我目前有一个首选项屏幕，我创建了一个自定义类，它扩展了 DialogPreference 并从我的首选项中调用。我的偏好数据似乎从 SharedPreferences 存储/检索没有问题，但我正在尝试从 DialogPreference 添加另外 2 组设置。

基本上我有两个问题我没能找到。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( )。

调用我的 DialogPreference 的我的首选项 XML:

<?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 Activity 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) 未定义类型 AccDialog”。我试图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() 。我只是不确定我到底在做什么。

一般来说，我对 Java/Android/编码还很陌生，能否请您提供尽可能详细的帮助，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代码的位置(即 onCreate()、onClick() 等)

最佳答案

在执行此行之前返回的 onCreate() 中，因此 Eclipse 表示它无法访问。 在你的 onClick() 尝试:

SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(mContext); 

应该没问题

关于java - 从自定义 DialogPreference 保存到 SharedPreferences，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/4703996/