Null Pointer exception in ImageView

Question

I am trying to display an image from my phone using ImageView. Here is my ImageActivity activity:

package com.example.apptest1;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View; 
import android.widget.ImageView;

public class ImageActivity extends Activity {

private static final int REQUEST_CODE = 0;
private Bitmap bitmap;
private ImageView imageView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_image);
     ImageView imageView = (ImageView) findViewById(R.id.result);

}

public void pickImage(View View) {
    Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    intent.addCategory(Intent.CATEGORY_OPENABLE);
    startActivityForResult(intent, REQUEST_CODE);
}

 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        InputStream stream = null;
        if (requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK)
          try {
            // recyle unused bitmaps
            if (bitmap != null) {
              bitmap.recycle();
            }
            stream = getContentResolver().openInputStream(data.getData());
            bitmap = BitmapFactory.decodeStream(stream);

            imageView.setImageBitmap(bitmap);
          } catch (FileNotFoundException e) {
            e.printStackTrace();
          } finally {
            if (stream != null)
              try {
                stream.close();
              } catch (IOException e) {
                e.printStackTrace();
              }
          }
      }



 }

And here is the activity_image.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="${relativePackage}.${activityClass}" 
android:orientation="vertical">


<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="pickImage"
    android:text="Button" >
</Button>

<ImageView
    android:id="@+id/result"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     >
</ImageView>


</LinearLayout>

But when I try to run the application,it displays the below logcat and stops abruptly LogCat:

    05-28 23:11:48.226: E/AndroidRuntime(6115): FATAL EXCEPTION: main
05-28 23:11:48.226: E/AndroidRuntime(6115): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null,  request=0, result=-1, data=Intent { dat=content://media/external/images/media/1242 flg=0x1 }} to activity   {com.example.apptest1/com.example.apptest1.ImageActivity}: java.lang.NullPointerException
05-28 23:11:48.226: E/AndroidRuntime(6115):     at android.app.ActivityThread.deliverResults(ActivityThread.java:3525)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at android.app.ActivityThread.handleSendResult(ActivityThread.java:3568)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at android.app.ActivityThread.access$1100(ActivityThread.java:162)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1412)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at android.os.Handler.dispatchMessage(Handler.java:107)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at android.os.Looper.loop(Looper.java:194)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at android.app.ActivityThread.main(ActivityThread.java:5371)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at java.lang.reflect.Method.invokeNative(Native Method)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at java.lang.reflect.Method.invoke(Method.java:525)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run   (ZygoteInit.java:833)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at dalvik.system.NativeStart.main(Native Method)
05-28 23:11:48.226: E/AndroidRuntime(6115): Caused by: java.lang.NullPointerException
05-28 23:11:48.226: E/AndroidRuntime(6115):     at com.example.apptest1.ImageActivity.onActivityResult(ImageActivity.java:48)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at android.app.Activity.dispatchActivityResult(Activity.java:5311)
05-28 23:11:48.226: E/AndroidRuntime(6115):     at android.app.ActivityThread.deliverResults(ActivityThread.java:3521)
05-28 23:11:48.226: E/AndroidRuntime(6115):     ... 11 more

I have debuged and checked that ImageView is null but not able to figure out why/how.Can someone please clear my doubt.Thanks in advance

Aify · Accepted Answer · 2015-05-28 17:51:46Z

3

Simple scope issue.

This line

ImageView imageView = (ImageView) findViewById(R.id.result);

needs to be

imageView = (ImageView) findViewById(R.id.result);

Why? Because the way you're doing it now means that you've declared a new imageView instead of using the one already declared previously. You've left that previously declared imageView untouched, and instead made a brand new one that's absolutely useless and dissapears after the onCreate() finishes. When you call imageView.setImageBitmap(bitmap);, you'll get an NPE because it tries to use the imageView declared in your class.

answered May 28, 2015 at 17:51

Aify

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Comments

Avinash Anand · Accepted Answer · 2015-05-28 17:58:39Z

1

in your onCreate method you are creating a local variable by:-

ImageView imageView = (ImageView) findViewById(R.id.result);

That hides your global imageView member. So, do below in onCreate:-

imageView = (ImageView) findViewById(R.id.result);

And the null pointer should go.

answered May 28, 2015 at 17:58

Avinash Anand

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