启动摄像头意图后，在SetContentView（）上发生NullReferenceException

时间：2012-10-19 15:09:55

标签： c# android xamarin.android nullreferenceexception

我只是在HTC设备上遇到了非常奇怪的行为。我的应用程序在除HTC设备之外的所有其他设备上100％工作。

问题发生在我启动相机意图后，我回到之前的布局，然后尝试导航回启动相机意图的活动。我在setContentView()中的OnCreate()方法中得到了一个空引用错误。

我已添加了LaunchCameraIntent和OnActivityResult()个功能。

有人有想法吗？

我已经读过另一个线程，它可能是一个HTC特定的问题，当一个intent从一个活动启动时发生，并且由于某种原因调用垃圾收集器来清除该活动，因此当试图导航回这个结果时在nullreference错误。

这是线程

http://mono-for-android.1047100.n5.nabble.com/Crash-on-HTC-td5710360.html 

protected override void OnCreate (Bundle bundle)
{
   base.OnCreate (bundle);
   this.SetContentView (Resource.Layout.PhotoAccidentCarLayout);
}

private void LaunchCameraIntent (int picType)
    {
        Intent intent = new Intent(Android.Provider.MediaStore.ActionImageCapture);
        MDCarPicStatus.PicUri = ContentResolver.Insert (isMounted ? Android.Provider.MediaStore.Images.Media.ExternalContentUri : Android.Provider.MediaStore.Images.Media.InternalContentUri, new ContentValues ());
        intent.PutExtra (Android.Provider.MediaStore.ExtraOutput, MDCarPicStatus.PicUri);
        intent.PutExtra ("isCamera", true);
        MDCameraHelper.isCamera = true;
        StartActivityForResult (intent, picType);
    }

protected override void OnActivityResult (int requestCode, Result resultCode, Intent data)
    {

        if ((resultCode == Result.Ok)) {
            if (data == null) {
                SaveImage (MDCarPicStatus.PicUri, (PhotoType)requestCode);
            } else {
                if (data.Data == null) {
                    SaveImage (MDCarPicStatus.PicUri, (PhotoType)requestCode);
                } else {
                    SaveImage (data.Data, (PhotoType)requestCode);
                }
            }
        }


        base.OnActivityResult (requestCode, resultCode, data);

    }

这是我的堆栈跟踪

System.NullReferenceException: Object reference not set to an instance of an object
  at (wrapper delegate-invoke) <Module>.invoke_void__this___intptr_intptr_intptr_intptr_JValue[] (intptr,intptr,intptr,intptr,Android.Runtime.JValue[]) <IL 0x00062, 0x00153>
  at Android.Runtime.JNIEnv.CallNonvirtualVoidMethod (intptr,intptr,intptr,Android.Runtime.JValue[]) [0x00000] in /Users/builder/data/lanes/monodroid-mac-monodroid-4.2.6-branch/632e6ddf/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.g.cs:612
  at Android.App.Activity.SetContentView (int) [0x0006b] in /Users/builder/data/lanes/monodroid-mac-monodroid-4.2.6-branch/632e6ddf/source/monodroid/src/Mono.Android/platforms/android-8/src/generated/Android.App.Activity.cs:3119
  at CCIC.MD.PhotoAccidentCarActivity.OnCreate (Android.OS.Bundle) [0x00009] in c:\Work\Sepia\Source\mobipro02.exordia.co.za\CCIC\trunk\CCIC.MD\CCIC.MD\Activities\Claim\PhotoAccidentCarActivity.cs:41
  at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (intptr,intptr,intptr) [0x00010] in /Users/builder/data/lanes/monodroid-mac-monodroid-4.2.6-branch/632e6ddf/source/monodroid/src/Mono.Android/platforms/android-8/src/generated/Android.App.Activity.cs:1490
  at (wrapper dynamic-method) object.2b7db9d6-0abc-4175-b134-cda100e112d6 (intptr,intptr,intptr) <IL 0x00012, 0x00033>

任何人都有任何想法？谢谢。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout     xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/SecondaryAndroidBackgroundNoLogo"
    android:minWidth="25px"
    android:minHeight="25px">
  <LinearLayout
      android:orientation="vertical"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
  android:id="@+id/linearLayout1"
  android:minWidth="25px"
  android:minHeight="25px">
<RelativeLayout
    android:minWidth="25px"
    android:minHeight="25px"
    android:id="@+id/relativeLayout1"
    android:layout_height="match_parent"
    android:layout_width="match_parent">
  <TableLayout
      android:minWidth="25px"
      android:minHeight="25px"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/tableLayout2"
      android:layout_centerInParent="true">
    <TableRow
        android:id="@+id/tableRow2">
      <TableLayout
          android:minWidth="25px"
          android:minHeight="25px"
          android:layout_column="0"
          android:id="@+id/tableLayout3">
        <TableRow
            android:id="@+id/tableRow5"
             android:layout_gravity="center"
            android:minWidth="25px"
            android:minHeight="25px">
          <TextView
              android:text="Front Left"
              android:textAppearance="?android:attr/textAppearanceSmall"
               android:layout_gravity="center"
              android:layout_column="0"
              android:id="@+id/textView44"
              android:textColor="#ff003508" />
        </TableRow>
        <TableRow
            android:id="@+id/tableRow6"
            android:minWidth="25px"
            android:minHeight="25px">

          <ImageView
              android:id="@+id/btnFrontLeftCamera"
              android:layout_width="fill_parent"
              android:layout_height="50sp"
              android:scaleType="fitCenter"
              android:src="@drawable/AndroidCameraImage" />

