[英]How to show an alert dialog anywhere in my application?
我有一個 android 應用程序,在 BaseActivity 上,我需要檢查一些邏輯並觸發以顯示警報對話框,而不管活動是否打開。 這意味着,無論我在哪個活動類中,警報對話框都應該顯示在該活動的頂部。
確保我所有的活動都擴展了 BaseActivity。
下面是我顯示警報對話框的功能
if (activity != null && !activity.isFinishing()) {
DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext(), R.style.Theme_AppCompat)
.setCancelable(false)
.setMessage("There is some unsynced data. Please connect it to internet and sync it. The user will be logged out if data is not synced for 72 hours")
.setTitle("Attention")
.setPositiveButton("OK", listener);
Dialog dialog = builder.create();
dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
dialog.show();
}
android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3822)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3854)
at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:51)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:145)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6718)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
at android.view.ViewRootImpl.setView(ViewRootImpl.java:798)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:356)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
at android.app.Dialog.show(Dialog.java:329)
at com.gmp_manage_v2.ui.activities.BasePrinterActivity.showAlertToSyncData(BasePrinterActivity.java:463)
at com.gmp_manage_v2.ui.activities.BasePrinterActivity.onResume(BasePrinterActivity.java:304)
at com.gmp_manage_v2.ui.activities.ActiveSessionListActivity.onResume(ActiveSessionListActivity.java:470)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1412)
at android.app.Activity.performResume(Activity.java:7300)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3814)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3854)
at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:51)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:145)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6718)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
您應該使用當前活動上下文而不是應用程序上下文。
改變
new AlertDialog.Builder(getApplicationContext(), R.style.Theme_AppCompat)
到
new AlertDialog.Builder(activity, R.style.Theme_AppCompat)
getApplicationContext()
僅在您使用具有權限的dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT)
時dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT)
使用<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
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