效果演示:
实现步骤
一、布局页面activity_inet_address.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
android:padding="5dp"
tools:context=".InetAddressActivity">
<EditText
android:id="@+id/edit_address"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="@drawable/edit_style"
android:text="www.163.com" />
<Button
android:id="@+id/btn_hostName_check"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="5dp"
android:text="检查主机名"
android:textColor="@color/black"
android:textSize="20sp" />
<TextView
android:id="@+id/tv_desc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@color/black"
android:textSize="15sp" />
</LinearLayout>
二、InetAddressActivity类,实现根据用户输入的主机名,检查是否可以连接,并且显示主机名,和ip地址,代码中已经给出了详细的注释。
public class InetAddressActivity extends AppCompatActivity implements View.OnClickListener {
private EditText edit_address;
private TextView tv_desc;
private Button btn_hostName_check;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_inet_address);
edit_address = findViewById(R.id.edit_address);
tv_desc = findViewById(R.id.tv_desc);
btn_hostName_check = findViewById(R.id.btn_hostName_check);
btn_hostName_check.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_hostName_check:
String hostName = edit_address.getText().toString();
//开启子线程 检查主机名
new CheckThread(hostName).start();
break;
default:
break;
}
}
//创建一个检查结果的接收器Handler
private Handler handler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(@NonNull Message msg) {
tv_desc.setText("主机检查结果如下:\n" + msg.obj);
return true;
}
});
private class CheckThread extends Thread {
private String hostName;
public CheckThread(@NonNull String name) {
hostName = name;
}
@Override
public void run() {
//获得一个默认消息对象
Message message = Message.obtain();
try {
//根据主机名获取主机名称对象
InetAddress inetAddress = InetAddress.getByName(hostName);
//检查该主机在规定时间内能否连上
boolean isReachable = inetAddress.isReachable(5000);
String desc = (isReachable) ? "可以连接" : "无法连接";
if (isReachable) {
desc = String.format("%s\n主机名为:%s\n主机地址为:%s", desc,
inetAddress.getHostName(), inetAddress.getHostAddress());
message.what = 0; //消息类型
message.obj = desc;//消息描述
}
} catch (Exception e) {
e.printStackTrace();
message.what = -1; //消息类型
message.obj = e.getMessage(); //消息描述
}
// 向接收处理器发送检查结果消息
handler.sendMessage(message);
}
}
}