问题
i'm trying to make a wallpaper set app using ImageView. I know its hard to display a bunch of images (especially when images are 1920x1080), what i did was to make other bunch of images with a smaller resolution (400x200) that would be displayed in the app, but when user is trying to set a image as wallpaper it gets the same image but with the bigger resolution. I thought this will solve my problem, but it didn't, the app runs more time then before, but at a moment it fails. I noticed that the app fails after i set 3 images as wallpaper. I try'd to use garbage collector, it doesn't 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 the 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)
回答1:
Move the images to a new folder called "drawable-nodpi".
Reason
Images in different drawable folders are opened by the android system with different memory allocations, hdpi means it will take a LOT of memory even if the image is tiny.
drawable-nodpi is the best for memory saving.
回答2:
To fix OutOfMemory you should do something like that:
BitmapFactory.Options options=new BitmapFactory.Options();
options.inSampleSize = 8;
Bitmap preview_bitmap=BitmapFactory.decodeStream(is,null,options);
This inSampleSize option reduces memory consumption.
Here's a complete method. First it reads image size without decoding the content itself. Then it finds the best inSampleSize value, it should be 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;
}
来源：https://stackoverflow.com/questions/20817369/outofmemory-error-using-imageview