变化与LT;层项目＆GT;在Java code项目 [英] Change <layer-item> items by Java code

问题描述

我有以下的XML：

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

<item android:id="@+id/customPlayerProgressBg">
    <shape>
        <gradient
                android:startColor="#FF999999"
                android:endColor="#FF999999"
        />
    </shape>
</item>

<item android:id="@+id/customPlayerProgressSecondary">
    <clip>
        <shape>
            <gradient
                    android:startColor="#FF5C3C68"
                    android:endColor="#FF5C3C68"
            />
        </shape>
    </clip>
</item>
<item
    android:id="@+id/customPlayerProgress"
>
    <clip>
        <shape>
            <gradient
                android:startColor="#FF5C3C68"
                android:endColor="#FF5C3C68"
            />
        </shape>
    </clip>
</item>

</layer-list>

我想通过Java的code改变customPlayerProgress和customPlayerProgressSecondary。这怎么可能实现呢？

I want to change the "customPlayerProgress" and the "customPlayerProgressSecondary" by Java code. How can that be accomplished?

推荐答案

假设你想有通过Java code对它们的访问被加载在你的应用程序被拉伸后，你应该能够做一些事情如下所示：

Assuming that you want to have access to them through Java code after they are loaded as a Drawable in your app, you should be able to do something like the following:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    final LayerDrawable ld = (LayerDrawable) getResources().getDrawable(R.drawable.my_drawable);
    final ClipDrawable d1 = (ClipDrawable) ld.findDrawableByLayerId(R.id.customPlayerProgress);
    final ClipDrawable d2 = (ClipDrawable) ld.findDrawableByLayerId(R.id.customPlayerProgressSecondary);

    /* modify ld, d1 and d2 by calling their methods here */
}

另外，也要看看<一href="http://stackoverflow.com/questions/8018435/android-how-to-change-a-layer-list-drawable">this对于一些更多的想法。

Also look at this for some more ideas.

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