我已经能够将一个条目保存到共享首选项,并且能够在另一个视图的列表视图中显示,但我希望添加多个条目并将它们也显示在列表视图中。我以为我有正确的代码,但它没有看到任何改变。我的意图是收藏夹列表,我从一个视图中获取条目数据并在另一个视图中显示它。如何将字符串集保存到共享首选项
SingleView活动:
SharedPreferences.Editor fd;
SharedPreferences FeedPref;
private ArrayList<String> addArray = new ArrayList<>();
txt = (TextView) findViewById(R.id.name);
add = (Button) findViewById(R.id.btnAdd);
FeedPref = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
fd = FeedPref.edit();
add.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String message = txt.getText().toString();
if (addArray.contains(message)) {
Toast.makeText((getBaseContext()), "Plant Already Added", Toast.LENGTH_LONG).show();
} else {
addArray.add(message);
FeedPref = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
fd = FeedPref.edit();
fd.putInt("array_size", addArray.size());
for (int i = 0; i < addArray.size(); i++) {
fd.putString("Status_" + i, addArray.get(i));
}
fd.commit();
Toast.makeText((getBaseContext()), "Plant Added", Toast.LENGTH_LONG).show();
}
}
});
}
mygarden活性:
public class mygardenMain extends Activity {
//String[] presidents;
ListView listView;
//ArrayAdapter<String> adapter;
SharedPreferences FeedPref;
SharedPreferences.Editor fd;
//private ArrayList<String> addArray;
//public static final String PREFS = "examplePrefs";
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mygarden_list);
listView = (ListView) findViewById(R.id.mygardenlist);
//addArray = new ArrayList<>();
FeedPref = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
int size = FeedPref.getInt("array_size", 0);
for (int i = 0; i < size; i++) {
String mess = FeedPref.getString("Status_" + i, null);
String[] values = new String[]{mess};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, values);
listView.setAdapter(adapter);
}
}
fd.commit();只要你把字符串,就会被调用。而这并不是理想的做法。 –
为什么不保存一个集合,我认为它会更清晰,看看这篇文章:http://stackoverflow.com/questions/7057845/save-arraylist-to-sharedpreferences,比onclick事件,你应该得到从共享偏好设置,添加新项目并保存。 – fdam
这是我用来从我到达今天的代码的线程。 – user4682589