使用ImageView时OutOfMemory错误

时间：2013-12-28 17:33:46

标签： android out-of-memory

我正在尝试使用ImageView制作壁纸设置应用。我知道很难显示一堆图像（特别是当图像是1920x1080时），我所做的是制作一组较小分辨率（400x200）的图像，这些图像会在应用程序中显示，但是当用户试图设置时作为壁纸的图像，它获得相同的图像，但具有更大的分辨率。 我认为这将解决我的问题，但事实并非如此，应用程序运行的时间比以前更多，但此刻它失败了。我注意到我将3张图片设置为壁纸后应用程序失败了。我尝试使用垃圾收集器，它不起作用。有什么想法吗？

这是我的代码。

package app.technozed.winterwallpapers;

import java.io.IOException;
import android.os.Bundle;
import android.app.Activity;
import android.app.WallpaperManager;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

ImageView display;
int toPhone;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    toPhone = R.drawable.wal1;

    display = (ImageView) findViewById(R.id.WPdisplay);
    ImageView image1 = (ImageView) findViewById(R.id.WPimg1);
    ImageView image2 = (ImageView) findViewById(R.id.WPimg2);
    ImageView image3 = (ImageView) findViewById(R.id.WPimg3);
    ImageView image4 = (ImageView) findViewById(R.id.WPimg4);
    ImageView image5 = (ImageView) findViewById(R.id.WPimg5);
    ImageView image6 = (ImageView) findViewById(R.id.WPimg6);
    ImageView image7 = (ImageView) findViewById(R.id.WPimg7);
    ImageView image8 = (ImageView) findViewById(R.id.WPimg8);
    ImageView image9 = (ImageView) findViewById(R.id.WPimg9);
    ImageView image10 = (ImageView) findViewById(R.id.WPimg10);
    ImageView image11 = (ImageView) findViewById(R.id.WPimg11);
    ImageView image12 = (ImageView) findViewById(R.id.WPimg12);
    ImageView image13 = (ImageView) findViewById(R.id.WPimg13);
    ImageView image14 = (ImageView) findViewById(R.id.WPimg14);
    ImageView image15 = (ImageView) findViewById(R.id.WPimg15);
    ImageView image16 = (ImageView) findViewById(R.id.WPimg16);
    ImageView image17 = (ImageView) findViewById(R.id.WPimg17);
    ImageView image18 = (ImageView) findViewById(R.id.WPimg18);
    ImageView image19 = (ImageView) findViewById(R.id.WPimg19);
    ImageView image20 = (ImageView) findViewById(R.id.WPimg20);
    ImageView image21 = (ImageView) findViewById(R.id.WPimg21);
    ImageView image22 = (ImageView) findViewById(R.id.WPimg22);
    ImageView image23 = (ImageView) findViewById(R.id.WPimg23);
    ImageView image24 = (ImageView) findViewById(R.id.WPimg24);
    ImageView image25 = (ImageView) findViewById(R.id.WPimg25);
    ImageView image26 = (ImageView) findViewById(R.id.WPimg26);
    ImageView image27 = (ImageView) findViewById(R.id.WPimg27);
    ImageView image28 = (ImageView) findViewById(R.id.WPimg28);
    ImageView image29 = (ImageView) findViewById(R.id.WPimg29);
    ImageView image30 = (ImageView) findViewById(R.id.WPimg30);
    Button setWall = (Button) findViewById(R.id.BsetWall);
    image1.setOnClickListener(this);
    image2.setOnClickListener(this);
    image3.setOnClickListener(this);
    image4.setOnClickListener(this);
    image5.setOnClickListener(this);
    image6.setOnClickListener(this);
    image7.setOnClickListener(this);
    image8.setOnClickListener(this);
    image9.setOnClickListener(this);
    image10.setOnClickListener(this);
    image11.setOnClickListener(this);
    image12.setOnClickListener(this);
    image13.setOnClickListener(this);
    image14.setOnClickListener(this);
    image15.setOnClickListener(this);
    image16.setOnClickListener(this);
    image17.setOnClickListener(this);
    image18.setOnClickListener(this);
    image19.setOnClickListener(this);
    image20.setOnClickListener(this);
    image21.setOnClickListener(this);
    image22.setOnClickListener(this);
    image23.setOnClickListener(this);
    image24.setOnClickListener(this);
    image25.setOnClickListener(this);
    image26.setOnClickListener(this);
    image27.setOnClickListener(this);
    image28.setOnClickListener(this);
    image29.setOnClickListener(this);
    image30.setOnClickListener(this);
    setWall.setOnClickListener(this);
    }