        </TableRow>
      </TableLayout>
      <TableLayout
          android:minWidth="25px"
          android:minHeight="25px"
          android:layout_column="2"
          android:id="@+id/tableLayout4">
        <TableRow
            android:id="@+id/tableRow7"
             android:layout_gravity="center"
            android:minWidth="25px"
            android:minHeight="25px">
          <TextView
              android:text="Front Right"
               android:layout_gravity="center"
              android:textAppearance="?android:attr/textAppearanceSmall"
              android:layout_column="0"
              android:id="@+id/textView44"
              android:textColor="#ff003508" />
        </TableRow>
        <TableRow
            android:id="@+id/tableRow8"
            android:minWidth="25px"
            android:minHeight="25px">

          <ImageView
              android:id="@+id/btnFrontRightCamera"
              android:layout_width="fill_parent"
              android:layout_height="50sp"
              android:scaleType="center"
              android:src="@drawable/AndroidCameraImage" />

        </TableRow>
      </TableLayout>
    </TableRow>
    <TableRow
        android:id="@+id/tableRow3">
      <TableLayout
          android:minWidth="25px"
          android:minHeight="25px"
          android:layout_column="0"
          android:id="@+id/tableLayout6"
          android:layout_gravity="center">
        <TableRow
            android:id="@+id/tableRow12"
             android:layout_gravity="center"
            android:minWidth="25px"
            android:minHeight="25px">
          <TextView
              android:text="Left Side"
               android:layout_gravity="center"
              android:textAppearance="?android:attr/textAppearanceSmall"
              android:layout_column="0"
              android:id="@+id/textView44"
              android:textColor="#ff003508" />
        </TableRow>
        <TableRow
            android:id="@+id/tableRow13"
            android:minWidth="25px"
            android:minHeight="25px">

          <ImageView
              android:id="@+id/btnLeftSideCamera"
              android:layout_width="fill_parent"
              android:layout_height="50sp"
              android:layout_column="0"
              android:scaleType="center"
              android:src="@drawable/AndroidCameraImage" />

        </TableRow>
      </TableLayout>

      <ImageView
          android:id="@+id/imageView6"
          android:layout_width="100sp"
          android:layout_height="250sp"
          android:layout_column="1"
          android:scaleType="centerInside"
          android:src="@drawable/AndroidCarAlone" />

      <TableLayout
          android:minWidth="25px"
          android:minHeight="25px"
          android:layout_column="2"
          android:id="@+id/tableLayout5"
          android:layout_gravity="center">
        <TableRow
            android:id="@+id/tableRow9"
             android:layout_gravity="center"
            android:minWidth="25px"
            android:minHeight="25px">
          <TextView
              android:text="Right Side"
               android:layout_gravity="center"
              android:textAppearance="?android:attr/textAppearanceSmall"
              android:layout_column="0"
              android:id="@+id/textView44"
              android:textColor="#ff003508" />
        </TableRow>
        <TableRow
            android:id="@+id/tableRow10"
            android:minWidth="25px"
            android:minHeight="25px">

          <ImageView
              android:id="@+id/btnRightSideCamera"
              android:layout_width="fill_parent"
              android:layout_height="50sp"
              android:scaleType="center"
              android:src="@drawable/AndroidCameraImage" />

        </TableRow>
      </TableLayout>
    </TableRow>
    <TableRow
        android:id="@+id/tableRow4">
      <TableLayout
          android:minWidth="25px"
          android:minHeight="25px"
          android:layout_column="0"
          android:id="@+id/tableLayout7">
        <TableRow
            android:id="@+id/tableRow14"
             android:layout_gravity="center"
            android:minWidth="25px"
            android:minHeight="25px">
          <TextView
              android:text="Back Left"
               android:layout_gravity="center"
              android:textAppearance="?android:attr/textAppearanceSmall"
              android:layout_column="0"
              android:id="@+id/textView44"
              android:textColor="#ff003a03" />
        </TableRow>
        <TableRow
            android:id="@+id/tableRow15"
            android:minWidth="25px"
            android:minHeight="25px">

          <ImageView
              android:id="@+id/btnBackLeftCamera"
              android:layout_width="fill_parent"
              android:layout_height="50sp"
              android:layout_column="0"
              android:scaleType="center"
              android:src="@drawable/AndroidCameraImage" />

        </TableRow>
      </TableLayout>
      <TableLayout
          android:minWidth="25px"
          android:minHeight="25px"
          android:layout_column="2"
          android:id="@+id/tableLayout8">
        <TableRow
            android:id="@+id/tableRow16"
             android:layout_gravity="center"
            android:minWidth="25px"
            android:minHeight="25px">
          <TextView
              android:text="Back Right"
               android:layout_gravity="center"
              android:textAppearance="?android:attr/textAppearanceSmall"
              android:layout_column="0"
              android:id="@+id/textView44"
              android:textColor="#ff003a03" />
        </TableRow>
        <TableRow
            android:id="@+id/tableRow17"
            android:minWidth="25px"
            android:minHeight="25px">

          <ImageView
              android:id="@+id/btnBackRightCamera"
              android:layout_width="fill_parent"
              android:layout_height="50sp"
              android:scaleType="center"
              android:src="@drawable/AndroidCameraImage" />

        </TableRow>
      </TableLayout>
    </TableRow>
    <LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="80sp"
android:id="@+id/linearLayout1"
android:minWidth="25px"
android:minHeight="25px"/>
  </TableLayout>
</RelativeLayout>

0 个答案:

没有答案
相关问题
最新问题