[android-developers] Button click Navigation not working ( application gets crashes)
This is manifest.xml file:
?xml version=1.0 encoding=utf-8?
manifest xmlns:android=http://schemas.android.com/apk/res/android;
package=button.pack
android:versionCode=1
android:versionName=1.0
application android:icon=@drawable/icon android:label=@string/
app_name
activity android:name=.Activity1
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=.Activity2/activity
/application
uses-sdk android:minSdkVersion=8 /
/manifest
.
Java file: Activity1.Java
package button.pack;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Activity1 extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
Button next = (Button) findViewById(R.id.Button01);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(),
Activity2.class);
startActivityForResult(myIntent, 0);
}
});
}
}
Java file: Activity2.Java
package button.pack;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Activity2 extends Activity {
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
Button next = (Button) findViewById(R.id.Button02);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent intent = new Intent();
setResult(RESULT_OK, intent);
finish();
}
});
}
}
...
Xml Files...
main.xml..
?xml version=1.0 encoding=utf-8?
LinearLayout xmlns:android=http://schemas.android.com/apk/res/
android
android:orientation=vertical
android:layout_width=fill_parent
android:layout_height=fill_parent
android:background=#ff
TextView
android:layout_width=fill_parent
android:layout_height=wrap_content
android:textColor=#00
android:text=This is Activity 2 /
Button
android:text=Previous
android:id=@+id/Button02
android:layout_width=250px
android:textSize=18px
android:layout_height=55px
/Button
/LinearLayout
main2.xml
?xml version=1.0 encoding=utf-8?
LinearLayout xmlns:android=http://schemas.android.com/apk/res/
android
android:orientation=vertical
android:layout_width=fill_parent
android:layout_height=fill_parent
android:background=#ff
TextView
android:layout_width=fill_parent
android:layout_height=wrap_content
android:textColor=#00
android:text=This is Activity 1 /
Button android:layout_width=250px
android:textSize=18px
android:layout_height=55px
android:id=@+id/Button01
android:text=Next
/Button
/LinearLayout
..
This my Logcat:
02-10 13:33:53.962: ERROR/AndroidRuntime(1756): FATAL EXCEPTION: main
02-10 13:33:53.962: ERROR/AndroidRuntime(1756):
java.lang.RuntimeException: Unable to start activity
ComponentInfo{button.pack/button.pack.Activity1}:
java.lang.NullPointerException
02-10 13:33:53.962: ERROR/AndroidRuntime(1756): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
1622)
02-10 13:33:53.962: ERROR/AndroidRuntime(1756): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:
1638)
02-10 13:33:53.962: ERROR/AndroidRuntime(1756): at
android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-10 13:33:53.962: ERROR/AndroidRuntime(1756): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
02-10 13:33:53.962: ERROR/AndroidRuntime(1756): at
android.os.Handler.dispatchMessage(Handler.java:99)
02-10 13:33:53.962: ERROR/AndroidRuntime(1756): at
android.os.Looper.loop(Looper.java:123)
02-10 13:33:53.962: ERROR/AndroidRuntime(1756): at
android.app.ActivityThread.main(ActivityThread.java:3647)
02-10 13:33:53.962: ERROR/AndroidRuntime(1756): at
java.lang.reflect.Method.invokeNative(Native Method)
02-10 13:33:53.962: ERROR/AndroidRuntime(1756): at
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