Android实例-拨打电话

（1）项目结构如下：

（2）MainActivity.java

package com.example.phonecall;

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

public class MainActivity extends Activity {

private Button button;
private EditText editText;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) this.findViewById(R.id.button1);
editText = (EditText) this.findViewById(R.id.editText1);
button.setOnClickListener(new ButtonClickListener());
}

private final class ButtonClickListener implements View.OnClickListener {

@Override
public void onClick(View v) {
String number = editText.getText().toString();

Intent intent = new Intent();
/*
 * 拨号的话要在清单文件中添加拨号权限
 */
intent.setAction("android.intent.action.CALL");
intent.addCategory("android.intent.category.DEFAULT");
intent.setData(Uri.parse("tel:" + number));

startActivity(intent);
}

}

@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;
}

}

（3）

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

    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="请输入你的手机号" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="拨号" />

</LinearLayout>

清单文件中加入权限：

 <uses-permission android:name="android.permission.CALL_PHONE" />