从状态列表可绘制对象中获取特定的可绘制对象

问题描述

我有一个状态列表可绘制对象，并且我想从状态列表可绘制对象中获取一个特定的可绘制对象:

I have a state list drawable, and i want to get a specific drawable from the state list drawable:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" xmlns:kplus="http://schemas.android.com/apk/res-auto">


    <item kplus:key_type_space_alt="true" android:state_pressed="true" android:drawable="@drawable/space_1_pressed" />
    <item kplus:key_type_space_alt="true" android:drawable="@drawable/space_1_normal" />

    <!-- TopNav keys. -->

    <item kplus:key_type_topnav="true" android:state_pressed="true" android:drawable="@drawable/tab_down" />
    <item kplus:key_type_topnav="true" android:state_selected="true" android:drawable="@drawable/tab_down" />
    <item kplus:key_type_topnav="true" android:drawable="@drawable/tab_normal" />

    <!-- TopRow keys. -->

    <item kplus:key_type_toprow="true" android:state_pressed="true" android:drawable="@drawable/numeric_presseed" />
    <item kplus:key_type_toprow="true" android:drawable="@drawable/numeric_normal" />
</selector>

我为每个键选择正确的可绘制状态，如下所示:

I select the correct drawable state for each key, something like this:

if (keyIsNumbers) {
    if (KPlusInputMethodService.sNumbersState == 2) {
        drawableState = mDrawableStatesProvider.KEY_STATE_TOPNAV_CHECKED;
    }
}

现在状态定义如下:

KEY_STATE_TOPNAV_NORMAL = new int[] {keyTypeTopNavAttrId};
KEY_STATE_TOPNAV_PRESSED = new int[] {keyTypeTopNavAttrId, android.R.attr.state_pressed};
KEY_STATE_TOPNAV_CHECKED = new int[] {keyTypeTopNavAttrId, android.R.attr.state_selected};

现在我的问题是如何为每个状态提取正确的可绘制对象?我需要获取drawable的9patch填充，因为如果状态在9patch上具有不同的填充，它将仅获取顶部可绘制的填充，并且我想为每个键手动设置填充(drawable.getPadding(rect))

Now my question is how to extract the correct drawable for each state ? I need to get the 9patch padding of the drawable, because if the state have different padding on 9patch it will get the padding only for the top drawable, and i want to set the padding manually for each key (drawable.getPadding(rect)).

推荐答案

有没有公共API 不能从该州获取可绘制对象.

There is no public API to get the drawable from the state.

StateListDrawable ，但它们是@hide，带有注释待处理的API委员会" .

您可以通过反思来调用它们……但这需要您自担风险！. (在将来的版本中可能会更改)

You can invoke them by reflection... but it's at your own risk !!!. (it may change in future releases)

这些方法是:

• getStateDrawableIndex
• getStateDrawable

• getStateDrawableIndex
• getStateDrawable

这里是进行操作的方式(省略的例外):

Here is how to proceed (exceptions omitted) :

int[] currentState = view.getDrawableState();
StateListDrawable stateListDrawable = (StateListDrawable)view.getBackground();
Method getStateDrawableIndex = StateListDrawable.class.getMethod("getStateDrawableIndex", int[].class);
Method getStateDrawable = StateListDrawable.class.getMethod("getStateDrawable", int.class);
int index = (int) getStateDrawableIndex.invoke(stateListDrawable,currentState);
Drawable drawable = (Drawable) getStateDrawable.invoke(stateListDrawable,index);

这篇关于从状态列表可绘制对象中获取特定的可绘制对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！