How to solve the Out of Memory issue while displaying image in android?

问题

I am working on a quiz application. In that I am displaying the question and options in a list. I have kept a next button at the top and when the next button is clicked, I am calling the same page again and again until the test is over. Since some questions consist of images I am displaying a button below the question and when the button is clicked, the image will be displayed in the new page. Now my problem is sometimes when I click on the button to display the image it is displaying outofmemory exception.

image.java

public class image extends Activity {

    ImageView myimgview;
    ImageView buttondismiss;

    public static String image_url;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.image);

        Intent intent = getIntent();
        image_url = intent.getStringExtra(List.IMAGE_NAME);

        buttondismiss = (ImageView) findViewById(R.id.dismiss1);

        myimgview = (ImageView) findViewById(R.id.imageView100);

        int in = image_url.indexOf(".");
        String index = Integer.toString(in);
        String picturename = image_url.substring(0, in);

        int imageResource = getResources().getIdentifier(picturename,"drawable", "com.quiz.test");                                              // getPackageName());
        myimgview = (ImageView) findViewById(R.id.imageView100);
        myimgview.setImageResource(imageResource);

    }


}

Logcat:

08-18 11:11:01.063: E/AndroidRuntime(552): FATAL EXCEPTION: main
08-18 11:11:01.063: E/AndroidRuntime(552): java.lang.OutOfMemoryError
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:483)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:351)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:773)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.content.res.Resources.loadDrawable(Resources.java:1937)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.content.res.Resources.getDrawable(Resources.java:664)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.widget.ImageView.resolveUri(ImageView.java:542)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.widget.ImageView.setImageResource(ImageView.java:315)
08-18 11:11:01.063: E/AndroidRuntime(552):  at com.quiz.test.image.onCreate(image.java:48)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.app.Activity.performCreate(Activity.java:4465)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.app.ActivityThread.access$600(ActivityThread.java:122)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.os.Looper.loop(Looper.java:137)
08-18 11:11:01.063: E/AndroidRuntime(552):  at android.app.ActivityThread.main(ActivityThread.java:4340)
08-18 11:11:01.063: E/AndroidRuntime(552):  at java.lang.reflect.Method.invokeNative(Native Method)
08-18 11:11:01.063: E/AndroidRuntime(552):  at java.lang.reflect.Method.invoke(Method.java:511)
08-18 11:11:01.063: E/AndroidRuntime(552):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-18 11:11:01.063: E/AndroidRuntime(552):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-18 11:11:01.063: E/AndroidRuntime(552):  at dalvik.system.NativeStart.main(Native Method)

The error is showing at the line myimgview.setImageResource(imageResource);. I didnt get what is the the problem. I kept upto 400 images in my drawable folder because I need all those images in my project. Anybody please help me with this issue. I am struggling with this issue. Any help will be greatly appreciated.

回答1:

Use smaller images. That's it. Try reducing image size before using it.

回答2:

The OutOfMemory Error occurs when some of the images may be too large to display.

To fix this you do something like this:

BitmapFactory.Options options=new BitmapFactory.Options();
options.inSampleSize = 8;
Bitmap preview_bitmap=BitmapFactory.decodeStream(is,null,options);

回答3:

Scale down the images to the ImageView's dimensions based on the screen size before displaying them so that you don't display a high res image on a low res screen. It will save a lot of memory.

回答4:

This may help you to reduce size of an Image pragmatically

public Bitmap decodeFile(File f) {
    try {
        // Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(f), null, o);
        // The new size we want to scale to
        final int REQUIRED_SIZE = 70;

        // Find the correct scale value. It should be the power of 2.
        int scale = 1;
        while (o.outWidth / scale / 2 >= REQUIRED_SIZE
                && o.outHeight / scale / 2 >= REQUIRED_SIZE)
            scale *= 2;
        // Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
    } catch (FileNotFoundException e) {
    }
    return null;
}

来源：https://stackoverflow.com/questions/12016716/how-to-solve-the-out-of-memory-issue-while-displaying-image-in-android

标签

android

out-of-memory