread!");
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}
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}
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}
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