Android的网格布局只显示最后一个孩子 [英] Android GridLayout only shows last child

问题描述

我是新Android开发。我一直在与使用网格布局，以显示动态插入ImageViews。

I am new to Android Development. I have been working with using a GridLayout to display Dynamically inserted ImageViews.

我的问题是位于onFocusWindowChanged，但我贴我的onCreate，我做我的图像的分配。

My issue is located in "onFocusWindowChanged" but I pasted my onCreate where I do my assignments of the images.

private List<Behavior> behaviors = null;
private static int NUM_OF_COLUMNS = 2;
private List<ImageView> images;
private GridLayout grid;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_behaviors);

    XMLPullParserHandler parser = new XMLPullParserHandler();

    try {
        behaviors = parser.parse(getAssets().open("catagories.xml"));
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    grid = (GridLayout) findViewById(R.id.behaviorGrid);
    images = new ArrayList<ImageView>();

    grid.setColumnCount(NUM_OF_COLUMNS);
    grid.setRowCount(behaviors.size() / NUM_OF_COLUMNS);

    for (Behavior behavior : behaviors)
        images.add(this.getImageViewFromName(behavior.getName()));

}

@Override
public void onWindowFocusChanged(boolean hasFocus) {

    super.onWindowFocusChanged(hasFocus);
    View view = (View) findViewById(R.id.scrollView);

    int width = (int) (view.getWidth() * .45);
    Log.i("ViewWidth", Integer.toString(width));

    GridLayout.LayoutParams lp = new GridLayout.LayoutParams();
    lp.height = width;
    lp.width = width;

    int childCount = images.size();

    ImageView image;

    for (int i = 0; i < childCount-1; i++) {

        image = images.get(i);
        image.setLayoutParams(lp);      
        grid.addView(image);

    }

}

在我的（短）previous经验，采用

In my (short) previous experience, using

grid.add(View); 

工作正常，但现在我只看到只有最后一个子画面。通过调试找我可以看到在GridView被填充的不仅仅是最后一个元素，以及最后的ImageView的多。

worked fine, but now I am only seeing the last child display only. Looking through the debugger I can see that the gridview is being populated with more than just the last element, as well as the last imageview.

感谢您的帮助。

推荐答案

您应该为每个ImageView的一个GridLayout.LayoutParams：

you should create a GridLayout.LayoutParams for each ImageView:

for (int i = 0; i < childCount-1; i++) {
    GridLayout.LayoutParams lp = new GridLayout.LayoutParams();
    lp.height = width;
    lp.width = width;

    ......
}

GridLayout.LayoutParams包含的位置信息，例如[柱：2，行：3]。在code，所有ImageViews都设置在同一GridLayout.LayoutParams，所以它们存在于相同的细胞（相互重叠）。

GridLayout.LayoutParams contains location information, e.g [column:2, row:3]. In your code, all ImageViews are set the same GridLayout.LayoutParams, so they are located in the same cell(overlapping each other).

在使用LinearLayout.LayoutParams相反，在它里面没有位置信息。网格布局会为每个子视图新GridLayout.LayoutParams，因此所有ImageViews用自己不同的GridLayout.LayoutParams和位置。

When use LinearLayout.LayoutParams instead, there is no location information in it. GridLayout will create a new GridLayout.LayoutParams for each child view, so all ImageViews use their own different GridLayout.LayoutParams and location.

预祝帮助。您可以阅读GridLayout.java和ViewGroup.java的更多细节。

Wish this help. You can read the GridLayout.java and ViewGroup.java for more details.

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