What's wrong with my code? Dropbox SYNC Api + Android Studio

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Mobile

Android

DropBox

i am trying to build an app that Syncs with apps from Dropbox Sync API. I have carefully implemented the steps for configuring the Dropbox SYNC API. But i still cannot make the code to function.

package ************;

import java.io.IOException; import java.util.List;

import android.accounts.Account;
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import android.widget.TextView;
import android.os.Handler.Callback;
import com.dropbox.sync.android.DbxAccountManager;
import com.dropbox.sync.android.DbxException;
import com.dropbox.sync.android.DbxFile;
import com.dropbox.sync.android.DbxFileSystem;
import com.dropbox.sync.android.DbxFileInfo;

import com.dropbox.sync.android.DbxPath;

public class LogInActivity extends ActionBarActivity {

private static final String appKey = ""; private static final String appSecret = ""; private static final int REQUEST_LINK_TO_DBX = 0; private Button mLinkButton;

private TextView txtviewres;



private DbxAccountManager mDbxAcctMgr;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_log_in);
mDbxAcctMgr = DbxAccountManager.getInstance(getApplicationContext(),appKey,appSecret);
txtviewres = (TextView) findViewById(R.id.textView5);

mLinkButton = (Button) findViewById(R.id.button1);
mLinkButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v)
{

onClickLinkToDropbox();

}
});
}

@Override
protected void onResume() {
super.onResume();
if (mDbxAcctMgr.hasLinkedAccount()) {
tesfunk();

} else {
txtviewres.setText("Link to Dropbox failed or was cancelled.");
}
}

private void onClickLinkToDropbox() {
mDbxAcctMgr.startLink((Activity)this, REQUEST_LINK_TO_DBX);
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_LINK_TO_DBX) {
if (resultCode == Activity.RESULT_OK) {
tesfunk();
} else {
txtviewres.setText("Link to Dropbox failed or was cancelled.");
}
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}
private void tesfunk(){ try {

DbxFileSystem dbxFs = DbxFileSystem.forAccount(mDbxAcctMgr.getLinkedAccount());


DbxFile testFile = dbxFs.create(new DbxPath("hello.txt"));
try {
testFile.writeString("Hello Dropbox!");
} finally {
testFile.close();
}



}
catch(IOException e)
{

}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_log_in, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}

return super.onOptionsItemSelected(item);
}
}