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>到此这篇关于Android之OOM异常解决案例讲解的文章就介绍到这了,更多相关Android之OOM异常内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
