当我从一个 Activity (内部有 Viewager 和 ScrollView )转到另一个 Activity 时，应用程序崩溃了。我认为 ViewPager 工作正常，但回调系统并不完美。
在主代码中查看寻呼机
package com.sonalirod.run6;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class potovumi extends AppCompatActivity {
ViewPager viewPager;
ScreenshotsAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.potovumi);
viewPager =(ViewPager)findViewById(R.id.scr);
adapter =new ScreenshotsAdapter(this);
viewPager.setAdapter(adapter);
}
}
适配器代码
package com.sonalirod.run6;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
public class ScreenshotsAdapter extends PagerAdapter {
private int[] image_resources ={
R.drawable.pot1,
R.drawable.pot2,
R.drawable.pot3,
};
private Context ctx;
private LayoutInflater layoutInflater;
public ScreenshotsAdapter (Context ctx){
this.ctx=ctx;
}
@Override
public int getCount(){
return image_resources.length;
}
@Override
public Object instantiateItem(ViewGroup container,int position){
layoutInflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View item_view =layoutInflater.inflate(R.layout.screenshots,container,false);
ImageView imageView = (ImageView)item_view.findViewById(R.id.image_slider);
imageView.setImageResource(image_resources[position]);
container.addView(item_view);
return item_view;
}
@Override
public void destroyItem(ViewGroup container,int position,Object object)
{
container.removeView((LinearLayout)object);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return (view == object);
}
}
请帮忙
logcat
05-20 19:41:04.362 14317-14317/com.sonalirod.run6 D/dalvikvm: GC_FOR_ALLOC freed 8413K, 23% free 68639K/88288K, paused 18ms, total 18ms
05-20 19:41:04.362 14317-14317/com.sonalirod.run6 I/dalvikvm-heap: Forcing collection of SoftReferences for 28336144-byte allocation
05-20 19:41:04.392 14317-14317/com.sonalirod.run6 D/dalvikvm: GC_BEFORE_OOM freed 10K, 23% free 68628K/88288K, paused 30ms, total 30ms
05-20 19:41:04.392 14317-14317/com.sonalirod.run6 E/dalvikvm-heap: Out of memory on a 28336144-byte allocation.
05-20 19:41:04.392 14317-14317/com.sonalirod.run6 I/dalvikvm: "main" prio=5 tid=1 RUNNABLE
05-20 19:41:04.392 14317-14317/com.sonalirod.run6 I/dalvikvm: | group="main" sCount=0 dsCount=0 obj=0x41566cc0 self=0x4147d720
05-20 19:41:04.392 14317-14317/com.sonalirod.run6 I/dalvikvm: | sysTid=14317 nice=0 sched=0/0 cgrp=apps handle=1073840468
05-20 19:41:04.392 14317-14317/com.sonalirod.run6 I/dalvikvm: | state=R schedstat=( 0 0 0 ) utm=1385 stm=109 core=3
05-20 19:41:04.392 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:629)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:456)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:840)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.content.res.Resources.loadDrawable(Resources.java:2268)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at com.huawei.android.content.res.ResourcesEx.loadDrawable(ResourcesEx.java:632)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.content.res.Resources.getDrawable(Resources.java:750)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v7.widget.ResourcesWrapper.getDrawable(ResourcesWrapper.java:128)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v7.widget.TintResources.getDrawable(TintResources.java:45)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v4.content.ContextCompat.getDrawable(ContextCompat.java:374)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:202)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:190)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v7.content.res.AppCompatResources.getDrawable(AppCompatResources.java:100)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v7.widget.AppCompatImageHelper.setImageResource(AppCompatImageHelper.java:73)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v7.widget.AppCompatImageView.setImageResource(AppCompatImageView.java:81)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at com.sonalirod.run6.ScreenshotsAdapter.instantiateItem(ScreenshotsAdapter.java:41)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1034)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v4.view.ViewPager.populate(ViewPager.java:1248)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v4.view.ViewPager.populate(ViewPager.java:1116)
05-20 19:41:04.402 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.support.v4.view.ViewPager$3.run(ViewPager.java:273)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.view.Choreographer.doCallbacks(Choreographer.java:574)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.view.Choreographer.doFrame(Choreographer.java:543)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.os.Handler.handleCallback(Handler.java:733)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.os.Handler.dispatchMessage(Handler.java:95)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.os.Looper.loop(Looper.java:136)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at android.app.ActivityThread.main(ActivityThread.java:5421)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at java.lang.reflect.Method.invokeNative(Native Method)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at java.lang.reflect.Method.invoke(Method.java:515)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:979)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 I/dalvikvm: at dalvik.system.NativeStart.main(Native Method)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 D/skia: --- allocation failed for scaled bitmap
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 D/AndroidRuntime: Shutting down VM
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x41565bc0)
05-20 19:41:04.412 14317-14317/com.sonalirod.run6 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.sonalirod.run6, PID: 14317
java.lang.OutOfMemoryError
at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:629)
at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:456)
at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:840)
at android.content.res.Resources.loadDrawable(Resources.java:2268)
at com.huawei.android.content.res.ResourcesEx.loadDrawable(ResourcesEx.java:632)
at android.content.res.Resources.getDrawable(Resources.java:750)
at android.support.v7.widget.ResourcesWrapper.getDrawable(ResourcesWrapper.java:128)
at android.support.v7.widget.TintResources.getDrawable(TintResources.java:45)
at android.support.v4.content.ContextCompat.getDrawable(ContextCompat.java:374)
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:202)
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:190)
at android.support.v7.content.res.AppCompatResources.getDrawable(AppCompatResources.java:100)
at android.support.v7.widget.AppCompatImageHelper.setImageResource(AppCompatImageHelper.java:73)
at android.support.v7.widget.AppCompatImageView.setImageResource(AppCompatImageView.java:81)
at com.sonalirod.run6.ScreenshotsAdapter.instantiateItem(ScreenshotsAdapter.java:41)
at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1034)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1248)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1116)
at android.support.v4.view.ViewPager$3.run(ViewPager.java:273)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:543)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5421)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:979)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795)
at dalvik.system.NativeStart.main(Native Method)
05-20 19:41:04.422 14317-14317/com.sonalirod.run6 E/AndroidRuntime: There is a OOM!
最佳答案
ScreenshotsAdapter#instantiateItem 中的 imageView.setImageResource(image_resources[position]) 行导致 OutOfMemoryException 要么是您的图像太大，要么您执行此操作的频率更高。
public static int calculateInSampleSizeUsingPower2(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) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) > reqHeight
&& (halfWidth / inSampleSize) > reqWidth)
inSampleSize *= 2;
}
return inSampleSize;
}
public static Bitmap decodeSampledBitmapFromResource(Resources res,
int resId, int reqWidth, int reqHeight) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res, resId, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSizeUsingPower2(options, reqWidth, reqHeight);
options.inJustDecodeBounds = false;
return BitmapFactory.decodeResource(res, resId, options);
}
将此行 imageView.setImageResource(image_resources[position]) 替换为
int reqHeight = 500; // we will use this or similer to this value to prevent OOM.
int reqWidth = 500; // we will use this or similer to this value to prevent OOM.
imageView.setImageBitmap(decodeSampledBitmapFromResource(getResources(), image_resources[position], reqWidth, reqWidth));
或者使用任何图像加载库，例如 Picasso
Picasso.with(context).load(image_resources[position]).placeholder(YOUR_PLACE_HOLDER_OR_LEAVE_EMPTY).into(imageView);
关于java - ViewPager 在运行后按下新 Activity 时崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44085435/