在GridView组件中显示多个图像时,Android应用程序崩溃

时间:2013-06-28 17:10:48

标签: java android memory-leaks android-gridview

我是这个网站的新手,我在这里是因为我无法在其他任何地方找到这个答案,所以我想看看能否得到一些帮助!

我的项目中有一个GridView以及一个Image Adapter。我需要以下代码的帮助:

package com.humanoid.sigma;

import android.app.Activity;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {
private Context mContext;


public Integer[] Tattoos = {
        R.drawable.tattoo1, R.drawable.tattoo2,
        R.drawable.tattoo3, R.drawable.tattoo4,
        R.drawable.tattoo5, /*R.drawable.tattoo6,
        R.drawable.tattoo7, R.drawable.tattoo8,
        R.drawable.tattoo9, R.drawable.tattoo10, 
        R.drawable.tattoo11, R.drawable.tattoo12,
        R.drawable.tattoo13, R.drawable.tattoo14,
        R.drawable.tattoo15, R.drawable.tattoo16,
        R.drawable.tattoo17, R.drawable.tattoo18,
        R.drawable.tattoo19, R.drawable.tattoo20, 
        R.drawable.tattoo21, R.drawable.tattoo22,
        R.drawable.tattoo23, R.drawable.tattoo24,
        R.drawable.tattoo25, R.drawable.tattoo26,
        R.drawable.tattoo27, R.drawable.tattoo28,
        R.drawable.tattoo29, R.drawable.tattoo30, 
        R.drawable.tattoo31, R.drawable.tattoo32,
        R.drawable.tattoo33, R.drawable.tattoo34,
        R.drawable.tattoo35, R.drawable.tattoo36,
        R.drawable.tattoo37, R.drawable.tattoo38,
        R.drawable.tattoo39, R.drawable.tattoo40, 
        R.drawable.tattoo41, R.drawable.tattoo42,
        R.drawable.tattoo43, R.drawable.tattoo44,
        R.drawable.tattoo45, R.drawable.tattoo46,
        R.drawable.tattoo47, R.drawable.tattoo48,
        R.drawable.tattoo49, R.drawable.tattoo50, 
        R.drawable.tattoo51, R.drawable.tattoo52,
        R.drawable.tattoo53, R.drawable.tattoo54,
        R.drawable.tattoo55, R.drawable.tattoo56,
        R.drawable.tattoo57, R.drawable.tattoo58,
        R.drawable.tattoo59, R.drawable.tattoo60, 
        R.drawable.tattoo61, R.drawable.tattoo62,
        R.drawable.tattoo63, R.drawable.tattoo64,
        R.drawable.tattoo65, R.drawable.tattoo66,
        R.drawable.tattoo67, R.drawable.tattoo68,
        R.drawable.tattoo69, R.drawable.tattoo70, 
        R.drawable.tattoo71, R.drawable.tattoo72,
        R.drawable.tattoo73, R.drawable.tattoo74,
        R.drawable.tattoo75, R.drawable.tattoo76,
        R.drawable.tattoo77, R.drawable.tattoo78,
        R.drawable.tattoo79, R.drawable.tattoo80,
        R.drawable.tattoo81, R.drawable.tattoo82,*/

};

// Constructor
public ImageAdapter(Context c){
    mContext = c;
}

public int getCount() {
    return Tattoos.length;
}

public Object getItem(int position) {
    return Tattoos[position];
}

public long getItemId(int position) {
    return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ImageView imageView = new ImageView(mContext);
    imageView.setImageResource(Tattoos[position]);
    imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
    imageView.setLayoutParams(new GridView.LayoutParams(100, 70));
    return imageView;
}

}

Logcat堆栈跟踪:

  

