AndroidCallPhone

package com.example.helloworld;

import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class HelloWorld_Activity extends Activity {

private EditText et_number;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//初始化控件
setContentView(R.layout.helloworld_activity);
Button button1 = (Button) findViewById(R.id.bt_1);
et_number = (EditText) findViewById(R.id.et_number);
//点击事件
button1.setOnClickListener(new OnClickListener() {

@SuppressLint("ShowToast") @Override
public void onClick(View v) {
//获取电话号码
String number = et_number.getText().toString().trim();
//判断号码是否为空
if(TextUtils.isEmpty(number)){
//号码为空则提醒使用者号码不能为空
Toast.makeText(HelloWorld_Activity.this, "号码不能为空", Toast.LENGTH_SHORT).show();
}else{
//号码不为空则执行拨号的方法
Intent intent = new Intent();
intent.setAction(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:"+number));
startActivity(intent);

}
}
});
}

}

<!---   AndroidManifest.xml--->

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.helloworld"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".HelloWorld_Activity"
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>
</manifest>
<!--   helloworld_activity.xml    -- >
<LinearLayout 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:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="电话：" /
<EditText
android:id="@+id/et_number"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:hint="请输入电话号码"
/>
<Button
android:id="@+id/bt_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="拨打"
android:background="#ffeecc"
/>
</LinearLayout>