Question

I just started learning Android yesterday and would like to code a very simple app that consists of 2 views for learning purpose.

Activity/View 1: 1 button and a text “Hello World”
On clicking the button, it should go to the next activity/view which only has text “testing”.

Here’s my code for activity 1:

package helloworld.app;


import android.os.Bundle; 
import android.app.Activity; 
import android.view.Menu; 
import android.view.MenuItem; import
android.support.v4.app.NavUtils; 
/*import AudioRecordTest;*/

public class MainActivity extends Activity {

 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
 }
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
     getMenuInflater().inflate(R.menu.activity_main, menu);
     return true;
 }

 public void startRecording() {
    setContentView(R.layout.next_page);
 }
  }

Here’s my code for activity 2:
package helloworld.app;

import android.os.Bundle; 
import android.app.Activity; import
android.view.Menu; 
import android.view.MenuItem; import
android.support.v4.app.NavUtils; 
/*import AudioRecordTest;*/

public class next_page extends Activity {

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

Here’s my code for xml file for activity 1:

<RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent" >

 <TextView
     android:id="@+id/textView1"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_centerHorizontal="true"
     android:layout_centerVertical="true"
     android:padding="@dimen/padding_medium"
     android:text="@string/hello_world"
     tools:context=".MainActivity" />

 <Button
     android:id="@+id/button1"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_alignParentTop="true"
     android:layout_alignRight="@+id/textView1"
     android:layout_marginRight="40dp"
     android:layout_marginTop="32dp"
     android:text="Start Recording"
     android:onClick="startRecording" />

</RelativeLayout>

EDIT:
Here are my error messages from logcat

08-01 07:00:49.253: I/Choreographer(1326): Skipped 40 frames! The
application may be doing too much work on its main thread.

08-01 07:01:11.653: D/AndroidRuntime(1326): Shutting down VM

08-01 07:01:11.653: W/dalvikvm(1326): threadid=1: thread exiting with
uncaught exception (group=0x40a13300)

08-01 07:01:11.673: E/AndroidRuntime(1326): FATAL EXCEPTION: main

08-01 07:01:11.673: E/AndroidRuntime(1326):
java.lang.IllegalStateException: Could not find a method
startRecording(View) in the activity class helloworld.app.MainActivity
for onClick handler on view class android.widget.Button with id
‘button1’

08-01 07:01:11.673: E/AndroidRuntime(1326): at
android.view.View$1.onClick(View.java:3578)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
android.view.View.performClick(View.java:4084)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
android.view.View$PerformClick.run(View.java:16966)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
android.os.Handler.handleCallback(Handler.java:615)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
android.os.Handler.dispatchMessage(Handler.java:92)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
android.os.Looper.loop(Looper.java:137)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
android.app.ActivityThread.main(ActivityThread.java:4745)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
java.lang.reflect.Method.invokeNative(Native Method)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
java.lang.reflect.Method.invoke(Method.java:511)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
dalvik.system.NativeStart.main(Native Method)

08-01 07:01:11.673: E/AndroidRuntime(1326): Caused by:
java.lang.NoSuchMethodException: startRecording [class
android.view.View]

08-01 07:01:11.673: E/AndroidRuntime(1326): at
java.lang.Class.getConstructorOrMethod(Class.java:460)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
java.lang.Class.getMethod(Class.java:915)

08-01 07:01:11.673: E/AndroidRuntime(1326): at
android.view.View$1.onClick(View.java:3571)

08-01 07:01:11.673: E/AndroidRuntime(1326): … 11 more

EDIT2:
I found my mistake! I am supposed to pass in View view for my startRecording function. Here’s the edited code:

public void startRecording(View view) 
{
Intent intent = new Intent(this, next_page.class);  
startActivity(intent); 
}

Answer 1

To make it work this should be your startRecording method:

public void startRecording(View v) {     
    // setContentView(R.layout.next_page); this will modify the current activity view
    // if you want to start a new activity:
    Intent i = new Intent(this, next_page.class);
    startActivity(i);
}

Make sure you have declared both activities in the manifest file.
For android to “see” and use your activities the must be declared in the AndroidManifest.xml file:

// ...
<activity android:name=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

You should read from the android developers site or some tutorials, this is basic stuff.