A simple Android example,including Intent/View/...

I try to give the example for learning how to use the intent to redirect  one activity to other activity.

Environment:

       android 4.0

       elipse 3.62

       jdk 1.6.0_26

First ,create two activities,Activity1 and Activity2(from activity1 to activity2)

src/Activity1.java

public class Activity1 extends Activity{
   @override
   public void onCreate(Bundle savedInstanceState){
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      final Button button = (Button)findViewById(R.id.button.id);
      button.setOnClickListener(new View.OnClickListener(){
          public void onClick(View v){
            doSubmit(v);
          }

      });
   }

   public void doSubmit(View target){
      switch(target.getId()){
         case R.id.button_id:
              startActivity(new Intent(getApplicationContext(),Activity2.class));
      }
   }

}

 

src/Activity2.java

public class Activity2 extends Activity{
   @override
   public void onCreate(Bundle savedInstanceState){
      super.onCreate(savedInstanceState);
      setContentView(R.layout.other);
    
   }
}

 

res/layout/main.xml

<? version="1.0" encoding="utf-8" ?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical"

<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_parent"
   android:text="@string/hello"
/>
<Button
   android:id="@+id/button_id"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:text="submit"
   android:onClick="doSubmit"
/>

>
</LinerLayout>

/res/layout/other.xml

<? version="1.0" encoding="utf-8" ?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical"

<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_parent"
   android:text="@string/activity2"
/>


>
</LinerLayout>

res/values/strings.xml

<? version="1.0" encoding="utf-8" ?>
<resources>
   <string name="hello"> hello,activity1</string>
   <string name="app_name">Test</string>
   <string name="activity2">activity2</string>
</resources>

AndroidManifest.xml

<application
   android:icon="@drawable/ic_launcher"
   android:label="@string/app_name"
 
>
 <activity
    android:label="@string/app_name"
    android:name=".Activity1">
    <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>

some tips:

View Direct  Subclasses 

AnalogClock, ImageView, KeyboardView, ProgressBar, Space, SurfaceView, TextView, TextureView, ViewGroup, ViewStub

View Indirect Subclasses

Button, CheckBox, EditText, GridView, ListView and so on.
you can link
http://developer.android.com/reference/android/view/View.html
for more information.

when submit ,you also can do like this:
Activity1.java

public class Activity1 extends Activity{
   @override
   public void onCreate(Bundle savedInstanceState){
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      final Button button = (Button)findViewById(R.id.button.id);
      button.setOnClickListener(new View.OnClickListener(){
          public void onClick(View v){
            startActivity(new Intent(getApplicationContext(),Activity2.class));
          }

      });
   }
}