Java 从OnClickListener引发异常

我对java有点陌生，我在这里尝试做的是每次按下按钮时发送Post请求。这是我的密码

   public class Remotetask extends AppCompatActivity {

    TextView tv;
    Button btn;

    public void PostRequest(String url_from_text) throws IOException {
        String url = url_from_text;
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        con.setRequestMethod("GET");
        con.setRequestProperty("User-Agent", "Mozilla/5.0");
        int responseCode = con.getResponseCode();
        BufferedReader in = new BufferedReader(
                new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();
        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
        //print in String
        tv.setText(response.toString());
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_eve_aioremote);
        btn = (Button) findViewById(R.id.Button1);
        tv = (TextView) findViewById(R.id.textView);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) throws IOException{
                PostRequest("api endpoint");
            }
        });
    }
}

这条线在这里

公共void onClick（视图v）引发IOException

这里给出了一个错误：

错误：中的onClick（视图）无法在OnClickListener中实现onClick（视图） 重写的方法不会引发IOException

---

我在另一篇帖子中发现一个家伙问了一个类似的问题，但答案真的帮不了我，因为我对这个问题有点陌生。多谢各位

从onclick中删除IOException抛出。像这样

@Override
public void onClick(View v) {
  try {
    PostRequest("api endpoint");
   } catch (IOException e){
        e.printStackTrace();
    }
}

---

onClickListener的原始方法不会抛出任何异常，这就是它给出错误的原因。

从onclick中删除IOException抛出。像这样

@Override
public void onClick(View v) {
  try {
    PostRequest("api endpoint");
   } catch (IOException e){
        e.printStackTrace();
    }
}

---

onClickListener的原始方法不会引发任何异常，这就是它给出错误的原因。

引发IOException请不要在Onclick中引发此异常，因为您已经在PostRequest方法中引发异常

试试这个：

 btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v){
        PostRequest("api endpoint");
    }
});

---

抛出IOException请不要在Onclick中抛出此异常，因为您已经在PostRequest方法中抛出异常

试试这个：

 btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v){
        PostRequest("api endpoint");
    }
});

---

实现try-catch而不是抛出IOException

 public class Remotetask extends AppCompatActivity {

 TextView tv;
 Button btn;

 public void PostRequest(String url_from_text) {
 try{
String url = url_from_text;
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
con.setRequestMethod("GET");
con.setRequestProperty("User-Agent", "Mozilla/5.0");
int responseCode = con.getResponseCode();
BufferedReader in = new BufferedReader(
        new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
    response.append(inputLine);
}
in.close();
//print in String
tv.setText(response.toString());
}catch(Exception e)
{
e.printStackTrace();
}
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_eve_aioremote);
btn = (Button) findViewById(R.id.Button1);
tv = (TextView) findViewById(R.id.textView);

btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v){
        PostRequest("api endpoint");
    }
});

---

}实现try-catch而不是抛出IOException

 public class Remotetask extends AppCompatActivity {

 TextView tv;
 Button btn;

 public void PostRequest(String url_from_text) {
 try{
String url = url_from_text;
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
con.setRequestMethod("GET");
con.setRequestProperty("User-Agent", "Mozilla/5.0");
int responseCode = con.getResponseCode();
BufferedReader in = new BufferedReader(
        new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
    response.append(inputLine);
}
in.close();
//print in String
tv.setText(response.toString());
}catch(Exception e)
{
e.printStackTrace();
}
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_eve_aioremote);
btn = (Button) findViewById(R.id.Button1);
tv = (TextView) findViewById(R.id.textView);

btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v){
        PostRequest("api endpoint");
    }
});

}像这样处理错误

btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
    try {
        PostRequest("api endpoint");
    } catch (Exception e)‏ {
        //error handling code
    }

}
});

像这样处理错误

btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
    try {
        PostRequest("api endpoint");
    } catch (Exception e)‏ {
        //error handling code
    }

}
});

---

尝试此代码段。请从OnClick

  public class Remotetask extends AppCompatActivity {

    TextView tv;
    Button btn;

    public void PostRequest(String url_from_text) throws IOException {
        String url = url_from_text;
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        con.setRequestMethod("GET");
        con.setRequestProperty("User-Agent", "Mozilla/5.0");
        int responseCode = con.getResponseCode();
        BufferedReader in = new BufferedReader(
                new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();
        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
        //print in String
        tv.setText(response.toString());
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_eve_aioremote);
        btn = (Button) findViewById(R.id.Button1);
        tv = (TextView) findViewById(R.id.textView);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{
                PostRequest("api endpoint");
                } catch (Exception e)
                  {
                   e.getStackTrace();
                  }
            }
        });
    }
}

---

希望这可以帮助您

尝试此代码段。请从OnClick中删除throwIOException

  public class Remotetask extends AppCompatActivity {

    TextView tv;
    Button btn;

    public void PostRequest(String url_from_text) throws IOException {
        String url = url_from_text;
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        con.setRequestMethod("GET");
        con.setRequestProperty("User-Agent", "Mozilla/5.0");
        int responseCode = con.getResponseCode();
        BufferedReader in = new BufferedReader(
                new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();
        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
        //print in String
        tv.setText(response.toString());
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_eve_aioremote);
        btn = (Button) findViewById(R.id.Button1);
        tv = (TextView) findViewById(R.id.textView);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{
                PostRequest("api endpoint");
                } catch (Exception e)
                  {
                   e.getStackTrace();
                  }
            }
        });
    }
}

---

希望这可以帮助您

抛出runtimeexeption而不是选中的异常，或直接在OnClick方法中处理异常我建议您使用volley或改装库而不是手动代码抛出runtimeexeption而不是选中的异常，或直接在OnClick方法中处理异常我建议您使用volley或改装库这是我尝试的第一件事，而不是手动编写代码，但如果我这样做，我会得到“错误：未报告的异常IOException；必须捕获或声明为抛出”行“PostRequest（“api端点”）；”。非常感谢你的快速回复。好的，明白了！感谢您的快速解决方案！这是我尝试的第一件事，但如果我这样做，我会得到“错误：未报告的异常IOException；必须捕获或声明为抛出”这一行“PostRequest（“api端点”）；”。非常感谢你的快速回复。好的，明白了！感谢您的快速解决方案！是的！知道了！非常感谢。是的！知道了！非常感谢。