Question

我目前有一个偏好设置屏幕，我创建了一个扩展DialogPreference的自定义类，并在我的偏好设置中调用。我的偏好设置数据似乎从SharedPreferences存储/检索没有问题，但我正在尝试从DialogPreference添加另外两组设置。

基本上我有两个我无法找到的问题。我见过的每个网站都给了我相同的标准信息来保存/恢复数据，我仍然遇到问题。首先，我正在尝试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()中执行此操作。

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“对于AccDialog类型，方法getDefaultSharedPreferences（AccDialog）是未定义的”。我试图将上下文更改为我的首选项类，使用空白上下文，我也尝试命名我的SharedPrefs并使用getSharedPreferences()。我只是不确定我在这做什么。

由于我对Java / Android /编码一般都很陌生，如果有任何帮助，请尽可能详细说明，例如。我需要写哪些文件来编写代码和该文件中的行踪（即onCreate()，onClick()等）

Answer 1

在执行此行之前返回的onCreate()中，Eclipse说它无法访问。在onClick()尝试：

SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(mContext);

应该没问题

Answer 2

SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(mContext);

从自定义DialogPreference保存到SharedPreferences

2 个答案: