Android之OOM异常解决案例讲解
作者:悬弧
这篇文章主要介绍了Android之OOM异常解决案例讲解,本篇文章通过简要的案例,讲解了该项技术的了解与使用,以下就是详细内容,需要的朋友可以参考下
02-03 08:56:12.411: E/AndroidRuntime(10137): FATAL EXCEPTION: main 02-03 08:56:12.411: E/AndroidRuntime(10137): java.lang.IllegalStateException: Could not execute method of the activity 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.view.View$1.onClick(View.java:3591) 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.view.View.performClick(View.java:4084) 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.view.View$PerformClick.run(View.java:16966) 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.os.Handler.handleCallback(Handler.java:615) 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.os.Handler.dispatchMessage(Handler.java:92) 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.os.Looper.loop(Looper.java:137) 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.app.ActivityThread.main(ActivityThread.java:4745) 02-03 08:56:12.411: E/AndroidRuntime(10137): at java.lang.reflect.Method.invokeNative(Native Method) 02-03 08:56:12.411: E/AndroidRuntime(10137): at java.lang.reflect.Method.invoke(Method.java:511) 02-03 08:56:12.411: E/AndroidRuntime(10137): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 02-03 08:56:12.411: E/AndroidRuntime(10137): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 02-03 08:56:12.411: E/AndroidRuntime(10137): at dalvik.system.NativeStart.main(Native Method) 02-03 08:56:12.411: E/AndroidRuntime(10137): Caused by: java.lang.reflect.InvocationTargetException 02-03 08:56:12.411: E/AndroidRuntime(10137): at java.lang.reflect.Method.invokeNative(Native Method) 02-03 08:56:12.411: E/AndroidRuntime(10137): at java.lang.reflect.Method.invoke(Method.java:511) 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.view.View$1.onClick(View.java:3586) 02-03 08:56:12.411: E/AndroidRuntime(10137): ... 11 more 02-03 08:56:12.411: E/AndroidRuntime(10137): Caused by: java.lang.OutOfMemoryError 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method) 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:527) 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:301) 02-03 08:56:12.411: E/AndroidRuntime(10137): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:326) 02-03 08:56:12.411: E/AndroidRuntime(10137): at com.ithema.bitmap.MainActivity.down(MainActivity.java:52) 02-03 08:56:12.411: E/AndroidRuntime(10137): ... 14 more
堆内存空间主要是给类实例、数组分配空间。当图片占用的空间大于对内存空间时就会抛出内存溢出的异常。
本示例是在加载15M左右的图片而引起的OOM异常,默认情况下,虚拟机只语序允许加载10M以内大小的图片。如果超过10M,则会抛出OOM异常
问题解决思路:缩放加载图片
1、得到设备屏幕的分辨率:
2、得到原图的分辨率:
3、通过比较得到一个合适的比例值:
4、使用比例值缩放一张图片,并加载到内存中:
示例代码:
package com.ithema.bitmap; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.BitmapFactory.Options; import android.graphics.Point; import android.os.Bundle; import android.os.Environment; import android.view.Display; import android.view.View; import android.view.WindowManager; import android.widget.ImageView; public class MainActivity extends Activity { private ImageView iv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); iv = (ImageView) findViewById(R.id.iv); } public void down(View view) { //1.获取手机屏幕分辨率的大小 WindowManager wm=(WindowManager) getSystemService(WINDOW_SERVICE); Display display = wm.getDefaultDisplay(); int screenHeight = display.getHeight(); int screenWidth = display.getWidth(); //2.获取原图分辨率的大小 Options opts=new Options(); opts.inJustDecodeBounds=true; BitmapFactory.decodeFile(Environment.getExternalStorageDirectory()+"/1.bmp", opts); int outHeight = opts.outHeight; int outWidth = opts.outWidth; //3.得到缩放比 int scale=1; int scaleX=outWidth/screenWidth; int scaleY=outHeight/screenHeight; if(scaleX>scaleY&&scaleX>1){ scale=scaleX; } if(scaleY>scaleX&&scaleY>1){ scale=scaleY; } //4.使用比例值缩放一张图片,并加载到内存中: opts.inJustDecodeBounds=false; opts.inSampleSize=scale; Bitmap bitmap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory()+"/1.bmp", opts); iv.setImageBitmap(bitmap); } }
布局文件代码:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:onClick="down" android:text="加载大图片" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <ImageView android:id="@+id/iv" android:layout_width="fill_parent" android:layout_height="fill_parent" /> </LinearLayout>
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