Android之OOM异常 Android之OOM异常解决案例讲解
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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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