动态加控件
布局的layout文件内容:
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:id="@+id/linearlayout">
<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="wrap_content" android:layout_height="wrap_content">
<Button android:layout_height="wrap_content" android:id="@+id/add"
android:text="Add" android:layout_width="100px"></Button>
<Button android:layout_height="wrap_content"
android:layout_width="100px" android:text="Remove" android:id="@+id/remove"></Button>
</LinearLayout>
<TextView android:id="@+id/TextView01" android:text="This is textView."
android:layout_width="fill_parent" android:gravity="center"
android:layout_height="50px"></TextView>
</LinearLayout>
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对应Activity的内容:
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package com.foxconn.dialog;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
public class DialogTest extends Activity implements OnClickListener {
private Button add_btn, remove_btn;
private LinearLayout linearLayout;
private int index = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findViews();
register();
}
private void register() {
add_btn.setOnClickListener(this);
remove_btn.setOnClickListener(this);
}
private void findViews() {
add_btn = (Button) findViewById(R.id.add);
remove_btn = (Button) findViewById(R.id.remove);
linearLayout = (LinearLayout) findViewById(R.id.linearlayout);
}
protected View createView() {
Button btn = new Button(this);
btn.setId(index++);
btn.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
btn.setText("aaaaaa" + index);
return btn;
}
private void removeView() {
//获取linearlayout子view的个数
int count = linearLayout.getChildCount();
//研究整个LAYOUT布局,第0位的是含add和remove两个button的layout
//第count-1个是那个文字被置中的textview
//因此,在remove的时候,只能操作的是0<location<count-1这个范围的
//在执行每次remove时,我们从count-2的位置即textview上面的那个控件开始删除~
if (count - 2 > 0) {
//count-2>0用来判断当前linearlayout子view数多于2个,即还有我们点add增加的button
linearLayout.removeViewAt(count - 2);
}
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.add:
linearLayout.addView(createView(), 1);
break;
case R.id.remove:
removeView();
break;
default:
break;
}
}
}
posted on 2011-08-21 23:39 cn三少<script></script> 阅读(306) 评论(0) 编辑 收藏 举报