Question

I am trying to implement Salesforce OAuth in Android Application.
I have used Salesforce Mobile SDK for implementing it. I have also added ‘SalesforceSDK-1.0.1.jar’ in my project.

MainActivity.java

package com.android.templateapp;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.salesforce.androidsdk.app.ForceApp;
import com.salesforce.androidsdk.rest.ClientManager;
import com.salesforce.androidsdk.rest.ClientManager.LoginOptions;
import com.salesforce.androidsdk.rest.ClientManager.RestClientCallback;
import com.salesforce.androidsdk.rest.RestClient;


public class MainActivity extends Activity {

private RestClient client;
private ArrayAdapter<String> listAdapter;
private static String TAG = "TemplateApp";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Log.v(TAG," onCreate of Main Activity");
    // Setup view
    setContentView(R.layout.main);
}

@Override 
public void onResume() {
    Log.v(TAG," ******* default onResume of Main Activity");
        super.onResume();

        findViewById(R.id.root).setVisibility(View.INVISIBLE);
        Log.v(TAG," ******* default onResume - View.INVISIBLE");

        // Login options
        String accountType = ForceApp.APP.getAccountType();

        Log.v(TAG," ******* default onResume - accountType ::"+accountType);

        LoginOptions loginOptions = new LoginOptions(
                "https://login.salesforce.com/", // login host is chosen by user through the server picker 
                ForceApp.APP.getPasscodeHash(),
                getString(R.string.oauth_callback_url),
                getString(R.string.oauth_client_id),
                new String[] {"api"});
        Log.v(TAG," ******* default onResume - loginOptions ::"+loginOptions);


        // Get a rest client
        new ClientManager(this, accountType, loginOptions).getRestClient(this, 
                       new RestClientCallback() {
            @Override
            public void authenticatedRestClient(RestClient client) {

                // Show everything
                findViewById(R.id.root).setVisibility(View.VISIBLE);

                //User is authenticated, insert Application logic here
            }
        });
    }


protected LoginOptions getLoginOptions() {
    Log.v(TAG," getLoginOptions of Main Activity");
    LoginOptions loginOptions = new LoginOptions(
            null, // login host is chosen by user through the server picker 
            ForceApp.APP.getPasscodeHash(),
            getString(R.string.oauth_callback_url),
            getString(R.string.oauth_client_id),
            new String[] {"api"});
    return loginOptions;
}

public void onResume(RestClient client) {
    Log.v(TAG," onResume of Main Activity");
    // Keeping reference to rest client
    this.client = client; 

    // Show everything
    findViewById(R.id.root).setVisibility(View.VISIBLE);
}

/**
 * Called when "Logout" button is clicked. 
 * 
 * @param v
 */
public void onLogoutClick(View v) {
    ForceApp.APP.logout(this);
}

/**
 * Called when "Clear" button is clicked. 
 * 
 * @param v
 */

public void onClearClick(View v) {
    listAdapter.clear();
}   

/**
 * Called when "Fetch Contacts" button is clicked
 * 
 * @param v
 * @throws UnsupportedEncodingException 
 */

public void onFetchContactsClick(View v) throws UnsupportedEncodingException {
    sendRequest("SELECT Name FROM Contact");
}

public void onFetchAccountsClick(View v) throws UnsupportedEncodingException {
    sendRequest("SELECT Name FROM Account");
}   

private void sendRequest(String soql) throws UnsupportedEncodingException {
    RestRequest restRequest = RestRequest.getRequestForQuery(getString(R.string.api_version), soql);

    client.sendAsync(restRequest, new AsyncRequestCallback() {
        @Override
        public void onSuccess(RestRequest request, RestResponse result) {
            try {
                listAdapter.clear();
                JSONArray records = result.asJSONObject().getJSONArray("records");
                for (int i = 0; i < records.length(); i++) {
                    listAdapter.add(records.getJSONObject(i).getString("Name"));
                }                   
            } catch (Exception e) {
                onError(e);
            }
        }

        @Override
        public void onError(Exception exception) {
            Toast.makeText(MainActivity.this,
                           MainActivity.this.getString(ForceApp.APP.getSalesforceR().stringGenericError(), exception.toString()),
                           Toast.LENGTH_LONG).show();
        }
    });
}

}

I am getting following errors in logcat:

12-18 17:47:04.696: E/Trace(1586): error opening trace file: No such file or directory (2)
12-18 17:47:05.256: V/TemplateApp(1586):  onCreate of Main Activity
12-18 17:47:05.526: V/TemplateApp(1586):  ******* default onResume of Main Activity
12-18 17:47:05.526: V/TemplateApp(1586):  ******* default onResume - View.INVISIBLE
12-18 17:47:05.536: D/AndroidRuntime(1586): Shutting down VM
12-18 17:47:05.536: W/dalvikvm(1586): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
12-18 17:47:05.546: E/AndroidRuntime(1586): FATAL EXCEPTION: main
12-18 17:47:05.546: E/AndroidRuntime(1586): java.lang.RuntimeException: Unable to resume activity {com.android.templateapp/com.android.templateapp.MainActivity}: java.lang.NullPointerException
12-18 17:47:05.546: E/AndroidRuntime(1586):     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2575)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2603)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2089)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at android.app.ActivityThread.access$600(ActivityThread.java:130)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at android.os.Looper.loop(Looper.java:137)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at android.app.ActivityThread.main(ActivityThread.java:4745)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at java.lang.reflect.Method.invokeNative(Native Method)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at java.lang.reflect.Method.invoke(Method.java:511)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at dalvik.system.NativeStart.main(Native Method)
12-18 17:47:05.546: E/AndroidRuntime(1586): Caused by: java.lang.NullPointerException
12-18 17:47:05.546: E/AndroidRuntime(1586):     at com.salesforce.androidsdk.app.ForceApp.getAccountType(ForceApp.java:175)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at com.android.templateapp.MainActivity.onResume(MainActivity.java:85)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1184)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at android.app.Activity.performResume(Activity.java:5082)
12-18 17:47:05.546: E/AndroidRuntime(1586):     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2565)
12-18 17:47:05.546: E/AndroidRuntime(1586):     ... 12 more

Answer 1

I’d imagine that you have not setup an application class that extends ForceApp and registered that in the AndroidManifest.xml file.