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：

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Phone拨号器</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>
    <string name="mobile">请输入手机号码：</string>
    <string name="button">拨打电话</string>

</resources>

3、编写main.xml文件。具体代码如下：

<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.phone.MainActivity$PlaceholderFragment" >
<LinearLayout android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent">
              <TextView
                  android:layout_width="fill_parent"
                  android:layout_height="wrap_content"
                  android:text="@string/mobile"
                  />
              <EditText 
                  android:layout_width="fill_parent"
                  android:layout_height="wrap_content"
                  android:id="@+id/phoneNum"/>
              <Button 
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="@string/button"
                  android:id="@+id/btnPhone"/>
</LinearLayout>
</RelativeLayout>

4、处理按钮的单击事件。具体代码如下：

package com.example.phone;

import android.app.Activity;
import android.app.Fragment;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (savedInstanceState == null) {
            getFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment()).commit();
        }
    }

    @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);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container,
                    false);
        
        final EditText phoneText=(EditText)rootView.findViewById(R.id.phoneNum);
            Button btnPhone=(Button)rootView.findViewById(R.id.btnPhone);
            btnPhone.setOnClickListener(new View.OnClickListener() {
                
                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    String phoneNum=phoneText.getText().toString();
                    if(phoneNum!=null&&(!"".equals(phoneNum.trim())))
                    {
                        Intent intent=new Intent(Intent.ACTION_CALL,Uri.parse("tel:"+phoneNum));
                        startActivity(intent);
                    }
                }
            });
            return rootView;
        }
    }

}

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：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.phone"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.phone.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <uses-permission android:name="android.permission.CALL_PHONE"/>
</manifest>