练习：修复应用

heyblood · Jan 24, 2021 · 46d6463 · 46d6463
1 parent 0f1fc16
commit 46d6463
Showing 1 changed file with 18 additions and 4 deletions.
diff --git a/app/src/main/java/com/example/didyoufeelit/MainActivity.java b/app/src/main/java/com/example/didyoufeelit/MainActivity.java
@@ -15,6 +15,7 @@
  */
 package com.example.didyoufeelit;
 
+import android.os.AsyncTask;
 import android.os.Bundle;
 import android.widget.TextView;
 
@@ -37,11 +38,9 @@ protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
-        // Perform the HTTP request for earthquake data and process the response.
-        Event earthquake = Utils.fetchEarthquakeData(USGS_REQUEST_URL);
+        EarthquakeAsyncTask task = new EarthquakeAsyncTask();
+        task.execute(USGS_REQUEST_URL);
 
-        // Update the information displayed to the user.
-        updateUi(earthquake);
     }
 
     /**
@@ -58,4 +57,19 @@ private void updateUi(Event earthquake) {
         magnitudeTextView.setText(earthquake.perceivedStrength);
     }
 
+    private class EarthquakeAsyncTask extends AsyncTask<String, Void, Event> {
+        @Override
+        protected Event doInBackground(String... urls) {
+            // Perform the HTTP request for earthquake data and process the response.
+            Event earthquake = Utils.fetchEarthquakeData(USGS_REQUEST_URL);
+            return earthquake;
+        }
+
+        @Override
+        protected void onPostExecute(Event result) {
+            // Update the information displayed to the user.
+            updateUi(result);
+        }
+    }
+
 }