How to fix android-eclipse HelloWorld application?

Question

I have a problem I am not sure how to ask about. So please give me guidance, as I am a beginner with developing android apps (which is by far the most complicated, cumbersome and confusing thing to do!).

I have created a new "Hello World" project, had to do some other setup stuff (or whatever, not exactly sure what I did), and 'run' my first android application with an enumator. The emulator start, and the app "Hello World" stops immedeately with the message:

The application HelloWorld (process ...) has stopped unexpectedly. Please try again. 

In my eclipse window I see the following three warnings, but I am not sure if it is related to the actual problem above:

Could not locate '/home/alexander/opt/src/android-sdk-linux/extras/android/support/v7/appcompat/bin/android-support-v7-appcompat.jar'. This will not be added to the package.
The type ActionBarActivity is deprecated    MainActivity.java   /HelloWorld/src/com/example/helloworld  line 3  Java Problem
The type ActionBarActivity is deprecated    MainActivity.java   /HelloWorld/src/com/example/helloworld  line 10 Java Problem

Here is the content of MainActivity.java:

package com.example.helloworld;

import android.support.v7.app.ActionBarActivity;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;


@SuppressLint("NewApi") public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

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

How can I fix this problem? How can I even start figuring out what is wrong? Is there any other way to simpler create android applications? Or must it be really complicated, cumbersome and confusing...?

Answer 1

It seems that you don't have the right SDK version. So it can't load ActionBarActivity .

Also ActionBarActivity is depricated so you might want to use AppCompatActivity .

Reference: https://developer.android.com/reference/android/support/v7/app/ActionBarActivity.html

I also recommend to switch to Android Studio because it's easier to manage the SDK.

Answer 2

try this

    Add android-support-v7-appcompat.jar to your Buildpath
    Right click on your Project --> Properties --> Java Build Path --> Libraries tab --> Add External JAR --> Browse --> add android-support-v7-appcompat.jar --> ok --> Apply --> ok

    Clean and build your project and run.

Hopefully this will work...

Answer 3

Replace your MainActivity.java with the below code

package com.example.helloworld;

    import android.app.Activity;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.MenuItem;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

}