问题描述
|
当Java进程用完堆时,sun JVM支持ѭ0选项来转储堆。
Android上是否有类似的选项,可以在OutOfMemoryException上生成android应用程序转储堆?手动使用DDMS时,可能很难尝试正确计时。
解决方法
扩展CommonsWare的答案:
我不知道这是否可行,但是您可以尝试添加顶级异常处理程序,并在其中请求堆转储(如果它是1)。
我在自己的Android应用中使用以下代码成功遵循了他的建议:
public class MyActivity extends Activity {
public static class MyUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
@Override
public void uncaughtException(Thread thread,Throwable ex) {
Log.e(\"UncaughtException\",\"Got an uncaught exception: \"+ex.toString());
if(ex.getClass().equals(OutOfMemoryError.class))
{
try {
android.os.Debug.dumpHprofData(\"/sdcard/dump.hprof\");
} catch (IOException e) {
e.printStackTrace();
}
}
ex.printStackTrace();
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Thread.currentThread().setUncaughtExceptionHandler(new MyUncaughtExceptionHandler());
}
}
创建转储后,您需要将其从手机复制到PC:单击手机上的“打开USB存储设备”,找到文件并将其复制到硬盘驱动器。
然后,如果要使用Eclipse Memory Analyzer(MAT)分析文件,则需要隐藏文件:hprof-conv.exe dump.hprof dump-conv.hprof
(hprof-conv位于android-sdk/tools
下)
最后,用MAT打开dump-conv.hprof
文件
,我不知道这是否可行,但是您可以尝试添加顶级异常处理程序,并在其中请求堆转储(如果它是1)。
,这是一个改进的版本。除了原始实现之外,该实现还支持:
在所有线程上(不仅在主线程上)捕获内存不足错误
识别出内存不足错误,即使它隐藏在另一个错误中。在某些情况下,内存不足错误会封装在运行时错误中。
也调用原始的默认未捕获异常处理程序。
仅适用于DEBUG版本。
用法:在onCreate方法中的Application类中调用静态initialize
方法。
package test;
import java.io.File;
import java.io.IOException;
import java.lang.Thread.UncaughtExceptionHandler;
import android.os.Environment;
import android.util.Log;
import com.example.test1.BuildConfig;
public class OutOfMemoryDumper implements Thread.UncaughtExceptionHandler {
private static final String TAG = \"OutOfMemoryDumper\";
private static final String FILE_PREFIX = \"OOM-\";
private static final OutOfMemoryDumper instance = new OutOfMemoryDumper();
private UncaughtExceptionHandler oldHandler;
/**
* Call this method to initialize the OutOfMemoryDumper when your
* application is first launched.
*/
public static void initialize() {
// Only works in DEBUG builds
if (BuildConfig.DEBUG) {
instance.setup();
}
}
/**
* Keep the constructor private to ensure we only have one instance
*/
private OutOfMemoryDumper() {
}
private void setup() {
// Checking if the dumper isn\'t already the default handler
if (!(Thread.getDefaultUncaughtExceptionHandler() instanceof OutOfMemoryDumper)) {
// Keep the old default handler as we are going to use it later
oldHandler = Thread.getDefaultUncaughtExceptionHandler();
// Redirect uncaught exceptions to this class
Thread.setDefaultUncaughtExceptionHandler(this);
}
Log.v(TAG,\"OutOfMemoryDumper is ready\");
}
@Override
public void uncaughtException(Thread thread,Throwable ex) {
Log.e(TAG,\"Uncaught exception: \" + ex);
Log.e(TAG,\"Caused by: \" + ex.getCause());
// Checking if the exception or the original cause for the exception is
// an out of memory error
if (ex.getClass().equals(OutOfMemoryError.class)
|| (ex.getCause() != null && ex.getCause().getClass()
.equals(OutOfMemoryError.class))) {
// Checking if the external storage is mounted and available
if (isExternalStorageWritable()) {
try {
// Building the path to the new file
File f = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
long time = System.currentTimeMillis();
String dumpPath = f.getAbsolutePath() + \"/\" + FILE_PREFIX
+ time + \".hprof\";
Log.i(TAG,\"Dumping hprof data to: \" + dumpPath);
android.os.Debug.dumpHprofData(dumpPath);
} catch (IOException ioException) {
Log.e(TAG,\"Failed to dump hprof data. \" + ioException.toString());
ioException.printStackTrace();
}
}
}
// Invoking the original default exception handler (if exists)
if (oldHandler != null) {
Log.v(TAG,\"Invoking the original uncaught exception handler\");
oldHandler.uncaughtException(thread,ex);
}
}
/**
* Checks if external storage is available for read and write
*
* @return true if the external storage is available
*/
private boolean isExternalStorageWritable() {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
return true;
}
Log.w(TAG,\"The external storage isn\'t available. hprof data won\'t be dumped! (state=\" + state + \")\");
return false;
}
}