Android电话拨号器

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               <TextView14                   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     @Override19     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     @Override30     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     @Override38     public boolean onOptionsItemSelected(MenuItem item) {39         // Handle action bar item clicks here. The action bar will40         // automatically handle clicks on the Home/Up button, so long41         // 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         @Override58         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                 @Override68                 public void onClick(View v) {69                     // TODO Auto-generated method stub70                     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     <application12         android:allowBackup="true"13         android:icon="@drawable/ic_launcher"14         android:label="@string/app_name"15         android:theme="@style/AppTheme" >16         <activity17             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>

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