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OutOfMemory error using ImageView

I am trying to create a wallpaper application using ImageView. I know that it is difficult to display a bunch of images (especially when the images are 1920x1080), I did to make another group of images with a lower resolution (400x200) that will be displayed in the application, but when the user tries to set the image as wallpaper, he gets one and the same same image, but with higher resolution. I thought that this would solve my problem, but this did not happen, the application starts longer than before, but in one instant it fails. I noticed that the application fails after I set 3 images as wallpaper. I try to use the garbage collector, it does not work. Any ideas?

Here is my code.

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; } } }

And here is 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)
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2 answers

Move the images to a new folder called "drawable-nodpi".

Cause

Images in different accessible folders are opened by the android system with different memory allocations, hdpi means that it will take a lot of memory, even if the image is tiny.

drawable-nodpi is best for saving memory.

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To fix OutOfMemory, you should do something like this:

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

This inSampleSize parameter reduces memory consumption.

Here is the full method. First, it reads the image size without decoding the content itself. Then it finds the best value inSampleSize, it should have a power of 2. And finally, the image is decoded.

 //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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Source: https://habr.com/ru/post/1271303/

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