Android电话拨号器

浏览数：20 / 时间：2015年06月11日

android电话拨号器的设计

具体的运行界面如上图所示。

具体操作过程：

1、新建一个Android项目。在Eclipse中依次单击“File”->“NEW”->"Android Project"

2、编写string.xml文件。具体代码如下：

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <resources>
 3 
 4     <string name="app_name">Phone拨号器</string>
 5     <string name="hello_world">Hello world!</string>
 6     <string name="action_settings">Settings</string>
 7     <string name="mobile">请输入手机号码：</string>
 8     <string name="button">拨打电话</string>
 9 
10 </resources>

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3、编写main.xml文件。具体代码如下：

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:paddingBottom="@dimen/activity_vertical_margin"
 6     android:paddingLeft="@dimen/activity_horizontal_margin"
 7     android:paddingRight="@dimen/activity_horizontal_margin"
 8     android:paddingTop="@dimen/activity_vertical_margin"
 9     tools:context="com.example.phone.MainActivity$PlaceholderFragment" >
10 <LinearLayout android:orientation="vertical"
11               android:layout_width="fill_parent"
12               android:layout_height="fill_parent">
13               <TextView
14                   android:layout_width="fill_parent"
15                   android:layout_height="wrap_content"
16                   android:text="@string/mobile"
17                   />
18               <EditText 
19                   android:layout_width="fill_parent"
20                   android:layout_height="wrap_content"
21                   android:id="@+id/phoneNum"/>
22               <Button 
23                   android:layout_width="wrap_content"
24                   android:layout_height="wrap_content"
25                   android:text="@string/button"
26                   android:id="@+id/btnPhone"/>
27 </LinearLayout>
28 </RelativeLayout>

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4、处理按钮的单击事件。具体代码如下：

 1 package com.example.phone;
 2 
 3 import android.app.Activity;
 4 import android.app.Fragment;
 5 import android.content.Intent;
 6 import android.net.Uri;
 7 import android.os.Bundle;
 8 import android.view.LayoutInflater;
 9 import android.view.Menu;
10 import android.view.MenuItem;
11 import android.view.View;
12 import android.view.ViewGroup;
13 import android.widget.Button;
14 import android.widget.EditText;
15 
16 public class MainActivity extends Activity {
17 
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.activity_main);
22 
23         if (savedInstanceState == null) {
24             getFragmentManager().beginTransaction()
25                     .add(R.id.container, new PlaceholderFragment()).commit();
26         }
27     }
28 
29     @Override
30     public boolean onCreateOptionsMenu(Menu menu) {
31 
32         // Inflate the menu; this adds items to the action bar if it is present.
33         getMenuInflater().inflate(R.menu.main, menu);
34         return true;
35     }
36 
37     @Override
38     public boolean onOptionsItemSelected(MenuItem item) {
39         // Handle action bar item clicks here. The action bar will
40         // automatically handle clicks on the Home/Up button, so long
41         // as you specify a parent activity in AndroidManifest.xml.
42         int id = item.getItemId();
43         if (id == R.id.action_settings) {
44             return true;
45         }
46         return super.onOptionsItemSelected(item);
47     }
48 
49     /**
50      * A placeholder fragment containing a simple view.
51      */
52     public static class PlaceholderFragment extends Fragment {
53 
54         public PlaceholderFragment() {
55         }
56 
57         @Override
58         public View onCreateView(LayoutInflater inflater, ViewGroup container,
59                 Bundle savedInstanceState) {
60             View rootView = inflater.inflate(R.layout.fragment_main, container,
61                     false);
62         
63         final EditText phoneText=(EditText)rootView.findViewById(R.id.phoneNum);
64             Button btnPhone=(Button)rootView.findViewById(R.id.btnPhone);
65             btnPhone.setOnClickListener(new View.OnClickListener() {
66                 
67                 @Override
68                 public void onClick(View v) {
69                     // TODO Auto-generated method stub
70                     String phoneNum=phoneText.getText().toString();
71                     if(phoneNum!=null&&(!"".equals(phoneNum.trim())))
72                     {
73                         Intent intent=new Intent(Intent.ACTION_CALL,Uri.parse("tel:"+phoneNum));
74                         startActivity(intent);
75                     }
76                 }
77             });
78             return rootView;
79         }
80     }
81 
82 }

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5、申请拨号权限。我们需要在功能清单文件AndroidManifest.xml中申请权限，在</application>标签后面加上<uses-permission>具体代码如下：

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.example.phone"
 4     android:versionCode="1"
 5     android:versionName="1.0" >
 6 
 7     <uses-sdk
 8         android:minSdkVersion="14"
 9         android:targetSdkVersion="19" />
10 
11     <application
12         android:allowBackup="true"
13         android:icon="@drawable/ic_launcher"
14         android:label="@string/app_name"
15         android:theme="@style/AppTheme" >
16         <activity
17             android:name="com.example.phone.MainActivity"
18             android:label="@string/app_name" >
19             <intent-filter>
20                 <action android:name="android.intent.action.MAIN" />
21 
22                 <category android:name="android.intent.category.LAUNCHER" />
23             </intent-filter>
24         </activity>
25     </application>
26     <uses-permission android:name="android.permission.CALL_PHONE"/>
27 </manifest>