如何解决如何在android中发送从一个活动调用到另一个活动的截击POST请求的响应
要求: 在 Android 应用程序代码中,在 MainActivity 中,我想通过 Volley 调用 REST POST API,然后在下一个 Activity 中传递 JSON 响应。但是通过的响应是空白的。代码是:
请注意
System.out.println(globalOutput); //这不会打印任何东西
public class MainActivity extends AppCompatActivity {
public static final String LOGIN_RESULT = "com.example.awgpusers2.loginResult";
static String globalOutput;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void login(View view) throws Exception {
EditText emailEditText = findViewById(R.id.editTextTextEmailAddress2);
EditText phoneEditText = findViewById(R.id.editTextPhone2);
EditText passwordEditText = findViewById(R.id.editTextTextPassword);
String emailAddress = emailEditText.getText().toString();
String phone = phoneEditText.getText().toString();
String password = passwordEditText.getText().toString();
makePostCall(emailAddress,phone,password,new VolleyCallback() {
@Override
public void onSuccess(String result) {
System.out.println("result " + result);
globalOutput = result;
System.out.println("globalOutput " + globalOutput);
}
});
System.out.println(globalOutput); //THIS DOESN'T PRINT ANYTHING
Intent intent = new Intent(this,LoginNextActivity.class);
intent.putExtra(LOGIN_RESULT,globalOutput);
startActivity(intent);
}
void makePostCall(String emailAddress,String phone,String password,final VolleyCallback callback) throws Exception {
//String globalOutput;
String postUrl = "http://18.188.180.148:8080/auth/login";
RequestQueue requestQueue = Volley.newRequestQueue(this);
JSONObject postData = new JSONObject();
try {
postData.put("email",emailAddress);
postData.put("password",password);
postData.put("phoneNumber",phone);
} catch (JSONException e) {
e.printstacktrace();
}
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST,postUrl,postData,new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
callback.onSuccess(response.toString());
}
},new Response.ErrorListener() {
........................
});
requestQueue.add(jsonObjectRequest);
}
}
请帮忙
解决方法
您的 System.out.println
在 Volley 返回响应之前执行。 Volley 的 enqueue
方法是异步的,即您无法准确判断它何时执行。
移动
System.out.println(globalOutput); //THIS DOESN'T PRINT ANYTHING
Intent intent = new Intent(this,LoginNextActivity.class);
intent.putExtra(LOGIN_RESULT,globalOutput);
startActivity(intent);
进入 VolleyCallback 的 onSuccess
方法
makePostCall() 方法是异步函数。 所以需要在回调函数中处理。
public void login(View view) throws Exception {
EditText emailEditText = findViewById(R.id.editTextTextEmailAddress2);
EditText phoneEditText = findViewById(R.id.editTextPhone2);
EditText passwordEditText = findViewById(R.id.editTextTextPassword);
String emailAddress = emailEditText.getText().toString();
String phone = phoneEditText.getText().toString();
String password = passwordEditText.getText().toString();
makePostCall(emailAddress,phone,password,new VolleyCallback() {
@Override
public void onSuccess(String result) {
System.out.println("result " + result);
globalOutput = result;
System.out.println("globalOutput " + globalOutput);
System.out.println(globalOutput); //THIS DOESN'T PRINT ANYTHING
runOnUiThread(new Runnable() {
@Override
public void run() {
Intent intent = new Intent(MainActivity.this,LoginNextActivity.class);
intent.putExtra(LOGIN_RESULT,globalOutput);
startActivity(intent);
}
});
}
});
}
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