Android – How to call an activity in another project

androidandroid-activity

Hi I am new to android and I have created 2 projects.

Now I want to call an activity in the second project from the first project upon a button click.

The 1st project only handles login screen and when I click on the login button I need to call an activity which is present in the second project.

I searched the net but didn't find any tutorials which I understood properly.

Hi I found the following error.

01-30 08:36:47.230: E/dalvikvm(3408): Could not find class 'com.androidhive.googleplacesandmaps.MainActivity', referenced from method org.fluturasymphony.recommendation.LoginActivity$DownloadWebPageTask.doInBackground
01-30 08:36:52.587: E/AndroidRuntime(3408): FATAL EXCEPTION: AsyncTask #1
01-30 08:36:52.587: E/AndroidRuntime(3408): java.lang.RuntimeException: An error occured while executing doInBackground()
01-30 08:36:52.587: E/AndroidRuntime(3408):     at android.os.AsyncTask$3.done(AsyncTask.java:299)
01-30 08:36:52.587: E/AndroidRuntime(3408):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
01-30 08:36:52.587: E/AndroidRuntime(3408):     at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
01-30 08:36:52.587: E/AndroidRuntime(3408):     at java.util.concurrent.FutureTask.run(FutureTask.java:239)
01-30 08:36:52.587: E/AndroidRuntime(3408):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
01-30 08:36:52.587: E/AndroidRuntime(3408):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
01-30 08:36:52.587: E/AndroidRuntime(3408):     at java.lang.Thread.run(Thread.java:856)
01-30 08:36:52.587: E/AndroidRuntime(3408): Caused by: java.lang.NoClassDefFoundError: com.androidhive.googleplacesandmaps.MainActivity
01-30 08:36:52.587: E/AndroidRuntime(3408):     at org.fluturasymphony.recommendation.LoginActivity$DownloadWebPageTask.doInBackground(LoginActivity.java:69)
01-30 08:36:52.587: E/AndroidRuntime(3408):     at org.fluturasymphony.recommendation.LoginActivity$DownloadWebPageTask.doInBackground(LoginActivity.java:1)
01-30 08:36:52.587: E/AndroidRuntime(3408):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
01-30 08:36:52.587: E/AndroidRuntime(3408):     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
01-30 08:36:52.587: E/AndroidRuntime(3408):     ... 3 more

I have declared the manifest as this.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.fluturasymphony.recommendation"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="9"
              android:targetSdkVersion="11" />
    <uses-permission android:name="android.permission.INTERNET" />    
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <application android:icon="@drawable/ic_launcher" android:label="@string/app_name">
        <activity android:label="@string/app_name" android:name=".LoginActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity android:name="org.achartengine.GraphicalActivity" />
        <activity android:name=".CategoryWiseSalesChartActivity" />
        <activity android:name=".ProductWiseSalesChartActivity" />
        <activity android:name="com.androidhive.googleplacesandmaps.MainActivity"/>
        <activity android:label="@string/home_screen" android:name=".HomeActivity" android:configChanges="orientation">            
        </activity>
        <activity android:label="@string/store_screen" android:name=".StoreActivity" android:configChanges="orientation">            
        </activity>
        <activity android:label="@string/store_list_screen" android:name=".StoreListActivity" android:configChanges="orientation">            
        </activity>
        <activity android:label="@string/location_screen" android:name=".StoreMapActivity" android:configChanges="orientation">            
        </activity>
        <activity android:label="@string/recommended_products_list_screen" android:name=".RecommendedProductsListActivity" android:configChanges="orientation">            
        </activity>
        <activity android:label="@string/category_wise_sales_screen" android:name=".CategoryWiseSalesActivity" android:configChanges="orientation">            
        </activity>
        <activity android:label="@string/product_wise_sales_screen" android:name=".ProductWiseSalesActivity" android:configChanges="orientation">            
        </activity>
                <uses-library android:name="com.google.android.maps" />


    </application>



</manifest>

And I am calling the activity in the 2nd class like this.

Intent loginintent = new Intent("com.androidhive.googleplacesandmaps.MainActivity");
                        startActivity(loginintent);

Is this right??

