Android发送短信

package com.jsjrjsb1504.sdut.testdemo;

import android.app.PendingIntent;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    EditText number,content;
    SmsManager smsManager;
    Button send;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取smsManager
        smsManager = smsManager.getDefault();
        //获取程序界面从两个文本框和按钮
        number = findViewById(R.id.number);
        content = findViewById(R.id.content);
        send = findViewById(R.id.send);
        send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //创建一个PendingIntent 对象
                PendingIntent pi =  PendingIntent.getActivity(MainActivity.this,0,new Intent(),0);
                smsManager.sendTextMessage(number.getText().toString(),null,content.getText().toString(),pi,null);
                //提示短信发送成功
                Toast.makeText(MainActivity.this,"短信发送成功",Toast.LENGTH_LONG).show();

            }
        });

    }
}