如何在Android运行时动态放置编辑文本?

followig是我的代码:

public class ABCActivity extends Activity   {
  EditText ed;

  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ed = new EditText(ABCActivity.this);
    ed.setEnabled(false);
    layout =new LinearLayout(this);
    LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT, 1.0f);
    layout.setLayoutParams(params);
    btn = new Button(this);
    btn.setLayoutParams(params);
    btn.setText("Change");

    RelativeLayout.LayoutParams params2 = (RelativeLayout.LayoutParams) ed.getLayoutParams();
    params2.leftMargin = 10;
    params2.topMargin = 10;
    ed.setLayoutParams(params2);

    layout.addView(btn);
    layout.addView(ed);

   }
}


使力量靠近:

RelativeLayout.LayoutParams params2 = (RelativeLayout.LayoutParams) ed.getLayoutParams();


错误:空指针异常
我尝试使用相对布局.....
但不起作用

最佳答案

Lars Vogel here在这方面有很棒的教程。基本上,您必须使用特定于布局的LayoutParams来通过Java定位视图。

07-24 09:47
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