Question

http://www.f.org/Depts/DGACM/index_spanish.htm 内部的数据或与之相关的数据? 请允许我重复一下<代码>LayoutParams的同样例子,再用多种电话打addView(,有不同意见?

没有任何东西。

WOW

答案是无。

public class SymbolPadActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    RelativeLayout.LayoutParams labelParams;

    /*
     * This block to reuse is not working
    labelParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    labelParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE);
    labelParams.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);
    */


    RelativeLayout mover = new RelativeLayout(this);

    TextView textView;
    for(int leftMargin = 0; leftMargin<3000; leftMargin += 100) {
        for(int topMargin=0; topMargin<800; topMargin += 40) {

            // I can t omit these 3 lines 
            labelParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            labelParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE);
            labelParams.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);

            labelParams.leftMargin = leftMargin;
            labelParams.topMargin = topMargin;

            textView = new TextView(this);
            textView.setText("(" + leftMargin + "," + topMargin + ")");
            mover.addView(textView, labelParams);

        iii
    iii




    RelativeLayout.LayoutParams moverParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    moverParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE);
    moverParams.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);
    moverParams.leftMargin = 0;
    moverParams.topMargin = 0;

    RelativeLayout stator = new RelativeLayout(this);
    stator.addView(mover, 0, moverParams);

    setContentView(stator);


iii

iii

Answer 1

没有任何东西。

This means you need to make the more conservative choice, no matter what the current implementation is, as the implementation could change.

因此,您需要假设,重新使用<代码>LayoutParams和不同的<代码> >Views的事例是不安全的。

就我能说的话来说,这确实是值得的:ViewGroup。页: 1

Answer 2

这是一个老的问题,但似乎有一个最新的答案:

The LayoutParams has a constructor for copying another Source: http://developer.android.com/reference/android/view/ViewGroup.LayoutParams.html

ViewGroup.LayoutParams(ViewGroup.LayoutParams source)

This would suggest not to re-use it, but perhaps to create 1 layout params object with everything you need, then just call

new LayoutParams(someLayoutParamsToReUse)

在我的案件中,我要把一个纽托邦的布局定在另一个纽州。我最初尝试过:

button.setLayoutParams(button2.getLayoutParams());

但这不应奏效:

button.setLayoutParams(new LayoutParms(button2.getLayoutParams))

友情链接