将大图像放入 ImageView 不起作用 [英] Put a big image in an ImageView not working

问题描述

I think there is a problem with my ImageView. i created a gallery, where I can touch an image and put it in my ImageView below:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" 
android:layout_height="fill_parent"
android:background="@drawable/fonddegrade">

<Gallery android:layout_height="wrap_content" 
    android:id="@+id/gallery" 
    android:layout_width="fill_parent" />

<ImageView android:layout_below="@+id/gallery"
    android:layout_height="wrap_content" 
    android:id="@+id/laphoto" 
    android:layout_width="wrap_content" 
    android:layout_centerHorizontal="true"/>

This is perfectly working with small image, but not with big image (3264 * 1952). When I touch it (so, trying to put it in the ImageView), I have an error and my appplication crash. Here is my java code to display the image:

        public void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);
            this.requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.photo);

            File images; // Trouver le bon endroit de stockage
            if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()))
                images = new File("/sdcard/MyPerformance/Photo");
            else
                images = this.getFilesDir();

            images.mkdirs();
            File[] imagelist = images.listFiles(new FilenameFilter(){   
                @Override   
                public boolean accept(File dir, String name)   
                {   
                    return ((name.endsWith(".jpg"))||(name.endsWith(".png")));
                }
            });

            mFiles = new String[imagelist.length];
            for(int i = 0 ; i< imagelist.length; i++)   
            {   
                mFiles[i] = imagelist[i].getAbsolutePath();   
            }
            mUrls = new Uri[mFiles.length];
            for(int i = 0; i < mFiles.length; i++)   
            {   
                mUrls[i] = Uri.parse(mFiles[i]);      
            }

            imgView = (ImageView)findViewById(R.id.laphoto);
            if(mFiles.length != 0)
                imgView.setImageURI(mUrls[0]);

            gallery = (Gallery) findViewById(R.id.gallery);
            gallery.setAdapter(new ImageAdapter(this));

            gallery.setOnItemClickListener(new OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                    imgView.setImageURI(mUrls[position]);
                }
            });
    }

Either the problem comes from the setImageURI (but I don't think this is the cause, since it's work with small image) or because of the size of the picture.

What solution can you give me to resolve this problem? You have my thanks.

PS: Why my "Hello" are always deleted?

解决方案

Your image is probably too big for Android and it goes out of memory. Apps might have as low as 16Mb of usable memory. Your image takes 3264 * 1952 * 4 = ~25.5Mb (widthheightargb). So might be best to resize the images into smaller size.

See: http://android-developers.blogspot.co.uk/2009/01/avoiding-memory-leaks.html
Then: Strange out of memory issue while loading an image to a Bitmap object
Finally: VM running out of memory while getting images from the cache

这篇关于将大图像放入 ImageView 不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！