设置preference布局，改变属性，它 [英] Setting preference layout and changing the attribute in it

问题描述

是有可能访问编程被设定为一个preference布局？

is it possible to access programmatically a layout which is set to a Preference?

下面是我，一个很简单的项目 - 概念验证

Here is what I have, a very simple project - proof of concept

在preference活动：

The Preference Activity:

package com.example;

import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.util.Log;
import android.view.View;

public class PreferenceExampleActivity extends PreferenceActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);

        ImageView v = (ImageView) findViewById(R.id.iconka);

    }
}

资源XML：

The resource XML:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
  xmlns:android="http://schemas.android.com/apk/res/android" 
  android:key="settings">
    <PreferenceCategory 
        android:title="Category Setting Name" 
        android:order="1" 
        android:key="Main">
        <Preference 
            android:order="1" 
            android:title="Setting" 
            android:summary="Setting1" 
            android:layout="@layout/profile_preference_row"
            android:key="profile" />
    </PreferenceCategory>
</PreferenceScreen>

为preference自定义布局：

The custom layout for the Preference:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@android:id/widget_frame"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:minHeight="?android:attr/listPreferredItemHeight"
    android:gravity="center_vertical"
    android:paddingRight="?android:attr/scrollbarSize">



    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dip"
        android:layout_marginRight="6dip"
        android:layout_marginTop="6dip"
        android:layout_marginBottom="6dip"
        android:layout_weight="1">

        <TextView android:id="@+android:id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:ellipsize="marquee"
            android:fadingEdge="horizontal" />

        <TextView android:id="@+android:id/summary"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@android:id/title"
            android:layout_alignLeft="@android:id/title"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:textColor="?android:attr/textColorSecondary"
            android:maxLines="4" />

    </RelativeLayout>
    <ImageView
        android:id="@+id/iconka"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        />
</LinearLayout>

我要的是能够从活动从那里进入iconka的ImageView和改变形象。我使用的API 8（Android 2.2的）

What I want is to be able to access the "iconka" ImageView from the Activity and change the image from there. I am using API 8 (Android 2.2)

目前的V为空，我没有任何想法，这是为什么。

Currently the "v" is null and I don't have any idea why is that.

一个暗示将大大AP preciated！

A hint will be much appreciated!

更新 - 解决方案： 其实，我需要一个自定义的preference，我可以修改我的需要。这一个是一个实用指南，如何在项目中创建自己的自定义preference： 的Andr​​oid和放大器;阿米尔 - 安卓preferences 的 看到零件时，笔者创建自定义preference类。

Update - The Solution: Actually, I needed a custom preference which I can modify for my needs. This one is a practical guide how to create your own Custom preference in your project: Android & Amir - Android Preferences See the part when the author creates a custom preference class.

推荐答案

尝试采取看看上的ImageView下面的讨论。可以帮助你与你的问题。

Try taking a look at the following discussions on imageview. Might help you with your issue.

<一个href="http://stackoverflow.com/questions/5369252/android-findviewbyid-of-an-imageview-custom-adapter">Android: findViewById一个ImageView的（自定义适配器）的

<一个href="http://stackoverflow.com/questions/5856265/android-getting-nullpointerexception-for-imageview-imag-imageview-findview">Android ：越来越NullPointerException异常的ImageView的IMAG =（ImageView的）findViewById（R.id.image）

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