我在我的主要活动（称为记分板活动）中定义了一些 SharedPreferences。这些值肯定会被检索到，或者正确的默认值正在工作。但是，我现在尝试设置一个SettingsActivity屏幕，以便用户可以更改这些值，但它不能正常工作。当新 Activity 打开时，值不会加载到 XML 布局中的字段中。
（如您所知，我对此很陌生，所以请善待）
这是与共享首选项相关的ScoreboardActivity代码（有效）：
// get the preferences
prefs = getPreferences(MODE_PRIVATE);
// Load the values or defaults from the SharedPreferences
msMainClockStart = prefs.getLong( "Default_Main_Clock", 480000); // 8 minute default
useShotClock = prefs.getBoolean( "Use_ShotClock", false );
msShotClockStart = prefs.getLong( "Default_Shot_Clock", 24000); // 24 second default
tvPeriodPrefix = prefs.getString( "Period_Prefix", getResources().getString(R.string.period) );
valMaxPeriods = prefs.getInt( "Max_Periods", 4);
Here is my code when the menu button is pressed and Settings is clicked on (I think this is wrong but the settings.xml page does open:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
setContentView(R.layout.settings);
return super.onOptionsItemSelected(item);
}
这是我的设置活动：
package com.example.ultimatescoreclock;
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.EditText;
public class SettingsActivity extends Activity {
ScoreboardActivity scoreboard = new ScoreboardActivity();
SharedPreferences settings = scoreboard.prefs;
@Override
protected void onCreate(Bundle savedInstanceState) {
EditText
strMainMinutes,
strShotSeconds,
strPeriodPrefix,
strMaxPeriods;
CheckBox
cbUseShotClock;
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
// Load the values or defaults from the SharedPreferences
scoreboard.msMainClockStart = settings.getLong( "Default_Main_Clock", 480000); // 8 minute default
scoreboard.useShotClock = settings.getBoolean( "Use_ShotClock", true );
scoreboard.msShotClockStart = settings.getLong( "Default_Shot_Clock", 24000); // 24 second default
scoreboard.tvPeriodPrefix = settings.getString( "Period_Prefix", getResources().getString(R.string.period) );
scoreboard.valMaxPeriods = settings.getInt( "Max_Periods", 4);
strMainMinutes = (EditText) findViewById(R.id.numMainMinutes);
cbUseShotClock = (CheckBox) findViewById(R.id.cbUseShotClock);
strShotSeconds = (EditText) findViewById(R.id.numShotSeconds);
strPeriodPrefix = (EditText) findViewById(R.id.periodPrefix);
strMaxPeriods = (EditText) findViewById(R.id.periodMax);
strMainMinutes.setText( Long.toString(scoreboard.msMainClockStart / 1000) );
cbUseShotClock.setChecked( scoreboard.useShotClock );
strShotSeconds.setText( Long.toString(scoreboard.msShotClockStart / 1000) );
strPeriodPrefix.setText( scoreboard.tvPeriodPrefix );
strMaxPeriods.setText( Integer.toString(scoreboard.valMaxPeriods) );
}
}
这是我的 XML 布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/lblMainClock"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Main Clock Default (mins)" />
<EditText
android:id="@+id/numMainMinutes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="number"
android:minEms="4" />
<CheckBox
android:id="@+id/cbUseShotClock"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical|start"
android:text="Use Shot Clock" />
<TextView
android:id="@+id/lblShotClock"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Shot Clock Default (secs)" />
<EditText
android:id="@+id/numShotSeconds"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="number"
android:minEms="4" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/lblPeriodPrefix"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Period Prefix (e.g. Q, Shift, etc)" />
<EditText
android:id="@+id/periodPrefix"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10" />
<TextView
android:id="@+id/lblMaxPeriods"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Maximum Number of Periods" />
<EditText
android:id="@+id/periodMax"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:minEms="4" />