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Add API demo for LocalBroadcastManager.

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Change-Id: Iee1e1189c579ab287718d138916448a02a833e44
This commit is contained in:
Dianne Hackborn
2011-06-24 14:27:36 -07:00
parent e6911c05fc
commit 72ad4eef97
5 changed files with 230 additions and 8 deletions
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9
samples/ApiDemos/AndroidManifest.xml
View File

@@ -36,14 +36,7 @@
<!-- For android.media.audiofx.Visualizer -->
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-sdk android:minSdkVersion="7" android:targetSdkVersion="11" />
<!-- The smallest screen this app works on is a phone. The app will
scale its UI to larger screens but doesn't make good use of them
so allow the compatibility mode button to be shown (mostly because
this is just convenient for testing). -->
<supports-screens android:requiresSmallestWidthDp="320"
android:compatibleWidthLimitDp="480" />
<uses-sdk android:minSdkVersion="3" android:targetSdkVersion="3" />
<!-- We will request access to the camera, saying we require a camera
of some sort but not one with autofocus capability. -->

10
samples/Support4Demos/AndroidManifest.xml
View File

@@ -208,5 +208,15 @@
<provider android:name=".app.LoaderThrottleSupport$SimpleProvider"
android:authorities="com.example.android.apis.supportv4.app.LoaderThrottle" />
<activity android:name=".content.LocalServiceBroadcaster"
android:label="@string/local_service_broadcaster">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="com.example.android.supportv4.SUPPORT4_SAMPLE_CODE" />
</intent-filter>
</activity>
<service android:name=".content.LocalServiceBroadcaster$LocalService"
android:stopWithTask="true" />
</application>
</manifest>

46
samples/Support4Demos/res/layout/local_service_broadcaster.xml Normal file
View File

@@ -0,0 +1,46 @@
<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2011 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.
-->
<!-- Demonstrates starting and stopping a local service.
See corresponding Java code com.android.sdk.app.LocalSerice.java. -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:padding="4dip"
android:gravity="center_horizontal"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView
android:layout_width="match_parent" android:layout_height="wrap_content"
android:layout_weight="0"
android:paddingBottom="4dip"
android:text="@string/local_service_broadcaster_msg"/>
<Button android:id="@+id/start"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="@string/start_service">
<requestFocus />
</Button>
<Button android:id="@+id/stop"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="@string/stop_service">
</Button>
<TextView android:id="@+id/callback"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:layout_weight="0"
android:gravity="center_horizontal" android:paddingTop="4dip"/>
</LinearLayout>

7
samples/Support4Demos/res/values/strings.xml
View File

@@ -93,4 +93,11 @@
<string name="loader_throttle_support">Loader/Throttle</string>
<string name="local_service_broadcaster">Content/Local Service Broadcaster</string>
<string name="local_service_broadcaster_msg">Demonstrates use of LocalBroadcastManager
to communicate from a Service to an Activity.</string>
<string name="start_service">Start Service</string>
<string name="stop_service">Stop Service</string>
</resources>

166
samples/Support4Demos/src/com/example/android/supportv4/content/LocalServiceBroadcaster.java Normal file
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@@ -0,0 +1,166 @@
/*
* Copyright (C) 2011 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.example.android.supportv4.content;
import com.example.android.supportv4.R;
import android.app.Activity;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.support.v4.content.LocalBroadcastManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
/**
* Demonstrates the use of a LocalBroadcastManager to easily communicate
* data from a service to any other interested code.
*/
public class LocalServiceBroadcaster extends Activity {
static final String ACTION_STARTED = "com.example.android.supportv4.STARTED";
static final String ACTION_UPDATE = "com.example.android.supportv4.UPDATE";
static final String ACTION_STOPPED = "com.example.android.supportv4.STOPPED";
LocalBroadcastManager mLocalBroadcastManager;
BroadcastReceiver mReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.local_service_broadcaster);
// This is where we print the data we get back.
final TextView callbackData = (TextView)findViewById(R.id.callback);
// Put in some initial text.
callbackData.setText("No broadcast received yet");
// We use this to send broadcasts within our local process.
mLocalBroadcastManager = LocalBroadcastManager.getInstance(this);
// We are going to watch for interesting local broadcasts.
IntentFilter filter = new IntentFilter();
filter.addAction(ACTION_STARTED);
filter.addAction(ACTION_UPDATE);
filter.addAction(ACTION_STOPPED);
mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(ACTION_STARTED)) {
callbackData.setText("STARTED");
} else if (intent.getAction().equals(ACTION_UPDATE)) {
callbackData.setText("Got update: " + intent.getIntExtra("value", 0));
} else if (intent.getAction().equals(ACTION_STOPPED)) {
callbackData.setText("STOPPED");
}
}
};
mLocalBroadcastManager.registerReceiver(mReceiver, filter);
// Watch for button clicks.
Button button = (Button)findViewById(R.id.start);
button.setOnClickListener(mStartListener);
button = (Button)findViewById(R.id.stop);
button.setOnClickListener(mStopListener);
}
@Override
protected void onDestroy() {
super.onDestroy();
mLocalBroadcastManager.unregisterReceiver(mReceiver);
}
private OnClickListener mStartListener = new OnClickListener() {
public void onClick(View v) {
startService(new Intent(LocalServiceBroadcaster.this, LocalService.class));
}
};
private OnClickListener mStopListener = new OnClickListener() {
public void onClick(View v) {
stopService(new Intent(LocalServiceBroadcaster.this, LocalService.class));
}
};
public static class LocalService extends Service {
LocalBroadcastManager mLocalBroadcastManager;
int mCurUpdate;
static final int MSG_UPDATE = 1;
Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_UPDATE: {
mCurUpdate++;
Intent intent = new Intent(ACTION_UPDATE);
intent.putExtra("value", mCurUpdate);
mLocalBroadcastManager.sendBroadcast(intent);
Message nmsg = mHandler.obtainMessage(MSG_UPDATE);
mHandler.sendMessageDelayed(nmsg, 1000);
} break;
default:
super.handleMessage(msg);
}
}
};
@Override
public void onCreate() {
super.onCreate();
mLocalBroadcastManager = LocalBroadcastManager.getInstance(this);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// Tell any local interested parties about the start.
mLocalBroadcastManager.sendBroadcast(new Intent(ACTION_STARTED));
// Prepare to do update reports.
mHandler.removeMessages(MSG_UPDATE);
Message msg = mHandler.obtainMessage(MSG_UPDATE);
mHandler.sendMessageDelayed(msg, 1000);
return Service.START_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
// Tell any local interested parties about the stop.
mLocalBroadcastManager.sendBroadcast(new Intent(ACTION_STOPPED));
// Stop doing updates.
mHandler.removeMessages(MSG_UPDATE);
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
}