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/*
* Copyright (C) 2010 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.phone.common;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Looper;
import android.provider.CallLog.Calls;
/**
* Class to access the call log asynchronously to avoid carrying out database operations on the
* UI thread, using an {@link AsyncTask}.
*
* <pre class="prettyprint">
* Typical usage:
* ==============
*
* // From an activity...
* String mLastNumber = "";
*
* CallLogAsync log = new CallLogAsync();
*
* CallLogAsync.GetLastOutgoingCallArgs lastCallArgs = new CallLogAsync.GetLastOutgoingCallArgs(
* this, new CallLogAsync.OnLastOutgoingCallComplete() {
* public void lastOutgoingCall(String number) { mLastNumber = number; }
* });
* log.getLastOutgoingCall(lastCallArgs);
* </pre>
*
*/
public class CallLogAsync {
private static final String TAG = "CallLogAsync";
/**
* Parameter object to hold the args to get the last outgoing call
* from the call log DB.
*/
public static class GetLastOutgoingCallArgs {
public GetLastOutgoingCallArgs(Context context,
OnLastOutgoingCallComplete callback) {
this.context = context;
this.callback = callback;
}
public final Context context;
public final OnLastOutgoingCallComplete callback;
}
/** Interface to retrieve the last dialed number asynchronously. */
public interface OnLastOutgoingCallComplete {
/** @param number The last dialed number or an empty string if
* none exists yet. */
void lastOutgoingCall(String number);
}
/**
* CallLog.getLastOutgoingCall(...)
*/
public AsyncTask getLastOutgoingCall(GetLastOutgoingCallArgs args) {
assertUiThread();
return new GetLastOutgoingCallTask(args.callback).execute(args);
}
/**
* AsyncTask to get the last outgoing call from the DB.
*/
private class GetLastOutgoingCallTask extends AsyncTask<GetLastOutgoingCallArgs, Void, String> {
private final OnLastOutgoingCallComplete mCallback;
private String mNumber;
public GetLastOutgoingCallTask(OnLastOutgoingCallComplete callback) {
mCallback = callback;
}
// Happens on a background thread. We cannot run the callback
// here because only the UI thread can modify the view
// hierarchy (e.g enable/disable the dial button). The
// callback is ran rom the post execute method.
@Override
protected String doInBackground(GetLastOutgoingCallArgs... list) {
int count = list.length;
String number = "";
for (GetLastOutgoingCallArgs args : list) {
// May block. Select only the last one.
number = Calls.getLastOutgoingCall(args.context);
}
return number; // passed to the onPostExecute method.
}
// Happens on the UI thread, it is safe to run the callback
// that may do some work on the views.
@Override
protected void onPostExecute(String number) {
assertUiThread();
mCallback.lastOutgoingCall(number);
}
}
private void assertUiThread() {
if (!Looper.getMainLooper().equals(Looper.myLooper())) {
throw new RuntimeException("Not on the UI thread!");
}
}
}
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