android-如何在收到广播意图CONNECTIVITY_CHANGE后更新小部件
作者：互联网
每当网络数据包数据连接更改时,我想更新小部件文本及其颜色.即使该小部件也可以启用/禁用网络数据包数据.
android.net.conn.CONNECTIVITY_CHANGE的广播接收器已在Android清单文件中注册,并且onReceive()在AppWidgetProvider类中已被覆盖.
每当启用/禁用onReceive()连接两次触发时,我都会注意到一个非常奇怪的行为.在第一个实例中,我收到NetworkInfo对象,但在第二个实例中,我没有收到info实例.
但是,当我通过系统设置启用/禁用连接时,就会触发一次onReceive(),并且NetworkInfo对象为null.
这是我的清单文件.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.rakesh.simplewidget"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10" />
<!-- Permissions -->
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<!-- Widget Broadcast receiver -->
<receiver
android:name=".ExampleAppWidgetProvider"
android:label="Widget ErrorBuster" >
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/widget1_info" />
</receiver>
<service android:name=".UpdateWidgetService"></service>
</application>
</manifest>
我的AppWidgetProvider类如下.
public class ExampleAppWidgetProvider extends AppWidgetProvider {
int[] mAppWidgetIds;
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
final int N = appWidgetIds.length;
this.mAppWidgetIds = appWidgetIds;
// Get all ids
ComponentName thisWidget = new ComponentName(context,
ExampleAppWidgetProvider.class);
int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
// Build the intent to call the service
Intent intent = new Intent(context.getApplicationContext(),
UpdateWidgetService.class);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, allWidgetIds);
// Update the widgets via the service
context.startService(intent);
}
@Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
NetworkInfo info = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
StringBuilder str = new StringBuilder();
if (info != null) {
str.append(" info is NULL");
}
if (checkConnectivityState(context)) {
str.append("; data is enable");
} else {
str.append("; data is disable");
}
Toast.makeText(context, str, Toast.LENGTH_SHORT).show();
}
public static void updateAppWidget(Context context,
int[] appWidgetIds, boolean enable) {
if (appWidgetIds == null) {
return;
}
if (appWidgetIds.length > 0) {
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
RemoteViews updateViews = new RemoteViews(context.getPackageName(), R.layout.widget1);
if (enable) {
updateViews.setTextColor(R.id.BtEnableDisable, Color.GREEN);
updateViews.setTextViewText(R.id.BtEnableDisable, "Enabled");
} else {
updateViews.setTextColor(R.id.BtEnableDisable, Color.GRAY);
updateViews.setTextViewText(R.id.BtEnableDisable, "Disabled");
}
appWidgetManager.updateAppWidget(appWidgetIds, updateViews);
Toast.makeText(context, "updateAppWidget() ", Toast.LENGTH_SHORT).show();
}
}
private boolean checkConnectivityState(Context context) {
final TelephonyManager telephonyManager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
return telephonyManager.getDataState() == TelephonyManager.DATA_CONNECTED;
}
}
启用/禁用网络数据包数据连接的服务类.
public class UpdateWidgetService extends Service {
private static final String LOG = "de.vogella.android.widget.example";
@Override
public void onStart(Intent intent, int startId) {
Log.i(LOG, "Called");
// Create some random data
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this
.getApplicationContext());
int[] allWidgetIds = intent
.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);
ComponentName thisWidget = new ComponentName(getApplicationContext(),
ExampleAppWidgetProvider.class);
int[] allWidgetIds2 = appWidgetManager.getAppWidgetIds(thisWidget);
Log.w(LOG, "From Intent" + String.valueOf(allWidgetIds.length));
Log.w(LOG, "Direct" + String.valueOf(allWidgetIds2.length));
for (int widgetId : allWidgetIds) {
// Create some random data
int number = (new Random().nextInt(100));
RemoteViews remoteViews = new RemoteViews(this
.getApplicationContext().getPackageName(),
R.layout.widget1);
Log.w("WidgetExample", String.valueOf(number));
EnableDisableConnectivity edConn = new EnableDisableConnectivity(this.getApplicationContext());
edConn.enableDisableDataPacketConnection(!checkConnectivityState(this.getApplicationContext()));
// Register an onClickListener
Intent clickIntent = new Intent(this.getApplicationContext(),
ExampleAppWidgetProvider.class);
clickIntent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
clickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS,
allWidgetIds);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, clickIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
remoteViews.setOnClickPendingIntent(R.id.BtEnableDisable, pendingIntent);
appWidgetManager.updateAppWidget(widgetId, remoteViews);
}
stopSelf();
super.onStart(intent, startId);
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
private boolean checkConnectivityState(Context context){
final TelephonyManager telephonyManager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
return telephonyManager.getDataState() == TelephonyManager.DATA_CONNECTED;
}
}
我还尝试了一个Broadcast Receiver类,在那里,只要连接发生更改,我都会收到NetworkInfo.但是我不知道如何从广播接收器更新小部件的文本/颜色.
收到CONNECTIVITY_CHANGE意向后,还有其他方法可以更新小部件的文本/颜色吗？
编辑：
我不知道为什么我在AppWidgetProvider中得到两个CONNECTIVITY_CHANGE意图,但是我要学习如何从广播接收器更新窗口小部件,下面是代码.
public class ConnectivityReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
NetworkInfo info = (NetworkInfo)intent.getExtras().get(ConnectivityManager.EXTRA_NETWORK_INFO);
if(info.getType() == ConnectivityManager.TYPE_MOBILE){
RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
R.layout.widget1);
if(info.isConnectedOrConnecting()){
Toast.makeText(context, "Data packet enabled", Toast.LENGTH_SHORT).show();
Log.d("RK","Mobile data is enabled");
remoteViews.setTextColor(R.id.BtEnableDisable, Color.GREEN);
remoteViews.setTextViewText(R.id.BtEnableDisable, "Enabled");
}else{
Toast.makeText(context, "Data packet disabled", Toast.LENGTH_SHORT).show();
Log.e("RK","Mobile data is disconnected");
remoteViews.setTextColor(R.id.BtEnableDisable, Color.BLACK);
remoteViews.setTextViewText(R.id.BtEnableDisable,"Disabled");
}
ComponentName thiswidget = new ComponentName(context, ExampleAppWidgetProvider.class);
AppWidgetManager manager = AppWidgetManager.getInstance(context);
manager.updateAppWidget(thiswidget, remoteViews);
}
}
}
如果有人知道为什么我有两个CONNECTIVITY_CHANGE意图,请在这里分享您的想法.您的帮助在这里将不胜感激.
解决方法:
现在,我发现了为什么单击按钮以启用/禁用网络时onReceive()被调用两次.
1.第一次在APPWIDGET_UPDATE意向广播时被调用.
2.第二次在CONNECTIVITY_CHANGE意向广播时被调用.
无论如何,我能够从广播接收器更新窗口小部件,源代码已发布在上述文章中.
标签：android-intent,intentfilter,android-widget,android 来源： https://codeday.me/bug/20191101/1981606.html