在机器人制作动态布局的每一行中的ListView机器人、布局、动态、ListView

2023-09-07 22:24:25 作者:冻の结

予有其中包含的ListView的每一行基本布局(其是realtive布局和里面具有TextView中)。一个xml文件

我想改变这种布局的属性的ListView的每一行就像不同的布局宽度和每行的高度。我想动态设置宽度和高度的值。

有没有办法周围做到这一点?

我想改变,身高和体重动态,为每个视图我的XML文件

 < XML版本=1.0编码=UTF-8&GT?;
<的LinearLayout
    的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:layout_height =WRAP_CONTENT
    机器人:ID =@ + ID / ITEM1
    机器人:layout_width =WRAP_CONTENT>
    <的TextView
        机器人:ID =@ + ID /文
        机器人:layout_height =WRAP_CONTENT
        机器人:重力=center_vertical
        机器人:文本=文本
        机器人:能见度=看见
        机器人:layout_width =WRAP_CONTENT
        机器人:文字颜色=#FF200010
        机器人:后台=#FFFCCCFF/>
< / LinearLayout中>
 

和我的全部文件

 包com.test.list;

进口的java.util.ArrayList;
进口java.util.TreeSet中;

进口android.app.ListActivity;
进口android.content.Context;
进口android.os.Bundle;
进口android.util.Log;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.BaseAdapter;
进口android.widget.LinearLayout;
进口android.widget.TextView;


公共类MultipleItemsList扩展ListActivity {

    私人MyCustomAdapter mAdapter;

    公共语境上下文= getApplicationContext();


    @覆盖
    公共无效的onCreate(包savedInstanceState){
        super.onCreate(savedInstanceState);
        mAdapter =新MyCustomAdapter();
        的for(int i = 1; I< 50;我++){
            mAdapter.addItem(项目+ I);
            如果(I%4 == 0){
                mAdapter.addSeparatorItem(分隔符+ I);
            }
        }
        setListAdapter(mAdapter);
    }

    私有类MyCustomAdapter扩展了BaseAdapter {

        私有静态最终诠释TYPE_ITEM = 0;
        私有静态最终诠释TYPE_SEPARATOR = 1;
        私有静态最终诠释TYPE_MAX_COUNT = TYPE_SEPARATOR + 1;

        私人的ArrayList<字符串> MDATA =新的ArrayList<字符串>();
        私人LayoutInflater mInflater;

        私人TreeSet的<整数GT; mSeparatorsSet =新TreeSet的<整数GT;();

        公共MyCustomAdapter(){
            mInflater =(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        公共无效的addItem(最后弦乐项目){
            mData.add(项目);
            notifyDataSetChanged();
        }

        公共无效addSeparatorItem(最后弦乐项目){
            mData.add(项目);
            //保存分离器位置
            mSeparatorsSet.add(mData.size() -  1);
            notifyDataSetChanged();
        }

        @覆盖
        公众诠释getItemViewType(INT位置){
            返回mSeparatorsSet.contains(位置)? TYPE_SEPARATOR:TYPE_ITEM;
        }

        @覆盖
        公众诠释getViewTypeCount(){
            返回TYPE_MAX_COUNT;
        }

        @覆盖
        公众诠释getCount将(){
            返回mData.size();
        }

        @覆盖
        公共字符串的getItem(INT位置){
            返回mData.get(位置);
        }

        @覆盖
        众长getItemId(INT位置){
            返回的位置;
        }

        @覆盖
        公共查看getView(INT位置,查看convertView,ViewGroup中父){
            ViewHolder支架=无效;
            整型= getItemViewType(位置);
            的System.out.println(getView+位置++ convertView +型=+型);
            如果(convertView == NULL){
                持有人=新ViewHolder();
                开关(类型){
                    案例TYPE_ITEM:
                            convertView = mInflater.inflate(R.layout.item1,NULL);
                            Log.e(Ronak,Here1);
                            TextView的T =(TextView中)convertView.findViewById(R.id.text);
                            t.se​​tWidth(100);
                            t.se​​tHeight(600);
                            t.se​​tText(这是看第一类);
                            holder.textView =(TextView中)convertView.findViewById(R.id.text);
                            Log.e(Ronak,达here3);
                            打破;
                    案例TYPE_SEPARATOR:

