tree df39dcd82c5161ba2fa6dc5c4f747b602755e496
parent 90329a69f8e26626c3dc51c50a287e47931afe18
author Evan JIANG <firstfan@gmail.com> 1225127618 +0800
committer Jean-Baptiste Queru <jbq@google.com> 1236197047 -0800

Fix a FileObserver jni bug.
The path string in FileObserver jni will not be automatically released
in the while loop. Then it will cause too many local refs in the ref
table. When received too many file changed notifications/events, the
process will be killed for "Failed adding to JNI local ref table".
Test code:
=============================================================
import android.app.Activity;
import android.os.Bundle;
import android.os.FileObserver;
import android.util.Log;

import java.io.File;
import java.io.IOException;

public class TestApp extends Activity {

    public static final String TAG="TestApp";
    FileObserver observer;

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);

        observer=new FileObserver("/tmp"){
            @Override
            public void onEvent(int event, String path) {
                if(event == FileObserver.CREATE){
                    Log.e(TAG, "File created [" + path + "]");
                }else if(event == FileObserver.DELETE){
                    Log.e(TAG, "File deleted [" + path + "]");
                }
            }
        };
        observer.startWatching();

        File f=new File("/tmp/a.txt");
        for (int i=0;i<300;i++) {
            try {
                f.createNewFile();
            } catch (IOException e) {
            }
            f.delete();
        }
    }

}
================================================
The last 2 lines of the log:
E/dalvikvm(  705): Failed adding to JNI local ref table (has 512
entries)
E/dalvikvm(  705): VM aborting