Android

Question

我有以下用于在我的应用程序中显示 Snackbar 的代码。

#region Snackbar

        private const int SnackbarDuration = 1100;

        /// <summary>
        /// Shows a snackbar. Counts with the fact that there is a CoordinatorLayout with ID coordinatorLayout in your activity layout.
        /// </summary>
        /// <param name="activity"></param>
        /// <param name="text"></param>
        /// <param name="duration"></param>
        public static void ShowSnackbar(Activity activity, string text, int duration = SnackbarDuration)
        {
            StyleAndShowSnackbar(activity, text, duration);
        }

        /// <summary>
        /// Shows a snackbar. Counts with the fact that there is a CoordinatorLayout with ID coordinatorLayout in your activity layout.
        /// </summary>
        /// <param name="activity"></param>
        /// <param name="stringId"></param>
        /// <param name="duration"></param>
        public static void ShowSnackbar(Activity activity, int stringId, int duration = SnackbarDuration)
        {
            StyleAndShowSnackbar(activity, stringId, duration);
        }

        private static void StyleAndShowSnackbar(Activity activity, object stringOrStringId, int duration)
        {
            var snackbarLayout = activity.FindViewById<CoordinatorLayout>(Resource.Id.coordinatorLayout);
            if (snackbarLayout == null) return;

            Snackbar snackbar;
            if (stringOrStringId is int)
                snackbar = Snackbar.Make(snackbarLayout, (int)stringOrStringId, duration);
            else
                snackbar = Snackbar.Make(snackbarLayout, (string)stringOrStringId, duration);

            snackbar.StyleSnackbar();
            snackbar.Show();
            snackbar.Dispose();
            snackbarLayout.Dispose();
        }

        private static void StyleSnackbar(this Snackbar snackbar)
        {
            var snackbarView = (ViewGroup)snackbar.View;
            snackbarView.SetBackgroundColor(Color.LightGray);
            var snackbarTextView = snackbarView.FindViewById<TextView>(Resource.Id.snackbar_text);
            snackbarTextView.SetTextColor(Color.Black);

            snackbarView.Dispose();
            snackbarTextView.Dispose();
        }

        #endregion

这是从我的代码中引用的协调器布局（请注意，它包含在我的布局中 - 它没有单独使用）：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/coordinatorLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true">
</android.support.design.widget.CoordinatorLayout>

在 API 22 上一切正常，直到我在 Android M 和早于 API 22 上测试它（可能不是主要原因）。在调用 Show() 后应用程序崩溃并出现以下异常。

01-01 15:10:45.454 E/AndroidRuntime( 2482): FATAL EXCEPTION: main 01-01 15:10:45.454 E/AndroidRuntime( 2482): Process: com.psonar.android, PID: 2482 01-01 15:10:45.454 E/AndroidRuntime( 2482): java.lang.NullPointerException: Attempt to invoke virtual method 'int android.text.Layout.getLineCount()' on a null object reference 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.support.design.widget.Snackbar$SnackbarLayout.onMeasure(Snackbar.java:707) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.View.measure(View.java:18788) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:610) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.LinearLayout.measureVertical(LinearLay01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:677) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.View.measure(View.java:18788) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.View.measure(View.java:18788) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.View.measure(View.java:18788) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.View.measure(View.java:18788) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.View.measure(View.java:18788) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.View.measure(View.java:18788) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.Choreographer.doCallbacks(Choreographer.java:670) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.Choreographer.doFrame(Choreographer.java:606) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.os.Handler.handleCallback(Handler.java:739) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.os.Handler.dispatchMessage(Handler.java:95) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.os.Looper.loop(Looper.java:148) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at android.app.ActivityThread.main(ActivityThread.java:5417) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at java.lang.reflect.Method.invoke(Native Method) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 01-01 15:10:45.454 E/AndroidRuntime( 2482): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

我尝试从我的代码中删除 Dispose() 调用以查看它是否会产生影响，但它没有。

Answer 1

简单清理解决方案并完全卸载应用程序并重新安装就可以了。

我希望它能有更多的东西，但起初它能工作，然后它停止了，然后清理并重新安装解决了它（对于 Android M，我不得不删除并重新安装设备映像）。

Android - Snackbar - 在调用 Show() 后因致命异常而崩溃

Android - Snackbar - Crashing with FATAL Exception after Show() is called

c#

xamarin

android-snackbar