Android手机开发小例子

Android小例子

This is technically very easy. Once you got Eclipse and Android installed and running on your computer (I use a Mac OS Leopard poweredMacBook but you can use a Microsoft Windows XP/Vista/etc. PC as well) you just start Eclipse. Now you just go to “New ? Project... ? Android ? Android Project...” and enter the required data. Once you are done the result might look like this:

Now you can start writing and customize the default “Hello World” a.k.a. “Hello Android” app which just shows a text field. If you are really really lazy you could also copy/paste the following code:

packagecom.DialANumber;

importandroid.app.Activity;

import android.content.Intent;

import https://www.360docs.net/doc/782976042.html,.Uri;

import android.os.Bundle;

import android.view.KeyEvent;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.LinearLayout;

public class DialANumber extends Activity {

EditTextmEditText_number = null;

LinearLayoutmLinearLayout_no_button = null;

Button mButton_dial = null;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

mLinearLayout_no_button = new LinearLayout(this); mEditText_number = new EditText(this);

mEditText_number.setText("5551222");

mLinearLayout_no_button.addView(mEditText_number) ;

mButton_dial = new Button(this);

mButton_dial.setText("Dial!");

mLinearLayout_no_button.addView(mButton_dial);

mButton_dial.setOnClickListener(new

View.OnClickListener() {

public void onClick(View v) {

performDial();

}

});

setContentView(mLinearLayout_no_button);

}

public booleanonKeyDown(intkeyCode, KeyEvent event) {

if (keyCode == KeyEvent.KEYCODE_CALL) {

performDial();

return true;

}

return false;

}

public void performDial(){

if(mEditText_number!=null){

try {

startActivity(new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + mEditText_number.getText())));

} catch (Exception e) {

e.printStackTrace();

}

}//if

}

}

That was quick!

Now you should create a debug runtime configuration which can be done at “Run ? Debug Configurations…“. Here you select “AndroidApplication” and press “New“. Enter a name and select the “DialANumber” project. Launching the default Activity might be a goodidea as we not know what the f*** it means right now. So just hit “Apply” and “Debug” and the program will be started in the Android simulator. To give you a clue how that looks like here are some screenshots:

As there is an EditField for the phone number which can be modified you can also enter a new phone number in there. An example of this comes here:

As everyone can see we are able to dial the number in two different ways:

1.Hit the “Dial!” button next to the input field.

2.Hit the “green dial” button on the bottom of the device.

Here is an illustration of this:

That’s it. Pretty easy, huh?

I am looking forward to find some time in the near future to pimp this example a bit. I am thinking of a number field filter adding (which looks a bit confusing in the API documentation) or something else. Suggestions are welcome!