自定义首选项，targetSdkVersion=“11":缺少缩进? [英] Custom preference, targetSdkVersion="11": missing indent?

问题描述

我有几个自定义的 DialogPreference 实现，例如 以及一个演示问题的简单首选项 XML 文件.即使只有两个 Java 类、首选项 XML 和一个 arrays.xml 文件，我也会遇到这种现象.这是来自该项目的编译 APK.

解决方案

(交叉发帖自 关联的安卓开发者线程)

好的，我想通了.

Preference 有三种可能的构造函数:

MyPreference(Context ctxt)MyPreference(上下文 ctxt，AttributeSet attrs)MyPreference(上下文 ctxt，AttributeSet attrs，int defStyle)

沿着这条线的某个地方，我找到了拥有一参数构造函数链到二参数构造函数(为第二个参数传递 null)，并具有两个参数构造函数链到三参数构造函数(为第三个参数).

这不是正确的答案.

我希望正确的答案是只实施第二个构造函数，因为正确的默认样式是 Android 内部的(com.android.internal.R.attr.dialogPreferenceStyle).第二构造函数是用于膨胀首选项 XML 的构造函数.

感谢大家的帮助！

I have a couple of custom DialogPreference implementations floating around, such as this one:

package apt.tutorial;

import android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.TimePicker;

public class TimePreference extends DialogPreference {
    private int lastHour=0;
    private int lastMinute=0;
    private TimePicker picker=null;

    public static int getHour(String time) {
        String[] pieces=time.split(":");

        return(Integer.parseInt(pieces[0]));
    }

    public static int getMinute(String time) {
        String[] pieces=time.split(":");

        return(Integer.parseInt(pieces[1]));
    }

    public TimePreference(Context ctxt) {
        this(ctxt, null);
    }

    public TimePreference(Context ctxt, AttributeSet attrs) {
        this(ctxt, attrs, 0);
    }

    public TimePreference(Context ctxt, AttributeSet attrs, int defStyle) {
        super(ctxt, attrs, defStyle);

        setPositiveButtonText("Set");
        setNegativeButtonText("Cancel");
    }

    @Override
    protected View onCreateDialogView() {
        picker=new TimePicker(getContext());

        return(picker);
    }

    @Override
    protected void onBindDialogView(View v) {
        super.onBindDialogView(v);

        picker.setCurrentHour(lastHour);
        picker.setCurrentMinute(lastMinute);
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
        super.onDialogClosed(positiveResult);

        if (positiveResult) {
            lastHour=picker.getCurrentHour();
            lastMinute=picker.getCurrentMinute();

            String time=String.valueOf(lastHour)+":"+String.valueOf(lastMinute);

            if (callChangeListener(time)) {
                persistString(time);
            }
        }
    }

    @Override
    protected Object onGetDefaultValue(TypedArray a, int index) {
        return(a.getString(index));
    }

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
        String time=null;

        if (restoreValue) {
            if (defaultValue==null) {
                time=getPersistedString("00:00");
            }
            else {
                time=getPersistedString(defaultValue.toString());
            }
        }
        else {
            time=defaultValue.toString();
        }

        lastHour=getHour(time);
        lastMinute=getMinute(time);
    }
}

They work just fine. However, in an application with android:targetSdkVersion="11" defined, on a XOOM, they show up missing the indent when in the PreferenceActivity:

Also, the font size appears a smidge bigger, at least for the title.

There's nothing in DialogPreference where I am really overriding any formatting behavior for that stuff, AFAIK. The preference XML is unremarkable, other than referring to the above class:

<PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android">
    <ListPreference
        android:key="sort_order"
        android:title="Sort Order"
        android:summary="Choose the order the list uses"
        android:entries="@array/sort_names"
        android:entryValues="@array/sort_clauses"
        android:dialogTitle="Choose a sort order" />
    <CheckBoxPreference
        android:key="alarm"
        android:title="Sound a Lunch Alarm"
        android:summary="Check if you want to know when it is time for lunch" />
    <apt.tutorial.TimePreference
        android:key="alarm_time"
        android:title="Lunch Alarm Time"
        android:defaultValue="12:00"
        android:summary="Set your desired time for the lunch alarm"
        android:dependency="alarm" />
    <CheckBoxPreference
        android:key="use_notification"
        android:title="Use a Notification"
        android:defaultValue="true"
        android:summary="Check if you want a status bar icon at lunchtime, or uncheck for a full-screen notice"
        android:dependency="alarm" />
</PreferenceScreen>

Anyone know where I'm going wrong?

Thanks!

---

UPDATE

Here is a link to a project that contains this custom preference and a simple preference XML file that demonstrates the problem. Even with just two Java classes, the preference XML, and an arrays.xml file, I get this phenomenon. Here is a compiled APK from this project.

解决方案

(cross-posting from the associated android-developers thread)

OK, I figured it out.

There are three possible constructors on a Preference:

MyPreference(Context ctxt)
MyPreference(Context ctxt, AttributeSet attrs)
MyPreference(Context ctxt, AttributeSet attrs, int defStyle)

Somewhere along the line, I picked up the pattern of having the one-parameter constructor chain to the two-parameter constructor (passing null for the 2nd parameter), and having the two-parameter constructor chain to the three-parameter constructor (passing 0 for the 3rd parameter).

And that's not the right answer.

I am hoping that the right answer is to only implement the second constructor, because the correct default style is internal to Android (com.android.internal.R.attr.dialogPreferenceStyle). The second constructor is the one used with inflating preference XML.

Thanks to all for the help!

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