安卓电话拨号器小项目

一、画UI

二、写业务逻辑，在mainActivity里面写，在onCreat方法里面写逻辑，

package com.example.call;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

    private EditText et_number;
	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_number = (EditText) findViewById(R.id.editText1);
        
        //finded the button.
        Button btn_call=(Button) findViewById(R.id.button1);
        //setting a thing of cliking.
        btn_call.setOnClickListener(new MyClickListener());
        
    }
    //define a class to realize it.
    private class MyClickListener implements android.view.View.OnClickListener{


		public void onClick(View v) {
			//get text
			String number=et_number.getText().toString().trim();
			if("".equals(number)){
				/**
				 * context:全局
				 */
				Toast.makeText(MainActivity.this, "number can't be blank", Toast.LENGTH_SHORT).show();;
			    return;
			}
			
			//call,意图intent
			Intent intent=new Intent();//creat a intent's 
			intent.setAction(Intent.ACTION_CALL);
			//SET A DATE THAT YOU WANT TO CALL
			/**
			 *  uri：统一资源标识符，自己定义的路径，想代表什么就代表什么
			 *  url:全球统一资源定位符：如www.baidu.com
			 */
			intent.setData(Uri.parse("tel:"+number));//set a number to call.
			//start intent.
			startActivity(intent);
			// TODO Auto-generated method stub
			System.out.println("....."+number);
		}
    }
}

三、给按钮设置一个事件

四、自己定义一个类去实现方法需要的类

五、一定要记得加上拨打的权限