如何在布局中的动态位置添加按钮? [英] How can we add buttons at dynamic positions in layout?

问题描述

如何在布局或使用画布而不是表格布局的动态位置添加按钮?

How can we add buttons at dynamic positions in layout or using canvas, not in table layout?

有人可以帮我吗?

推荐答案

使用RelativeLayout将控件放置在您喜欢的位置.看一下这个链接: 相对布局中的动态TextView

Use RelativeLayout to position your controls where you like them. Have a look at this link: Dynamic TextView in Relative layout

在这里 如何以编程方式创建一个带有两个按钮的RelativeLayout，一个位于另一个按钮之上?

如果您只想在XML中实现它.看这里: http://www.mkyong.com/android/android-relativelayout-example/

If you like to achieve it within XML only. Look here: http://www.mkyong.com/android/android-relativelayout-example/

下面是一个示例，说明如何使用RelativeLayout动态放置控件:

Here an example how you could use the RelativeLayout to position your controls dynamically:

public class MainActivity extends Activity {

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

        // Creating a new RelativeLayout
        RelativeLayout mainRelativeLayout = new RelativeLayout(this);

        // Defining the RelativeLayout layout parameters with Fill_Parent
        RelativeLayout.LayoutParams relativeLayoutParameters = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.FILL_PARENT);

        // Creating a new Left Button
        Button buttonLeft = new Button(this);
        buttonLeft.setText("Left");

        // Creating a new Left Button with Margin
        Button buttonLeftWithMargin = new Button(this);
        buttonLeftWithMargin.setText("Left with Margin");

        // Creating a new Center Button
        Button buttonCenterParent = new Button(this);
        buttonCenterParent.setText("Center");

        // Creating a new Bottom Button
        Button buttonBottom = new Button(this);
        buttonBottom.setText("Bottom");

        // Add a Layout to the Buttons
        AddButtonLayout(buttonLeft, RelativeLayout.ALIGN_PARENT_LEFT);
        AddButtonLayout(buttonCenterParent, RelativeLayout.CENTER_IN_PARENT);
        AddButtonLayout(buttonBottom, RelativeLayout.ALIGN_PARENT_BOTTOM);

        // Add a Layout to the Button with Margin
        AddButtonLayout(buttonLeftWithMargin, RelativeLayout.ALIGN_PARENT_LEFT, 30, 80, 0, 0);

        // Add the Buttons to the View
        mainRelativeLayout.addView(buttonLeft);
        mainRelativeLayout.addView(buttonCenterParent);
        mainRelativeLayout.addView(buttonBottom);
        mainRelativeLayout.addView(buttonLeftWithMargin);

        // Setting the RelativeLayout as our content view
        setContentView(mainRelativeLayout, relativeLayoutParameters);
    }

    private void AddButtonLayout(Button button, int centerInParent, int marginLeft, int marginTop, int marginRight, int marginBottom) {
        // Defining the layout parameters of the Button
        RelativeLayout.LayoutParams buttonLayoutParameters = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);

        // Add Margin to the LayoutParameters
        buttonLayoutParameters.setMargins(marginLeft, marginTop, marginRight, marginBottom);

        // Add Rule to Layout
        buttonLayoutParameters.addRule(centerInParent);

        // Setting the parameters on the Button
        button.setLayoutParams(buttonLayoutParameters);     
    }

    private void AddButtonLayout(Button button, int centerInParent) {
        // Just call the other AddButtonLayout Method with Margin 0
        AddButtonLayout(button, centerInParent, 0 ,0 ,0 ,0);
    }
}

您应该得到这样的东西:

And you should get something like this:

这篇关于如何在布局中的动态位置添加按钮?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IT屋！