Hello, TimePicker

A TimePicker is a Widget that allows the User to Select the time by hour, minute and AM or PM.
 
 
Start a new project / Activity called HelloTimePicker.
 
Modify HelloTimePicker.java code is as follows:
 

package com.example.test;
import java.util.Calendar;
import android.app.Activity;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;
public class HelloTimePicker extends Activity (private TextView mTimeDisplay;
private Button mPickTime;
private int mHour;
private int [...]

Hello, WebView

A WebView allows you to Create your own Web Browser Activity. In this Tutorial, we'll Create a simple Activity that can View Web pages.

Learning Address: http://androidappdocs.appspot.com/guide/tutorials/views/hello-webview.html

HelloWebView.java Code

package com.example.test; import android.app.Activity; import android.os.Bundle; import android.webkit.WebView; public class HelloWebView extends Activity (WebView webview; [...]

Hello, RelativeLayout

A RelativeLayout is a ViewGroup that allows you to layout child elements in positions relative to the parent or siblings elements.

Start a new project / Activity called HelloRelativeLayout.
Open the layout file. Make it like so:

<? xml version = "1.0" encoding = "utf-8"?> [...]

HelloSpinner.java Source

package com.example.test; import android.app.Activity; import android.os.Bundle; import android.widget.ArrayAdapter; import android.widget.Spinner; public class HelloSpinner extends Activity (@ Overridepublic void onCreate (Bundle savedInstanceState) ( super.onCreate (savedInstanceState); setContentView (R.layout.main); Spinner s = (Spinner) findViewById (R.id.spinner); ArrayAdapter adapter = ArrayAdapter.createFromResource (this, R.array.planets, android.R. layout.simple_spinner_item); adapter.setDropDownViewResource (android.R.layout.simple_spinner_dropdown_item); s.setAdapter (adapter);))

layout-> main.xml

[...]

In the development for the control to add Listener is a very common work, the easiest way to add Listener can be:

findViewById (R.id.myButton). setOnClickListener (new View.OnClickListener () (public void onClick (View v) (/ / Do stuff)));

Add a Listener using the above method has a drawback is that if [...]

Hello, MapView
Learning Address: http://androidappdocs.appspot.com/guide/tutorials/views/hello-mapview.html

HelloItemizedOverlay.java Code

package com.example.test; import java.util.ArrayList; import android.graphics.drawable.Drawable; import com.google.android.maps.ItemizedOverlay; import com.google.android.maps.OverlayItem; public class HelloItemizedOverlay extends ItemizedOverlay (private ArrayList <OverlayItem> mOverlays = new ArrayList <OverlayItem> (); public HelloItemizedOverlay (Drawable defaultMarker) (super (boundCenterBottom (defaultMarker ));// TODO Auto-generated constructor stub) @ Overridepublic int size [...]