Question

I’m building a real simple Android app and a lot is going wrong.

I can’t even get a decent Try Catch Everything running. And since the machine I got is hugely underpowered I’m testing directly on my android device but that’s not really working.

The application seems to crash after doing a basic action even using a generic try catch. What am I doing wrong here.

Why is the try catch not catching anything?

This is my Main.xml (a textview and another control are snipped out)

<?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"
    >

 <ImageButton
        android:id="@+id/ib"
        android:layout_width="300dip"
        android:layout_height="50dip"
        android:text="Hello World, MyActivity"
        android:scaleType="fitXY"
        android:onClick="onButtonClicked"
        />

This is my simple code (and the Image isn’t even showing)

public void onButtonClicked(View v) {
    try {
        String strFilePath = "/mnt/sdcard/somefile.jpg";
        if (strFilePath.length() > 0) {

            File file = new File(strFilePath);

            if (file.exists()) {
                ShowToast(strFilePath + "Bestaat");

                ImageButton image = (ImageButton) findViewById(R.id.ib);
                Bitmap bMap = BitmapFactory.decodeFile(strFilePath);
                image.setImageBitmap(bMap);

                ShowToast( "Done");
            } else {
                ShowToast(strFilePath + "Bestaat NIET");
            }
        } else {
            ShowToast(strFilePath + "strFilePath.length() =0");
        }

    } catch (Exception e) {
        HandleError(e);
    }
}

Solution

The files where over 3Mb in size. The ImageButton won’t show pictures that ‘big’ and simply do nothing.
The application probably threw some random out of memory exceptions loading the images taking down the entire app.

Reading a logcat was enough to debug this ‘problem’

Some code that does work (kindly borrowed from other SO questions)

    ImageButton image = (ImageButton) findViewById(R.id.ib);

    Bitmap bMap = BitmapFactory.decodeFile(strFilePath);
    Bitmap bSized = getResizedBitmap(bMap,150,150);
    image.setImageBitmap(bSized);

And

    public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth)                     
    {
      int width = bm.getWidth();
      int height = bm.getHeight();
      float scaleWidth = ((float) newWidth) / width;
      float scaleHeight = ((float) newHeight) / height;

      // create a matrix for the manipulation
      Matrix matrix = new Matrix();

      // resize the bit map
      matrix.postScale(scaleWidth, scaleHeight);

      // recreate the new Bitmap
      Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
      return resizedBitmap;

}

Answer 1

Either you don’t have an ImageButton with that id, or the image you are trying to load is to big to fit in the reduced application memory.