Best Answer

According to Android you can handle this by making the project Library and then Define it in the manifest file and call it in what ever manner you want

for an explanation i did this as per my requirement the activity you want to call on Button click Define it in the Manifest with its full package name and then when you call it on button click the activity of the new project will trigger the sample to do this is following in the manifest file of your 1st project define some thing like this

<activity 
        android:name="packagefull.activityname"
        android:theme="@android:style/Theme.NoTitleBar.Fullscreen">

    </activity>

in the package name define the full path of the the activity you want to call and after the package name give the name of the activity hope this will work for you as this worked perfect for me

Related Solutions

Android – How to save an activity state using the save instance state

You need to override onSaveInstanceState(Bundle savedInstanceState) and write the application state values you want to change to the Bundle parameter like this:

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
  super.onSaveInstanceState(savedInstanceState);
  // Save UI state changes to the savedInstanceState.
  // This bundle will be passed to onCreate if the process is
  // killed and restarted.
  savedInstanceState.putBoolean("MyBoolean", true);
  savedInstanceState.putDouble("myDouble", 1.9);
  savedInstanceState.putInt("MyInt", 1);
  savedInstanceState.putString("MyString", "Welcome back to Android");
  // etc.
}

The Bundle is essentially a way of storing a NVP ("Name-Value Pair") map, and it will get passed in to onCreate() and also onRestoreInstanceState() where you would then extract the values from activity like this:

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  // Restore UI state from the savedInstanceState.
  // This bundle has also been passed to onCreate.
  boolean myBoolean = savedInstanceState.getBoolean("MyBoolean");
  double myDouble = savedInstanceState.getDouble("myDouble");
  int myInt = savedInstanceState.getInt("MyInt");
  String myString = savedInstanceState.getString("MyString");
}

Or from a fragment.

@Override
public void onViewStateRestored(@Nullable Bundle savedInstanceState) {
    super.onViewStateRestored(savedInstanceState);
    // Restore UI state from the savedInstanceState.
    // This bundle has also been passed to onCreate.
    boolean myBoolean = savedInstanceState.getBoolean("MyBoolean");
    double myDouble = savedInstanceState.getDouble("myDouble");
    int myInt = savedInstanceState.getInt("MyInt");
    String myString = savedInstanceState.getString("MyString");
}

You would usually use this technique to store instance values for your application (selections, unsaved text, etc.).

Android – Activity restart on rotation Android

Using the Application Class

Depending on what you're doing in your initialization you could consider creating a new class that extends Application and moving your initialization code into an overridden onCreate method within that class.

public class MyApplicationClass extends Application {
  @Override
  public void onCreate() {
    super.onCreate();
    // TODO Put your application initialization code here.
  }
}

The onCreate in the application class is only called when the entire application is created, so the Activity restarts on orientation or keyboard visibility changes won't trigger it.

It's good practice to expose the instance of this class as a singleton and exposing the application variables you're initializing using getters and setters.

NOTE: You'll need to specify the name of your new Application class in the manifest for it to be registered and used:

<application
    android:name="com.you.yourapp.MyApplicationClass"

Reacting to Configuration Changes [UPDATE: this is deprecated since API 13; see the recommended alternative]

As a further alternative, you can have your application listen for events that would cause a restart – like orientation and keyboard visibility changes – and handle them within your Activity.

Start by adding the android:configChanges node to your Activity's manifest node

 <activity android:name=".MyActivity"
      android:configChanges="orientation|keyboardHidden"
      android:label="@string/app_name">

or for Android 3.2 (API level 13) and newer:

<activity android:name=".MyActivity"
      android:configChanges="keyboardHidden|orientation|screenSize"
      android:label="@string/app_name">

Then within the Activity override the onConfigurationChanged method and call setContentView to force the GUI layout to be re-done in the new orientation.

@Override
public void onConfigurationChanged(Configuration newConfig) {
  super.onConfigurationChanged(newConfig);
  setContentView(R.layout.myLayout);
}

Best Answer

Related Solutions

Android – How to save an activity state using the save instance state

Android – Activity restart on rotation Android

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