android手机拨号器实现

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

    <string name="app_name">手机拨号器</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>
    <string name="reminder">请输入手机号</string>
    <string name="call">拨打此号码</string>

</resources>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
</LinearLayout>

package com.example.phone;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
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.os.Build;

public class MainActivity extends ActionBarActivity {

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

        /* 注释掉
        if (savedInstanceState == null) {
            getSupportFragmentManager().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.
     */
    /* 注释掉
    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);
            return rootView;
        }
    }
    */
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    
      <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/reminder" />
    
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:id="@+id/mobile" />
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:text="@string/call"
        android:id="@+id/button" />

</LinearLayout>

package com.example.phone;

 ...   // 系统默认import的类省略不写
  
import android.widget.Button;
import android.app.Activity;
import android.widget.EditText;
import android.content.Intent;
import android.net.Uri;

public class MainActivity extends Activity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);    
            
        Button button = (Button) this.findViewById(R.id.button);
        button.setOnClickListener(new ButtonClickListener());
        
        if (savedInstanceState == null) {
        }
    }
    
    private final class ButtonClickListener implements View.OnClickListener{
        public void onClick(View v){
            EditText mobileText = (EditText) findViewById(R.id.mobile);
            String number = mobileText.getText().toString();
            Uri uri = Uri.parse("tel:" + number);
            Intent it = new Intent(Intent.ACTION_DIAL, uri);
            startActivity(it);
        }
    }
    
    // 其余系统生成代码省略未显示
    ... 
}

<?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="8"
        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>
    
    <permission android:name="android.permission.CALL_PHONE" />
    
</manifest>