我目前有一个首选项屏幕，并且我创建了一个自定义类，该类扩展DialogPreference并从我的首选项中调用。SharedPreferences我的首选项数据似乎可以毫无问题地存储/检索，但我正在尝试从DialogPreference.
基本上我有两个我无法找到的问题。我见过的每个站点都为我提供了相同的标准信息来保存/恢复数据，但我仍然遇到问题。首先，我试图将用户名和密码保存到我的SharedPreferences（在最后一段代码中可见），如果可能的话，我希望能够在onClick().
我的偏好 XML 调用我的DialogPreference：
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory>
<com.rone.optusmon.AccDialog
android:key="AccSettings"
android:title="Account Settings"
android:negativeButtonText="Cancel"
android:positiveButtonText="Save" />
</PreferenceCategory>
</PreferenceScreen>
我的自定义 DialogPreference 类文件：
package com.rone.optusmon;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.preference.DialogPreference;
import android.preference.PreferenceManager;
import android.text.method.PasswordTransformationMethod;
import android.util.AttributeSet;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class AccDialog extends DialogPreference implements DialogInterface.OnClickListener {
private TextView mUsername, mPassword;
private EditText mUserbox, mPassbox;
CharSequence mPassboxdata, mUserboxdata;
private CheckBox mShowchar;
private Context mContext;
private int mWhichButtonClicked;
public AccDialog(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
}
@Override
protected View onCreateDialogView() {
// Access default SharedPreferences
@SuppressWarnings("unused")
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(mContext);
@SuppressWarnings("unused")
LinearLayout.LayoutParams params;
LinearLayout layout = new LinearLayout(mContext);
layout.setOrientation(LinearLayout.VERTICAL);
layout.setPadding(10, 10, 10, 10);
layout.setBackgroundColor(0xFF000000);
mUsername = new TextView(mContext);
mUsername.setText("Username:");
mUsername.setTextColor(0xFFFFFFFF);
mUsername.setPadding(0, 8, 0, 3);
mUserbox = new EditText(mContext);
mUserbox.setSingleLine(true);
mUserbox.setSelectAllOnFocus(true);
mPassword = new TextView(mContext);
mPassword.setText("Password:");
mPassword.setTextColor(0xFFFFFFFF);
mPassbox = new EditText(mContext);
mPassbox.setSingleLine(true);
mPassbox.setSelectAllOnFocus(true);
mShowchar = new CheckBox(mContext);
mShowchar.setOnCheckedChangeListener(mShowchar_listener);
mShowchar.setText("Show Characters");
mShowchar.setTextColor(0xFFFFFFFF);
mShowchar.setChecked(false);
if(!mShowchar.isChecked()) {
mPassbox.setTransformationMethod(new PasswordTransformationMethod());
}
layout.addView(mUsername);
layout.addView(mUserbox);
layout.addView(mPassword);
layout.addView(mPassbox);
layout.addView(mShowchar);
return layout;
}
public void onClick(DialogInterface dialog, int which) {
mWhichButtonClicked = which;
// if statement to set save/cancel button roles
if (mWhichButtonClicked == -1) {
Toast.makeText(mContext, "Save was clicked\nUsername: " + mUserbox.getText().toString() +"\nPassword is: " + mPassbox.getText().toString(), Toast.LENGTH_SHORT).show();
// Save user preferences
SharedPreferences settings = getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = settings.edit();
editor.putString("usernamekey", mUserbox.getText().toString());
editor.putString("passwordkey", mPassbox.getText().toString());
editor.commit();
}
else {
Toast.makeText(mContext, "Cancel was clicked", Toast.LENGTH_SHORT).show();
}
}
}
我的主要活动测试代码：
public void onResume() {
super.onResume();
SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);
StringBuilder builder = new StringBuilder();
builder.append("\nThe monitor will refresh every "+ pref.getString("refreshfreq", "30 minutes"));
builder.append("\nThe skin chosen is "+ pref.getString("skinkey", "null"));
builder.append("\nThe style chosen is "+ pref.getString("stylekey", "% used"));
builder.append("\nThe font chosen is "+ pref.getString("fontkey", "Calibri"));
builder.append("\nThe font color is "+ pref.getString("fontcolkey", "White"));
builder.append("\nYour username is "+ pref.getString("usernamekey", "not set yet"));
builder.append("\nYour password is "+ pref.getString("passwordkey", "not set yet"));
Toast.makeText(Optusmon.this, builder.toString(), Toast.LENGTH_LONG).show();
}
在我的SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);行中，Eclipse 说“方法 getDefaultSharedPreferences(AccDialog) 未定义 AccDialog 类型”。我尝试将上下文更改为我的首选项类，使用空白上下文，我还尝试命名我的 SharedPrefs 并使用getSharedPreferences()。我只是不确定我在这里做什么。
由于我对 Java/Android/编码很陌生，请您尽可能详细地提供任何帮助，例如。我需要在哪些文件中写入代码以及我应该在该文件中写入的位置（即onCreate()，onClick()等）