本示例使用的发卡器：Android Linux RFID读写器NFC发卡器WEB可编程NDEF文本/网址/海报-淘宝网 (taobao.com) 

 

package com.usbreadertest;

import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import com.reader.ourmifare;

public class NdefwifiActivity extends AppCompatActivity {
    private TextView tv;
    private EditText ctrwifiname;
    private Spinner ctrauth;
    private Spinner ctrkeyalgorithm;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ndef_wifi);

        androidx.appcompat.widget.Toolbar toolbar=findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        tv = findViewById(R.id.sample_text);
        tv.setText("操作结果");

        ctrauth=findViewById(R.id.spin_Selauthtype);
        ctrauth.setSelection(7);

        ctrkeyalgorithm=findViewById(R.id.spin_Selkeytype);
        ctrkeyalgorithm.setSelection(4);

        ctrwifiname=findViewById(R.id.Edittextname);
        ctrwifiname.requestFocus();
    }

    @Override
    public void onBackPressed(){
        super.onBackPressed();
        finish();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if(item.getItemId()==android.R.id.home){
            finish();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    public void retmain(View view)
    {
        finish();
    }

    public void writewifitag(View view)    {
        String wifinamestr=ctrwifiname.getText().toString().trim();
        if (wifinamestr.length()<1){
            tv.setText("请输入网络名称！");
            ctrwifiname.requestFocus();
            return;
        }
        byte[] wifinamebyte=wifinamestr.getBytes();
        int wifinamelen=wifinamebyte.length;

        int authtype=(int)(ctrauth.getSelectedItemId());
        int keytype=(int)(ctrkeyalgorithm.getSelectedItemId());

        EditText ctrwifikey=findViewById(R.id.Edittextkey);
        String wifikeystr=ctrwifikey.getText().toString().trim();
        byte[] wifikeybyte=wifikeystr.getBytes();
        int keylen=wifikeybyte.length;

        ourmifare.tagbufclear();  //清空数据缓冲
        byte status=ourmifare.tagbufaddwifi(wifinamebyte,wifinamelen,authtype,keytype,wifikeybyte,keylen);  //将要写的NDEF信息加入到写缓冲
        if (status==0){
            int tagtype=NdefTextActivity.CheckCardType();    //检测发卡器上的标签类型
            if(tagtype==-1){
                tv.setText("发卡器感应区未发现有效的NDEF标签！");
                return;
            }
            byte[] mypiccserial=new byte[8];
            status=NdefTextActivity.WriteTag(tagtype,mypiccserial);      //将已生成的NDEF缓冲数据写入不同的标签
            String dispinfo=NdefTextActivity.dispwritetag(status ,mypiccserial,tagtype);
            tv.setText(dispinfo);
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="3dp"
    tools:context=".NdefwifiActivity">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:background="?attr/colorPrimary"
        app:navigationIcon="@drawable/baseline_arrow_back_ios_24"
        app:titleTextColor="@color/white"
        tools:ignore="MissingConstraints"
        tools:layout_editor_absoluteY="0dp">

        <TextView
            android:id="@+id/TextViewlabelDispleft"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="返回"
            android:textColor="@color/white"
            android:textSize="16sp"
            android:gravity="center"
            android:onClick="retmain" />

        <TextView
            android:id="@+id/TextViewlabelDisp"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="NDEF_WIFI  "
            android:textColor="@color/white"
            android:textSize="16sp"
            android:gravity="center_horizontal|right|center"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/TextViewlabelDispleft"
            app:layout_constraintTop_toTopOf="parent" />

    </androidx.appcompat.widget.Toolbar>

    <TextView
        android:id="@+id/sample_text"
        android:layout_width="fill_parent"
        android:layout_height="150dp"
        android:padding="3dp"
        android:text="操作结果"
        android:textSize="12sp"
        android:background="@drawable/shape4border"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        />

    <ScrollView
        android:id="@+id/scrollViewIC"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_marginBottom="5dp"

        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/toolbar"
        app:layout_constraintBottom_toTopOf="@+id/sample_text"
        android:scrollbars="horizontal"
        >

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="3dp"       >

            <TextView
                android:id="@+id/textlablename"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:text="网络名称:"
                android:textSize="16sp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <EditText
                android:id="@+id/Edittextname"
                android:layout_width="330dp"
                android:layout_height="wrap_content"
                android:textSize="16sp"
                android:gravity="left"
                android:text=""
                app:layout_constraintBottom_toBottomOf="@+id/textlablename"
                app:layout_constraintLeft_toRightOf="@+id/textlablename"
                app:layout_constraintTop_toTopOf="@+id/textlablename" />

            <TextView
                android:id="@+id/textlableauthtype"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:text="认证方式:"
                android:textSize="16sp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/textlablename" />

            <Spinner
                android:id="@+id/spin_Selauthtype"
                android:layout_width="330dp"
                android:layout_height="wrap_content"
                android:entries="@array/wifiauthtype"
                android:theme="@style/my_spinner_style"
                app:layout_constraintBottom_toBottomOf="@+id/textlableauthtype"
                app:layout_constraintLeft_toRightOf="@+id/textlableauthtype"
                app:layout_constraintTop_toTopOf="@+id/textlableauthtype" />

            <TextView
                android:id="@+id/textlablekeytype"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:text="加密算法:"
                android:textSize="16sp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/textlableauthtype" />

            <Spinner
                android:id="@+id/spin_Selkeytype"
                android:layout_width="330dp"
                android:layout_height="wrap_content"
                android:entries="@array/wifikeytype"
                android:theme="@style/my_spinner_style"
                app:layout_constraintBottom_toBottomOf="@+id/textlablekeytype"
                app:layout_constraintLeft_toRightOf="@+id/textlablekeytype"
                app:layout_constraintTop_toTopOf="@+id/textlablekeytype" />

            <TextView
                android:id="@+id/textlableahostkey"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:text="连接密码:"
                android:textSize="16sp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/textlablekeytype" />

            <EditText
                android:id="@+id/Edittextkey"
                android:layout_width="330dp"
                android:layout_height="wrap_content"
                android:textSize="16sp"
                android:gravity="left"
                android:text=""
                android:inputType="textPassword"
                app:layout_constraintBottom_toBottomOf="@+id/textlableahostkey"
                app:layout_constraintLeft_toRightOf="@+id/textlableahostkey"
                app:layout_constraintTop_toTopOf="@+id/textlableahostkey" />

            <Button
                android:id="@+id/butt_Writewifitag"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginTop="10dp"
                android:onClick="writewifitag"
                android:text="将以上WIFI连接信息写入标签"
                android:textSize="14sp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/textlableahostkey" />

        </androidx.constraintlayout.widget.ConstraintLayout>

    </ScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>