Android之OOM异常解决案例讲解 Android之OOM异常解决案例讲解

02-03 08:56:12.411: E/AndroidRuntime(10137): FATAL EXCEPTION: main02-03 08:56:12.411: E/AndroidRuntime(10137): java.lang.IllegalStateException: Could not execute method of the activity02-03 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.InvocationTargetException02-03 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 more02-03 08:56:12.411: E/AndroidRuntime(10137): Caused by: java.lang.OutOfMemoryError02-03 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
【Android之OOM异常解决案例讲解】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; @Overrideprotected 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：

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