无法在Imageview中显示图像

Question

I'm trying to display a image in the imageview.

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ImageView imageView = (ImageView)findViewById(R.id.imageView1);
    try {
        File imgFile = new File("C:\\photos\\a.jpg");
        Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
                    if (myBitmap == null) {
            Log.e("BITMAP", "myBitmap is NULL");
        }
        imageView.setImageBitmap(myBitmap);         
    }catch (Exception e) {
        e.printStackTrace();
    }
}

I can see the error message "myBitmap is NULL". Is there anything i need to do, to ensure the path is recognized.

Thanks!

Answer 1

The path "C:\\\\photos\\\\a.jpg" refers to a path in your Windows system, and this is invalid. Android doesn't know anything about Windows.

You need to put the file in your resources directory or your assets directory, and provide the path accordingly.

Answer 2

try this : place image in assets folder and then:

private Bitmap getBitmapFromAsset(String strName)
{
    AssetManager assetManager = getAssets();
    InputStream istr = null;
    try {
        istr = assetManager.open(strName);
    } catch (IOException e) {
        e.printStackTrace();
    }
    Bitmap bitmap = BitmapFactory.decodeStream(istr);
    return bitmap;
}

and then set image Bitmap in imageView as:

imageView.setImageBitmap(getBitmapFromAsset("fileName")); 

Or if image file is on SD card then try this :

File f = new File("/mnt/sdcard/photo.jpg");
Bitmap bmp = BitmapFactory.decodeFile(f.getAbsolutePath());
imageView.setImageBitmap(bmp);

hope this will help you.