06-28 17:51:14.104:E / AndroidRuntime(818):致命异常:主06-28   17:51:14.104:E / AndroidRuntime(818):
  java.lang.OutOfMemoryError 06-28 17:51:14.104:E / AndroidRuntime(818):     在
  android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:502)   06-28 17:51:14.104:E / AndroidRuntime(818):at   android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:355)   06-28 17:51:14.104:E / AndroidRuntime(818):at   android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:785)   06-28 17:51:14.104:E / AndroidRuntime(818):at   android.content.res.Resources.loadDrawable(Resources.java:1965)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.content.res.Resources.getDrawable(Resources.java:660)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.widget.ImageView.resolveUri(ImageView.java:616)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.widget.ImageView.setImageResource(ImageView.java:349)06-28   17:51:14.104:E / AndroidRuntime(818):at   com.humanoid.sigma.ImageAdapter.getView(ImageAdapter.java:80)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.widget.AbsListView.obtainView(AbsListView.java:2143)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.widget.GridView.makeAndAddView(GridView.java:1341)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.widget.GridView.makeRow(GridView.java:341)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.widget.GridView.fillDown(GridView.java:283)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.widget.GridView.fillFromTop(GridView.java:417)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.widget.GridView.layoutChildren(GridView.java:1229)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.widget.AbsListView.onLayout(AbsListView.java:1994)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.view.View.layout(View.java:14003)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.view.ViewGroup.layout(ViewGroup.java:4375)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.widget.RelativeLayout.onLayout(RelativeLayout.java:985)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.view.View.layout(View.java:14003)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.view.ViewGroup.layout(ViewGroup.java:4375)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.widget.FrameLayout.onLayout(FrameLayout.java:448)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.view.View.layout(View.java:14003)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.view.ViewGroup.layout(ViewGroup.java:4375)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.widget.LinearLayout.setChildFrame(LinearLayout.java:1663)   06-28 17:51:14.104:E / AndroidRuntime(818):at   android.widget.LinearLayout.layoutVertical(LinearLayout.java:1521)   06-28 17:51:14.104:E / AndroidRuntime(818):at   android.widget.LinearLayout.onLayout(LinearLayout.java:1434)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.view.View.layout(View.java:14003)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.view.ViewGroup.layout(ViewGroup.java:4375)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.widget.FrameLayout.onLayout(FrameLayout.java:448)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.view.View.layout(View.java:14003)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.view.ViewGroup.layout(ViewGroup.java:4375)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1892)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1711)   06-28 17:51:14.104:E / AndroidRuntime(818):at   android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.view.ViewRootImpl $ TraversalRunnable.run(ViewRootImpl.java:4351)   06-28 17:51:14.104:E / AndroidRuntime(818):at   android.view.Choreographer $ CallbackRecord.run(Choreographer.java:749)   06-28 17:51:14.104:E / AndroidRuntime(818):at   android.view.Choreographer.doCallbacks(Choreographer.java:562)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.view.Choreographer.doFrame(Choreographer.java:532)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.view.Choreographer $ FrameDisplayEventReceiver.run(Choreographer.java:735)   06-28 17:51:14.104:E / AndroidRuntime(818):at   android.os.Handler.handleCallback(Handler.java:725)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.os.Handler.dispatchMessage(Handler.java:92)06-28   17:51:14.104:E / AndroidRuntime(818):at   android.os.Looper.loop(Looper.java:137)06-28 17:51:14.104:   E / AndroidRuntime(818):at   android.app.ActivityThread.main(ActivityThread.java:5039)06-28   17:51:14.104:E / AndroidRuntime(818):at   java.lang.reflect.Method.invokeNative(Native Method)06-28   17:51:14.104:E / AndroidRuntime(818):at   java.lang.reflect.Method.invoke(Method.java:511)06-28 17:51:14.104:   E / AndroidRuntime(818):at   com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:793)   06-28 17:51:14.104:E / AndroidRuntime(818):at   com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)06-28   17:51:14.104:E / AndroidRuntime(818):at   dalvik.system.NativeStart.main(原生方法)

Gallery.Java代码:

package com.humanoid.sigma;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class Gallery extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gallery);

    GridView gridView = (GridView) findViewById(R.id.photos);

    // Instance of ImageAdapter Class
    gridView.setAdapter(new ImageAdapter(this));
    gridView.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View v,
                int position, long id) {

            // Sending image id to FullScreenActivity
            Intent i = new Intent(getApplicationContext(), FullScreen.class);
            // passing array index
            i.putExtra("id", position);
            startActivity(i);
        }
    });
}
}

从上面可以看出,我已经评论了什么不适合我。我不知道是不是因为我为这个GridView拍了太多照片但它很烦人。一旦我评论了这些图像,程序运行正常,但如果我删除/ *并运行程序并选择图库,它只会显示黑屏。它崩溃后不久。

请帮我处理这些我一直在寻找的代码,但无法找到帮助。

1 个答案:

答案 0 :(得分:3)

您的问题是由于在分配可绘制资源时堆大小耗尽而引起的(这是一个常见问题,因为此类操作需要大量内存)。

当我尝试过你的代码时,我得到了java.lang.OutOfMemoryError: bitmap size exceeds VM budget。这是一个简单易懂的错误信息。

然后我做了一些研究,并在官方Android Dev网站上发现了一个“原生”主题:http://developer.android.com/training/displaying-bitmaps/index.html关于位图以及如何在应用程序中进行有效资源分配的示例。

所以我尝试了它并结合你的代码,这就是我得到的:

ImageAdapter.java

package com.humanoid.sigma;

import android.app.Activity;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {
private Context mContext;


