通过预定义的方法以编程方式给视图充气 [英] Programmatically Inflate View with pre-defined measures

问题描述

我有一个这样的布局资源，我想用布局的宽度和高度来填充它:

I have a layout resource like this and a I want to inflate it with the layout width and height:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="75px"
    android:layout_height="25px">

    <TextView
        android:id="@+id/drawable_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="Name" />

    <TextView
        android:id="@+id/drawable_description"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@id/drawable_name"
        android:layout_alignParentLeft="true"
        android:gravity="center_horizontal"
        android:layout_below="@+id/drawable_name"
        android:text="Some Text" />

</RelativeLayout>

视图可以是任何东西，我正在将其转换为位图.

The View could be anything, and I'm converting it to Bitmap.

private Bitmap getBitmap(View v){
    v.measure(MeasureSpec.makeMeasureSpec(mDrawableWidth, MeasureSpec.EXACTLY),
              MeasureSpec.makeMeasureSpec(mDrawableHeight, MeasureSpec.EXACTLY));
    v.layout(0, 0, mDrawableWidth, mDrawableHeight);
    Bitmap returnedBitmap = Bitmap.createBitmap(mDrawableWidth, mDrawableHeight,Bitmap.Config.ARGB_8888);
    Canvas c=new Canvas(returnedBitmap);
    v.draw(c);
    return returnedBitmap;
}

到目前为止，我已经对Width和Height进行了硬编码，并且希望能够以编程方式访问layout_width和layout_height. 有什么办法可以做到这一点? 如果还有另一种方法可以在不指定度量的情况下使用此值来扩大视图的值，请告诉我.

Until now, I have the Width and Height hardcoded and I want to be able to do it programatically, accessing the layout_width and layout_height. Is there any way to achieve this? If there's another way of inflating the view with this values without specifying them in the measure, please let me know.

如果创建自定义视图，是否有可能指定固定的宽度和高度?

If I create a Custom View, is there any chance of specifying the fixed width and height?

推荐答案

此示例应该有效.可能需要进行一些调整才能使其完美，具体取决于您的需求，但请尝试一下:

This example should work. Might take some tweaking to get it perfect, depending on your needs, but give it a shot:

//Get a bitmap from a layout resource. Inflates it into a discarded LinearLayout
//so that the LayoutParams are preserved
public static Bitmap getLayoutBitmap (Context c, int layoutRes, int maxWidth, int maxHeight) {
    View view = LayoutInflater.from(c).inflate(layoutRes, new LinearLayout(c), false);
    return getViewBitmap(view, maxWidth, maxHeight);
}

public static Bitmap getViewBitmap (View v, int maxWidth, int maxHeight) {
    ViewGroup.LayoutParams vParams = v.getLayoutParams();

    //If the View hasn't been attached to a layout, or had LayoutParams set
    //return null, or handle this case however you want
    if (vParams == null) {
        return null;
    }

    int wSpec = measureSpecFromDimension(vParams.width, maxWidth);
    int hSpec = measureSpecFromDimension(vParams.height, maxHeight);

    v.measure(wSpec, hSpec);

    final int width = v.getMeasuredWidth();
    final int height = v.getMeasuredHeight();

    //Cannot make a zero-width or zero-height bitmap
    if (width == 0 || height == 0) {
        return null;
    }

    v.layout(0, 0, width, height);

    Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(result);
    v.draw(canvas);

    return result;
}

private static int measureSpecFromDimension (int dimension, int maxDimension) {
    switch (dimension) {
        case ViewGroup.LayoutParams.MATCH_PARENT:
            return View.MeasureSpec.makeMeasureSpec(maxDimension, View.MeasureSpec.EXACTLY);
        case ViewGroup.LayoutParams.WRAP_CONTENT:
            return View.MeasureSpec.makeMeasureSpec(maxDimension, View.MeasureSpec.AT_MOST);
        default:
            return View.MeasureSpec.makeMeasureSpec(dimension, View.MeasureSpec.EXACTLY);
    }
}

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