Clear cache of other applications in android not duplicate

Question

Hi I'm trying to clean other applications cache from my application, I'm able to clear other apps cache now till 4.1.2 version of android using the following code

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import android.app.Activity;
import android.content.pm.IPackageDataObserver;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.TextView;

public class CacheNukerActivity extends Activity {
private static final long ALL_YOUR_CACHE_ARE_BELONG_TO_US=1000000000L;
private CachePackageDataObserver mClearCacheObserver;
private TextView tv=null;

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

tv=(TextView)findViewById(R.id.status);
tv.setText("Clearing cache...");

clearCache();
}

 private final void clearCache() {
if (mClearCacheObserver == null) {
  mClearCacheObserver=new CachePackageDataObserver();
}

PackageManager mPM=getPackageManager();

@SuppressWarnings("rawtypes")
final Class[] classes= { Long.TYPE, IPackageDataObserver.class };

Long localLong=Long.valueOf(ALL_YOUR_CACHE_ARE_BELONG_TO_US);
try {
  Method localMethod=
      mPM.getClass().getMethod("freeStorageAndNotify", classes);

  try {
    localMethod.invoke(mPM, localLong, mClearCacheObserver);
  }
  catch (IllegalArgumentException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
  catch (IllegalAccessException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
  catch (InvocationTargetException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
}
catch (NoSuchMethodException e1) {
  // TODO Auto-generated catch block
  e1.printStackTrace();
}
}

private class CachePackageDataObserver extends
  IPackageDataObserver.Stub {
public void onRemoveCompleted(String packageName, boolean succeeded) {
  tv.post(new Runnable() {
    public void run() {
      tv.append(" cache cleared");
    }
  });
}
}
}

and the IPackageDataObserver code is

package android.content.pm;

oneway interface IPackageDataObserver {
    void onRemoveCompleted(in String packageName, boolean succeeded);
}

But when I run the same application in 4.2 and above android version, cache is not clearing. Please someone help me.

Answer 1

I've found the solution guys, the working code snippet is as follows, just change the ALL_YOUR_CACHE_ARE_BELONG_TO_US long value from 1000000000L to Long.MAX_VALUE

public class CacheNukerActivity extends Activity {
    private static final long ALL_YOUR_CACHE_ARE_BELONG_TO_US=Long.MAX_VALUE;
    private CachePackageDataObserver mClearCacheObserver;
    private TextView tv=null;

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

        tv=(TextView)findViewById(R.id.status);
        tv.setText("Clearing cache...");

        clearCache();
    }

         private final void clearCache() {
        if (mClearCacheObserver == null) {
          mClearCacheObserver=new CachePackageDataObserver();
        }

        PackageManager mPM=getPackageManager();

        @SuppressWarnings("rawtypes")
        final Class[] classes= { Long.TYPE, IPackageDataObserver.class };

        Long localLong=Long.valueOf(ALL_YOUR_CACHE_ARE_BELONG_TO_US);
        try {
          Method localMethod=
              mPM.getClass().getMethod("freeStorageAndNotify", classes);

          try {
            localMethod.invoke(mPM, localLong, mClearCacheObserver);
          }
          catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          }
          catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          }
          catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          }
        }
        catch (NoSuchMethodException e1) {
          // TODO Auto-generated catch block
          e1.printStackTrace();
        }
        }

        private class CachePackageDataObserver extends
          IPackageDataObserver.Stub {
        public void onRemoveCompleted(String packageName, boolean succeeded) {

            }
          });
        }
        }
        }