public Integer[] Tattoos = {
        R.drawable.tattoo1, R.drawable.tattoo2,
        R.drawable.tattoo3, R.drawable.tattoo4,
        R.drawable.tattoo5, R.drawable.tattoo6,
        R.drawable.tattoo7, R.drawable.tattoo8,
        R.drawable.tattoo9, R.drawable.tattoo10, 
        R.drawable.tattoo11, R.drawable.tattoo12,
        R.drawable.tattoo13, R.drawable.tattoo14,
        R.drawable.tattoo15, R.drawable.tattoo16,
        R.drawable.tattoo17, R.drawable.tattoo18,
        R.drawable.tattoo19, R.drawable.tattoo20, 
        R.drawable.tattoo21, R.drawable.tattoo22,
        R.drawable.tattoo23, R.drawable.tattoo24,
        R.drawable.tattoo25, R.drawable.tattoo26,
        R.drawable.tattoo27, R.drawable.tattoo28,
        R.drawable.tattoo29, R.drawable.tattoo30, 
        R.drawable.tattoo31, R.drawable.tattoo32,
        R.drawable.tattoo33, R.drawable.tattoo34,
        R.drawable.tattoo35, R.drawable.tattoo36,
        R.drawable.tattoo37, R.drawable.tattoo38,
        R.drawable.tattoo39, R.drawable.tattoo40, 
        R.drawable.tattoo41, R.drawable.tattoo42,
        R.drawable.tattoo43, R.drawable.tattoo44,
        R.drawable.tattoo45, R.drawable.tattoo46,
        R.drawable.tattoo47, R.drawable.tattoo48,
        R.drawable.tattoo49, R.drawable.tattoo50, 
        R.drawable.tattoo51, R.drawable.tattoo52,
        R.drawable.tattoo53, R.drawable.tattoo54,
        R.drawable.tattoo55, R.drawable.tattoo56,
        R.drawable.tattoo57, R.drawable.tattoo58,
        R.drawable.tattoo59, R.drawable.tattoo60, 
        R.drawable.tattoo61, R.drawable.tattoo62,
        R.drawable.tattoo63, R.drawable.tattoo64,
        R.drawable.tattoo65, R.drawable.tattoo66,
        R.drawable.tattoo67, R.drawable.tattoo68,
        R.drawable.tattoo69, R.drawable.tattoo70, 
        R.drawable.tattoo71, R.drawable.tattoo72,
        R.drawable.tattoo73, R.drawable.tattoo74,
        R.drawable.tattoo75, R.drawable.tattoo76,
        R.drawable.tattoo77, R.drawable.tattoo78,
        R.drawable.tattoo79, R.drawable.tattoo80,
        R.drawable.tattoo81, R.drawable.tattoo82

};

// Constructor
public ImageAdapter(Context c){
    mContext = c;
}

public int getCount() {
    return Tattoos.length;
}

public Object getItem(int position) {
    return Tattoos[position];
}

public long getItemId(int position) {
    return 0;
}

public View getView(int position, View convertView, ViewGroup parent) {
    //This actually is a bad solution, because every time convertView is reused, you will still initialize new ImageView, which is wrong
    //ImageView imageView = new ImageView(this.mContext);
    //new BitmapWorkerTask(imageView).execute(Tattoos[position]);
    //return imageView;

    //Better solution
    ImageView imageView = null;

    if (convertView == null) {
        imageView = new ImageView(this.mContext);
        new BitmapWorkerTask(imageView).execute(Tattoos[position]);
        //create new ImageView if it is not present and populate it with some image
    } else {
        imageView = (ImageView) convertView;
        //re-use ImageView that already exists in memory
    }

return imageView;
}


class BitmapWorkerTask extends AsyncTask<Integer, Void, Bitmap> {
        private final WeakReference<ImageView> imageViewReference;
        private int data = 0;

        public BitmapWorkerTask(ImageView imageView) {
            // Use a WeakReference to ensure the ImageView can be garbage collected
            imageViewReference = new WeakReference<ImageView>(imageView);
        }

        // Decode image in background.
        @Override
        protected Bitmap doInBackground(Integer... params) {
            data = params[0];
            return decodeSampledBitmapFromResource(ImageAdapter.this.mContext.getResources(), data, 100, 100);
        }

        // Once complete, see if ImageView is still around and set bitmap.
        @Override
        protected void onPostExecute(Bitmap bitmap) {
            if (imageViewReference != null && bitmap != null) {
                final ImageView imageView = imageViewReference.get();
                if (imageView != null) {
                    imageView.setImageBitmap(bitmap);
                    imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                    imageView.setLayoutParams(new GridView.LayoutParams(100, 70));
                }
            }
        }
    }

    public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
                                                         int reqWidth, int reqHeight) {

        // First decode with inJustDecodeBounds=true to check dimensions
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeResource(res, resId, options);

        // Calculate inSampleSize
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeResource(res, resId, options);
    }

    public static int calculateInSampleSize(
            BitmapFactory.Options options, int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            // Calculate ratios of height and width to requested height and width
            final int heightRatio = Math.round((float) height / (float) reqHeight);
            final int widthRatio = Math.round((float) width / (float) reqWidth);

            // Choose the smallest ratio as inSampleSize value, this will guarantee
            // a final image with both dimensions larger than or equal to the
            // requested height and width.
            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
        }

        return inSampleSize;
    }

}

以异步方式加载图像,并在加载的资源上添加一些额外的魔法。

这个解决方案对我来说运行正常,当你运行你的代码时,你实际上可以看到一次加载一个图像,从一个重量较轻且向上的图像开始,我猜,因为每个{{1}将有一个单独的工作人员ImageView,它将加载和转换资源,然后将其应用于Thread

证明:

asynctask load of resources in getview method inside custom adapter