显示偏好摘要

heyblood · Jan 27, 2021 · e2bc642 · e2bc642
1 parent caea551
commit e2bc642
Showing 1 changed file with 22 additions and 1 deletion.
diff --git a/app/src/main/java/com/example/quakereport/SettingsActivity.java b/app/src/main/java/com/example/quakereport/SettingsActivity.java
@@ -1,7 +1,10 @@
 package com.example.quakereport;
 
+import android.content.SharedPreferences;
 import android.os.Bundle;
+import android.preference.Preference;
 import android.preference.PreferenceFragment;
+import android.preference.PreferenceManager;
 
 import androidx.appcompat.app.AppCompatActivity;
 
@@ -13,11 +16,29 @@ protected void onCreate(Bundle savedInstanceState) {
         setContentView(R.layout.activity_settings);
     }
 
-    public static class EarthquakePreferenceFragment extends PreferenceFragment {
+    public static class EarthquakePreferenceFragment extends PreferenceFragment implements Preference.OnPreferenceChangeListener {
         @Override
         public void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
             addPreferencesFromResource(R.xml.settings_main);
+
+            // 在偏好设置中显示偏好的摘要，而无需点击后查看
+            Preference minMagnitude = findPreference(getString(R.string.settings_min_magnitude_key));
+            bindPreferenceSummaryToValue(minMagnitude);
+        }
+
+        private void bindPreferenceSummaryToValue(Preference preference) {
+            preference.setOnPreferenceChangeListener(this);
+            SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(preference.getContext());
+            String preferenceString = preferences.getString(preference.getKey(), "");
+            onPreferenceChange(preference, preferenceString);
+        }
+
+        @Override
+        public boolean onPreferenceChange(Preference preference, Object newValue) {
+            String stringValue = newValue.toString();
+            preference.setSummary(stringValue);
+            return true;
         }
     }
 }