Android完成非活动类中的活动
在我的应用程序中,我正在检查是否存在网络连接;如果没有,则启动一个活动,并在连接恢复时完成该活动。我正在使用广播接收器确定网络连接,但当需要完成该活动时,应用程序正在崩溃,这给了我一个Android完成非活动类中的活动,android,android-activity,android-context,Android,Android Activity,Android Context,在我的应用程序中,我正在检查是否存在网络连接;如果没有,则启动一个活动,并在连接恢复时完成该活动。我正在使用广播接收器确定网络连接,但当需要完成该活动时,应用程序正在崩溃,这给了我一个受限上下文错误 以下是LogCat输出: 01-05 14:22:21.543: E/AndroidRuntime(7064): FATAL EXCEPTION: main 01-05 14:22:21.543: E/AndroidRuntime(7064): java.lang.RuntimeException:
受限上下文错误
以下是LogCat输出:
01-05 14:22:21.543: E/AndroidRuntime(7064): FATAL EXCEPTION: main
01-05 14:22:21.543: E/AndroidRuntime(7064): java.lang.RuntimeException: Unable to start receiver net.evolution.betting.application.ConnectionChangeReceiver: java.lang.ClassCastException: android.app.ReceiverRestrictedContext
01-05 14:22:21.543: E/AndroidRuntime(7064): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2821)
01-05 14:22:21.543: E/AndroidRuntime(7064): at android.app.ActivityThread.access$3200(ActivityThread.java:125)
01-05 14:22:21.543: E/AndroidRuntime(7064): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2083)
01-05 14:22:21.543: E/AndroidRuntime(7064): at android.os.Handler.dispatchMessage(Handler.java:99)
01-05 14:22:21.543: E/AndroidRuntime(7064): at android.os.Looper.loop(Looper.java:123)
01-05 14:22:21.543: E/AndroidRuntime(7064): at android.app.ActivityThread.main(ActivityThread.java:4627)
01-05 14:22:21.543: E/AndroidRuntime(7064): at java.lang.reflect.Method.invokeNative(Native Method)
01-05 14:22:21.543: E/AndroidRuntime(7064): at java.lang.reflect.Method.invoke(Method.java:521)
01-05 14:22:21.543: E/AndroidRuntime(7064): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-05 14:22:21.543: E/AndroidRuntime(7064): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-05 14:22:21.543: E/AndroidRuntime(7064): at dalvik.system.NativeStart.main(Native Method)
01-05 14:22:21.543: E/AndroidRuntime(7064): Caused by: java.lang.ClassCastException: android.app.ReceiverRestrictedContext
01-05 14:22:21.543: E/AndroidRuntime(7064): at net.evolution.betting.application.ConnectionChangeReceiver.onReceive(ConnectionChangeReceiver.java:37)
01-05 14:22:21.543: E/AndroidRuntime(7064): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2810)
01-05 14:22:21.543: E/AndroidRuntime(7064): ... 10 more
以下是课程来源:
public class ConnectionChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive( Context context, Intent intent ) {
ActivityManager activityManager = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningTaskInfo> activitys = activityManager.getRunningTasks(Integer.MAX_VALUE);
boolean isActivityFound = false;
for (int i = 0; i < activitys.size(); i++) {
if (activitys.get(i).topActivity.toString().equalsIgnoreCase("ComponentInfo{net.evolution.betting.application/net.evolution.betting.application.NotationActivity}")) {
isActivityFound = true;
}
}
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService( Context.CONNECTIVITY_SERVICE );
NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
NetworkInfo mobNetInfo = connectivityManager.getNetworkInfo( ConnectivityManager.TYPE_MOBILE );
if ( activeNetInfo != null && isActivityFound == true) {
((NotationActivity)context).finish();
}else if( activeNetInfo == null){
Intent i = new Intent("net.evolution.betting.application.NOTATIONACTIVITY");
i.putExtra("DialogTitle", "Warining!");
i.putExtra("DialogBody", "It seems like your app is not connected to Internet witch is required.Please check your network connection.");
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
}
}
}
公共类ConnectionChangeReceiver扩展了BroadcastReceiver{
@凌驾
公共void onReceive(上下文、意图){
ActivityManager ActivityManager=(ActivityManager)context.getSystemService(context.ACTIVITY_服务);
List activitys=activityManager.getRunningTasks(Integer.MAX_值);
布尔值isActivityFound=false;
对于(inti=0;i
您不能这样做“((NotationActivity)context)”。“上下文”是接收者的上下文,而不是您的NotationActivity的上下文。所以你不能这样施展才能获得活力
有几种方法可以满足您的需要。谷歌“从广播接收器完成活动”。有很多有用的信息可以帮助您找到最适合您的案例的方法。问题在于这一行
((NotationActivity)context).finish();
将接收方作为活动的内部类,这样它就可以访问finish()方法,或者找到从接收方到活动的另一种通信方式