[android] 短信发送器

package com.tsh.sms;

import java.util.ArrayList;

 android.app.Activity;
 android.os.Bundle;
 android.telephony.SmsManager;
 android.text.TextUtils;
 android.view.View;
 android.view.View.OnClickListener;
 android.widget.Button;
 android.widget.EditText;
 android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {
    private EditText et_number;
     EditText et_content;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button bt_send=(Button) findViewById(R.id.bt_send);
        et_number=(EditText) findViewById(R.id.et_number);
        et_content=(EditText) findViewById(R.id.et_content);
        bt_send.setOnClickListener(this);
    }

    @Override
     onClick(View v) {
        switch (v.getId()) {
        case R.id.bt_send:
            String number=et_number.getText().toString().trim();
            String content=et_content.getText().toString().trim();
            if(TextUtils.isEmpty(number)||TextUtils.isEmpty(content)){
                Toast.makeText(this,"电话号码和内容都不能为空",Toast.LENGTH_SHORT).show();
                return;
            }
            SmsManager smsManager=SmsManager.getDefault();
            ArrayList<String> contents = smsManager.divideMessage(content);
            for(String str:contents){
                smsManager.sendTextMessage(number,null,str,null);
            }
            
            break;
        }
    }
}

<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
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight
    android:paddingTop
    tools:context="com.tsh.sms.MainActivity" >

    TextView
        android:id="@+id/tv_input_number"
        android:layout_width="wrap_content"
        android:layout_height
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop
        android:text="@string/input_tel_number" />

    EditText
        ="@+id/et_number"
        android:singleLine
        android:layout_below="@id/tv_input_number"
        android:ems="10"
        android:inputType="phone" >

        requestFocus />
    </EditText="@+id/tv_number"="@id/et_number"="@string/sms_content" ="@+id/et_content"
        android:lines="5"="@id/tv_number"="10" Button
        ="@+id/bt_send"="@id/et_content"="@string/send" />

RelativeLayout>