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}


@Override
public void onClick(View v) {
    switch (v.getId()){
    case R.id.WPimg1:
         display.setImageResource(R.drawable.wal1);
         toPhone = R.drawable.wal1;
         break;
    case R.id.WPimg2:
         display.setImageResource(R.drawable.wal2);
         toPhone = R.drawable.wal2;
         break;
    case R.id.WPimg3:
         display.setImageResource(R.drawable.wal3);
         toPhone = R.drawable.wal3;
         break;
    case R.id.WPimg4:
         display.setImageResource(R.drawable.wal4);
         toPhone = R.drawable.wal4;
         break;
    case R.id.WPimg5:
         display.setImageResource(R.drawable.wal5);
         toPhone = R.drawable.wal5;
         break;
    case R.id.WPimg6:
         display.setImageResource(R.drawable.wal6);
         toPhone = R.drawable.wal6;
         break;
    case R.id.WPimg7:
         display.setImageResource(R.drawable.wal7);
         toPhone = R.drawable.wal7;
         break;
    case R.id.WPimg8:
         display.setImageResource(R.drawable.wal8);
         toPhone = R.drawable.wal8;
         break;
    case R.id.WPimg9:
         display.setImageResource(R.drawable.wal9);
         toPhone = R.drawable.wal9;;
         break;
    case R.id.WPimg10:
         display.setImageResource(R.drawable.wal10);
         toPhone = R.drawable.wal10;
         break;
    case R.id.WPimg11:
         display.setImageResource(R.drawable.wal11);
         toPhone = R.drawable.wal11;
         break;
    case R.id.WPimg12:
         display.setImageResource(R.drawable.wal12);
         toPhone = R.drawable.wal12;
         break;
    case R.id.WPimg13:
         display.setImageResource(R.drawable.wal13);
         toPhone = R.drawable.wal13;
         break;
    case R.id.WPimg14:
         display.setImageResource(R.drawable.wal14);
         toPhone = R.drawable.wal14;
         break;
    case R.id.WPimg15:
         display.setImageResource(R.drawable.wal15);
         toPhone = R.drawable.wal15;
         break;
    case R.id.WPimg16:
         display.setImageResource(R.drawable.wal16);
         toPhone = R.drawable.wal16;
         break;
    case R.id.WPimg17:
         display.setImageResource(R.drawable.wal17);
         toPhone = R.drawable.wal17;
         break;
    case R.id.WPimg18:
         display.setImageResource(R.drawable.wal18);
         toPhone = R.drawable.wal18;
         break;
    case R.id.WPimg19:
         display.setImageResource(R.drawable.wal19);
         toPhone = R.drawable.wal19;
         break;
    case R.id.WPimg20:
         display.setImageResource(R.drawable.wal20);
         toPhone = R.drawable.wal20;
         break;
    case R.id.WPimg21:
         display.setImageResource(R.drawable.wal21);
         toPhone = R.drawable.wal21;
         break;
    case R.id.WPimg22:
         display.setImageResource(R.drawable.wal22);
         toPhone = R.drawable.wal22;
         break;
    case R.id.WPimg23:
         display.setImageResource(R.drawable.wal23);
         toPhone = R.drawable.wal23;
         break;
    case R.id.WPimg24:
         display.setImageResource(R.drawable.wal24);
         toPhone = R.drawable.wal24;
         break;
    case R.id.WPimg25:
         display.setImageResource(R.drawable.wal25);
         toPhone = R.drawable.wal25;
         break;
    case R.id.WPimg26:
         display.setImageResource(R.drawable.wal26);
         toPhone = R.drawable.wal26;
         break;
    case R.id.WPimg27:
         display.setImageResource(R.drawable.wal27);
         toPhone = R.drawable.wal27;
         break;
    case R.id.WPimg28:
         display.setImageResource(R.drawable.wal28);
         toPhone = R.drawable.wal28;
         break;
    case R.id.WPimg29:
         display.setImageResource(R.drawable.wal29);
         toPhone = R.drawable.wal29;
         break;
    case R.id.WPimg30:
         display.setImageResource(R.drawable.wal30);
         toPhone = R.drawable.wal30;
         break;
    case R.id.BsetWall:
         try{
                  WallpaperManager.getInstance(getApplicationContext()).setResource(toPhone);
             Toast.makeText(getApplicationContext(), "Wallpaper was set!", Toast.LENGTH_SHORT).show();
         } catch(IOException e) {
             e.printStackTrace();
             Toast.makeText(getApplicationContext(), "No privileges!", Toast.LENGTH_SHORT).show();
         }
         break;
    }

    }

    }

这是LogCat。

--- allocation failed for scaled bitmap
Shutting down VM
threadid=1: thread exiting with uncaught exception (group=0x41618ba8)
FATAL EXCEPTION: main
Process: app.technozed.winterwallpapers, PID: 2574
java.lang.OutOfMemoryError
at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:587)
at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:422)
at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:840)
at android.content.res.Resources.loadDrawable(Resources.java:2110)
at android.content.res.Resources.getDrawable(Resources.java:700)
at android.widget.ImageView.resolveUri(ImageView.java:638)
at android.widget.ImageView.setImageResource(ImageView.java:367)
at app.technozed.winterwallpapers.MainActivity.onClick(MainActivity.java:143)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)

2 个答案:

答案 0 :(得分：8)

将图像移动到名为＆＃34; drawable-nodpi＆＃34;的新文件夹。

<强>原因

不同的可绘制文件夹中的图像由android系统打开，具有不同的内存分配，hdpi意味着即使图像很小，也会占用大量内存。

drawable-nodpi是节省内存的最佳选择。

答案 1 :(得分：2)

要修复OutOfMemory，你应该做类似的事情：

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

此inSampleSize选项可减少内存消耗。

这是一个完整的方法。首先，它读取图像大小而不解码内容本身。然后它找到最好的inSampleSize值，它应该是2的幂。最后图像被解码。

//decodes image and scales it to reduce memory consumption
private 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;
}
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