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java-在GridView组件中显示多个图像时,Android应用程序崩溃

2019-11-23 04:13:39  阅读：228  来源： 互联网

标签：android-gridview memory-leaks java android


我是这个网站的新手,我在这里是因为我在其他任何地方都找不到此答案,所以我想看看能否获得帮助！

我的项目中有一个GridView以及一个图像适配器.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): FATAL EXCEPTION: main 06-28
17:51:14.104: E/AndroidRuntime(818):
java.lang.OutOfMemoryError 06-28 17:51:14.104: E/AndroidRuntime(818):
at
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(Native Method)

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);
        }
    });
}
}

从上面可以看到,我已注释掉对我不起作用的内容.我不知道这是否是因为此GridView的图片太多,但是很烦人.一旦我注释掉这些图像,程序就可以正常运行,但是如果我删除/ *并运行该程序并选择Gallery,它将仅显示黑屏.不久之后它将崩溃.

请通过我不断搜索的这段代码来帮助我,但找不到任何帮助.

解决方法:

您的问题是由于分配可绘制资源时堆大小已用尽(这是一个常见问题,因为这种操作需要大量内存).

当我尝试过您的代码时,出现java.lang.OutOfMemoryError：位图大小超出VM预算.这是一个简单明了的错误信息.

然后,我进行了一些研究,并在Android Dev官方网站上遇到了“本地”线程：http://developer.android.com/training/displaying-bitmaps/index.html有关位图以及有关如何在应用程序中进行有效资源分配的示例.

所以我尝试了一下,并与您的代码结合在一起,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;
    }

}

异步加载图像并对加载的资源执行其他操作.

此解决方案对我来说效果很好,并且在您运行代码时,您实际上可以一次看到加载的图像,从重量较小的图像开始,然后向上加载,因为每个ImageView都会有单独的工作程序线程,它将加载和转换资源,然后将其应用于ImageView.

证明：

标签：android-gridview,memory-leaks,java,android
来源： https://codeday.me/bug/20191123/2065025.html

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