Question

the purpose of this activity/program is to simply switch from this activity to another one using a button. From IzzynActivity to notes. Here is the android manifest:

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

    <uses-sdk android:minSdkVersion="10" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="izzy.n.IzzynActivity"
            android:label="@string/app_name" >
            <activity
                android:name="izzy.n.notes"
                android:label="@string/notes"></activity>
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

And here is the IzzynActivity.java code:

package izzy.n;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;


public class IzzynActivity extends Activity{

    /** Called when the activity is first created. */
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button wg = (Button) findViewById(R.id.button1);
        wg.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                Intent myIntent = new Intent(IzzynActivity.this, notes.class);
                IzzynActivity.this.startActivity(myIntent);
            }

        });
    }
}

Answer 1

An activity cannot contain another activity in the AndroidManifest.xml file. Here’s the right code:

    <uses-sdk android:minSdkVersion="10" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="izzy.n.IzzynActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />    
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="izzy.n.notes"
            android:label="@string/notes"></activity>
    </application>

</manifest>

Note:

If you return anything with setResult() from a started activity you should start it using startActivityForResult.

For the warning message:

Just edit one piece of code and re-run your application. It will be reinstalled on the phone and you should not see the warning message again.