android学习笔记002-拨打电话(优化)

主要是把打电话这个按钮的相应代码写成一个方法,通过调用这个方法来使代码看起来更加简洁工整:

MainActivity.java的代码如下:

package com.example.dailcall;



import android.support.v7.app.ActionBarActivity;

import android.text.TextUtils;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;//创建一个onClickListener接口的时候要导入这个包名

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;





public class MainActivity extends ActionBarActivity {



    // 定义组建

    private EditText et;

    private Button btn;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        et=(EditText) findViewById(R.id.et_number); //通过findViewById来查找组建名,绑定到定义的组建变量。

        btn=(Button) findViewById(R.id.btn_dail);

        btn.setOnClickListener(new MyClickListener());

      

    }

    

    private class MyClickListener implements OnClickListener{



        @Override

        public void onClick(View v) {

            // TODO Auto-generated method stub

            

            callNumber();

            

        }

        

        

        

    }





    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }



    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }

//把callNumber()这个动作写成一个私有的方法

    private void callNumber() {

        Intent intent=new Intent();

        

        String number=et.getText().toString().trim();

        

        if (TextUtils.isEmpty(number)) {

            Toast.makeText(MainActivity.this, "电话号码不能为空!", 0).show();

            return;

        }

        

        intent.setAction(Intent.ACTION_CALL);

        intent.setData(Uri.parse("tel:"+number));

        

        startActivity(intent);

    }

}

 

activity_main.xml的代码如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.example.dailcall.MainActivity" >



    <EditText

        android:id="@+id/et_number"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:inputType="phone" >

        <requestFocus />

    </EditText>



    <Button

        android:id="@+id/btn_dail"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/et_number"

        android:text="@string/dail" />



</RelativeLayout>

 

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