[英]Call a method when click on preference header Android
I would like to call a method to clear cache when i click on a specific header in my preference screen in Android. 当我点击Android中偏好设置屏幕中的特定标题时,我想调用一种清除缓存的方法。
The problem is that onSharedPreferenceChanged is never called : 问题是永远不会调用onSharedPreferenceChanged:
Here is the piece of code of my preferences.xml : 这是我的preferences.xml的代码片段:
<header android:icon="@drawable/ic_action_cancel"
android:title="Vider le cache d'articles"
android:key="clearCache"
android:summary="Clear all datas.">
</header>
And, here is the code of my settingActivity : 而且,这是我的settingActivity的代码:
package com.rss.preferences;
import java.io.File;
import java.util.List;
import com.rss.R;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.Gravity;
import android.widget.TextView;
public class SettingsFragment extends PreferenceActivity {
SharedPreferences settings;
public static final String KEY_CLEAR_CACHE = "clearCache";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Add a button to the header list.
if (hasHeaders()) {
TextView txt = new TextView(this);
txt.setText("Version 1.0 Beta");
txt.setGravity(Gravity.CENTER);
setListFooter(txt);
}
settings = getSharedPreferences("clearCache", 0);
settings.registerOnSharedPreferenceChangeListener(new SharedPreferences.OnSharedPreferenceChangeListener() {
@Override
public void onSharedPreferenceChanged (SharedPreferences sharedPreferences, String key) {
Log.d("INFO", "popopo");
}
});
}
public void onBuildHeaders(List<Header> target) {
loadHeadersFromResource(R.xml.preferences, target);
}
// public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
// if (key.equals(KEY_CLEAR_CACHE)) {
// clearApplicationData();
// }
// }
public void clearApplicationData() {
File cache = getCacheDir();
File appDir = new File(cache.getParent());
if (appDir.exists()) {
String[] children = appDir.list();
for (String s : children) {
if (!s.equals("lib")) {
deleteDir(new File(appDir, s));
Log.i("TAG", "**************** File /data/data/APP_PACKAGE/" + s + " DELETED *******************");
}
}
}
}
public static boolean deleteDir(File dir) {
if (dir != null && dir.isDirectory()) {
String[] children = dir.list();
for (int i = 0; i < children.length; i++) {
boolean success = deleteDir(new File(dir, children[i]));
if (!success) {
return false;
}
}
}
return dir.delete();
}
}
You don't need OnSharedPreferenceChangeListener in this case. 在这种情况下,您不需要OnSharedPreferenceChangeListener。 What you need is to override onHeaderClick method in your PreferenceActivity. 您需要的是覆盖PreferenceActivity中的onHeaderClick方法。
@Override
public void onHeaderClick(Header header, int position) {
super.onHeaderClick(header, position);
if (header.id == R.id.clear_cache) {
clearApplicationData();
}
}
Of course you have to add an id to header in xml. 当然,您必须在xml中为标头添加一个id。
<header android:id="@+id/clear_cache"
android:icon="@drawable/ic_action_cancel"
android:title="Vider le cache d'articles"
android:key="clearCache"
android:summary="Clear all datas.">
</header>
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