当您编写网络代码时（在本例中，使用 volley），您的代码不会按顺序执行。也就是说，当您进行网络呼叫时，响应可能会在 2 秒之后出现。所以这些代码是异步的。在这些情况下，我们使用回调。
我认为您正在尝试做这样的事情：
boolean result = getNetworkResult(); // suppose, your code is inside getNetworkResult() method
if(result == true) {
Log.e(TAG, "Do something on success");
}else{
Log.e(TAG, "Do something on failure");
}
由于您给定的代码是异步的，它不会以这种方式工作。这就是我们使用回调/监听器的原因。因此，您的代码将如下所示：
final JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, key, null,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
//here I obtain the json object and based on it I want to make the boolean false or true
// just simply write your logic inside here
boolean result; // your conditions
if(result == true) {
Log.e(TAG, "Do something on success"); // <----- Look here
}else{
Log.e(TAG, "Do something on failure"); // <----- Look here
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (error.networkResponse.statusCode == 404) {
....
}
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
}
@Override
protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
};
mRequestQueue.add(request);
// return boolean; // <-- this won't work, so I am commenting it out
}
现在，如果您真的想编写“看起来”像顺序的代码（但实际上它实际上是异步的），那么您可以尝试 kotlin 协程。我找到了这个stackoverflow answer，它展示了如何将协程与 volley 一起使用。请检查一下。
编辑
根据您的评论，我认为您应该以这种方式编写代码：
假设您有 2 个活动：MainActivity 和 DetailsActivity。不要在MainActivity 中保留布尔变量，而是尝试将布尔值传递给DetailsActivity。
所以代码可以是这样的：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, key, null,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
// the new logic
if(response.toString().contains("farewall to arms")) {
// open new activity
Intent intent = new Intent(this, DetailsActivity.class);
intent.putExtra("YOUR_BOOLEAN_VALUE", true); // Here we are passing the boolean result
intent.putExtra("SOME_STRING", response.toString());
// pass more variables that you need...
startActivityForResult(intent, 8080);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (error.networkResponse.statusCode == 404) {
....
}
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
}
@Override
protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
};
mRequestQueue.add(request);
// return boolean; // <-- this won't work, so I am commenting it out
}
}
}
现在在DetailsActivity:
class DetailsActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Boolean yourBool = getIntent().getExtras().getBoolean("YOUR_BOOLEAN_VALUE");
String yourResponse = getIntent().getExtras().getString("SOME_STRING");
// now inside your for loop
for(int i=0; i<10; i++) {
if(yourBool == true) { break;}
}
}
}