convertBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String text2 = editText2.getText().toString(); String apiUrl = "https://yurl6.cn/user/api.php"; String curl = "curl=" + text2; OkHttpClient client = new OkHttpClient(); MediaType mediaType = MediaType.parse("application/json"); RequestBody requestBody = RequestBody.create(mediaType, "{\"curl\":\"" + curl + "\"}"); Request request = new Request.Builder() .url(apiUrl) .post(requestBody) .build(); try { Response response = client.newCall(request).execute(); String result = response.body().string(); JSONObject jsonObject = new JSONObject(result); String shortUrl = jsonObject.getString("shortUrl"); editText3.setText(shortUrl); } catch (IOException e) { e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } } }); } 在点击按钮后，app闪退

闪退可能是由于一些异常情况引起的，例如网络连接异常或JSON解析错误等。你可以在捕获异常的代码块中打印出异常信息来调试代码。请尝试以下修改，看看是否能够解决问题：

convertBtn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        String text2 = editText2.getText().toString();
        String apiUrl = "https://yurl6.cn/user/api.php";
        String curl = "curl=" + text2;
        OkHttpClient client = new OkHttpClient();
        MediaType mediaType = MediaType.parse("application/json");
        RequestBody requestBody = RequestBody.create(mediaType, "{\"curl\":\"" + curl + "\"}");
        Request request = new Request.Builder()
                .url(apiUrl)
                .post(requestBody)
                .build();
        try {
            Response response = client.newCall(request).execute();
            String result = response.body().string();
            JSONObject jsonObject = new JSONObject(result);
            String shortUrl = jsonObject.getString("shortUrl");
            editText3.setText(shortUrl);
        } catch (IOException | JSONException e) {
            e.printStackTrace();
        }
    }
});

同时，请确保你已经在Manifest.xml中声明了网络权限：

<uses-permission android:name="android.permission.INTERNET" />