Question

Normally I will declare a new activity in AndroidManifest.xml as below:
Let’s say my new activity is Tutorial.java.

<activity android:name=".Tutorial"></activity>

But I found an example, the developer not declare the new activity as above. The code is list as below:

AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.dezine.thebasics"
  android:versionCode="1"
  android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />

<application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".myMain"
              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=".myMenu"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="com.dezine.thebasics.CLEARSCREEN" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

</application>
</manifest>

myMenu.java

package com.dezine.thebasics;
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class myMenu extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final MediaPlayer mpButtonClick = MediaPlayer.create(this, R.raw.click);

    Button bTutorial1 = (Button) findViewById(R.id.button1);
    bTutorial1.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            startActivity(new Intent("com.dezine.thebasics.TUTORIAL"));
            mpButtonClick.start();
        }
    });
    }
}

The above code is work fine at beginning(mean I don’t change anything in AndroidManifest.xml) but it will come out error after I modify something in Manifest.xml. eg. I change the SDK version.

E/AndroidRuntime(5236): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=com.dezine.thebasics.TUTORIAL }

Please tell me how it work. Thank you.

Answer 1

There is a difference between TUTORIAL and Tutorial

Let me give you more detail.

You have written below code to start activity:

  startActivity(new Intent("com.dezine.thebasics.TUTORIAL"));

But you have defined activity inside AndroidManifest.xml as:

<activity android:name=".Tutorial"></activity>

And thats why you are getting this exception.