Android_向用户发送短信

一段代码，用的时候copy就行

记得在manifest里声明send-sms和read-sms权限

public class SendMsgActivity extends AppCompatActivity {
    private EditText editText,editText1;
    private Button button;
    private static final int SEND_SMS = 100;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_send_msg);
        editText=findViewById(R.id.send_et_phone);
        editText1=findViewById(R.id.send_et_have);
        button=findViewById(R.id.send_btn);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                requestPermission();
            }
        });
    }
    private void requestPermission() {
        //判断Android版本是否大于23
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            int checkCallPhonePermission = ContextCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE);
            if (checkCallPhonePermission != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.SEND_SMS},SEND_SMS);
                return;
            } else {
                sendSMSS();
                //已有权限
            }
        } else {
            //API 版本在23以下
        }
    }

    /**
     * 注册权限申请回调
     *
     * @param requestCode  申请码
     * @param permissions  申请的权限
     * @param grantResults 结果
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        switch (requestCode) {
            case SEND_SMS:
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    sendSMSS();
                } else {
                    // Permission Denied
                    Toast.makeText(SendMsgActivity.this, "CALL_PHONE Denied", Toast.LENGTH_SHORT).show();
                }
                break;
            default:
                super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }

    //发送短信
    private void sendSMSS() {
        String content = editText1.getText().toString().trim();
        String phone = editText.getText().toString().trim();
        if (!content.equals("")&&!phone.equals("")) {
            SmsManager manager = SmsManager.getDefault();
            ArrayList<String> strings = manager.divideMessage(content);
            for (int i = 0; i < strings.size(); i++) {
                manager.sendTextMessage(phone, null, content, null, null);
            }
            Toast.makeText(SendMsgActivity.this, "发送成功", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "手机号或内容不能为空", Toast.LENGTH_SHORT).show();
            return;
        }
    }
}