                          convertView = mInflater.inflate(R.layout.item1,NULL);
                          TextView的T2 =(TextView中)convertView.findViewById(R.id.text);
                            t2.setWidth(200);
                            t2.setHeight(500);
                            t2.setText(这是第二种类型的视图);
                          holder.textView =(TextView中)convertView.findViewById(R.id.text);
                          打破;
                }
                convertView.setTag(保持器);
            } 其他 {
                支架=(ViewHolder)convertView.getTag();
            }
            holder.textView.setText(mData.get(位置));
            返回convertView;
        }

    }

    公共静态类ViewHolder {
        公众的TextView TextView的;
    }

}
 

解决方案 2018年中国65家机器人产业园布局与规划汇总盘点

您可以实施 ViewHolder 模式为您的适配器,并为每个位置,抬高自己的布局。

要做到这一点,覆盖 getView 是这样的:

 公开查看getView(INT位置,查看convertView,ViewGroup中父){

   //一个ViewHolder不断提及孩子的意见,以避免不必要的来电
  //到每一行上findViewById()。
  ViewHolder持有人;
  //当convertView不为空,我们可以直接重复使用它,也没有必要
  //为reinflate它。我们只吹一个新的视图时,convertView提供
  //通过的ListView为空。

  如果(convertView == NULL){

    convertView = mInflater.inflate(R.layout.sample,NULL);
    //创建一个ViewHolder和存储引用的两个孩子意见
    //我们希望将数据绑定到。
   持有人=新ViewHolder();
   holder.name =(TextView中)convertView.findViewById(R.id.text);
   holder.icon =(ImageView的)convertView.findViewById(R.id.icon);
   convertView.setTag(保持器);
 } 其他 {
   //获取ViewHolder回得到快速访问的TextView
   //和ImageView的。
   支架=(ViewHolder)convertView.getTag();
 }


  //与支架有效地绑定的数据。
  holder.name.setText(myElements.get(ID));
  holder.icon.setImageBitmap(mIcon1);

返回convertView;
}
 

了解更多有关这对Android开发者网站这里

编辑:

要更改每行的宽度和高度,你可以绑定数据部分使用类似下面的每一行

  RelativeLayout的RL =(RelativeLayout的)findViewById(R.id.yourId);
。rl.getLayoutParams()高度= 100;
。rl.getLayoutParams()宽= 100;`
 

I have a xml file which contains basic layout for each row of ListView(which is a realtive layout and has TextView inside it).

I want to change the attributes of this layout for each row of ListView like different layout width and height of each row. I want to set the values of width and height dynamically.

Is there any way around to do this?

My xml file which I want to change, height and weight dynamically, for each view

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="wrap_content"
    android:id="@+id/item1"
    android:layout_width="wrap_content">
    <TextView
        android:id="@+id/text"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:text="text"
        android:visibility="visible"
        android:layout_width="wrap_content"
        android:textColor="#FF200010"
        android:background="#FFFCCCFF" />
</LinearLayout> 

And my full file is

package com.test.list;

import java.util.ArrayList;
import java.util.TreeSet;

import android.app.ListActivity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;


public class MultipleItemsList extends ListActivity {

    private MyCustomAdapter mAdapter;

    public Context context =getApplicationContext();


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mAdapter = new MyCustomAdapter();
        for (int i = 1; i < 50; i++) {
            mAdapter.addItem("item " + i);
            if (i % 4 == 0) {
                mAdapter.addSeparatorItem("separator " + i);
            }
        }
        setListAdapter(mAdapter);
    }

    private class MyCustomAdapter extends BaseAdapter {

        private static final int TYPE_ITEM = 0;
        private static final int TYPE_SEPARATOR = 1;
        private static final int TYPE_MAX_COUNT = TYPE_SEPARATOR + 1;

        private ArrayList<String> mData = new ArrayList<String>();
        private LayoutInflater mInflater;

        private TreeSet<Integer> mSeparatorsSet = new TreeSet<Integer>();

        public MyCustomAdapter() {
            mInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        public void addItem(final String item) {
            mData.add(item);
            notifyDataSetChanged();
        }

        public void addSeparatorItem(final String item) {
            mData.add(item);
            // save separator position
            mSeparatorsSet.add(mData.size() - 1);
            notifyDataSetChanged();
        }

        @Override
        public int getItemViewType(int position) {
            return mSeparatorsSet.contains(position) ? TYPE_SEPARATOR : TYPE_ITEM;
        }

        @Override
        public int getViewTypeCount() {
            return TYPE_MAX_COUNT;
        }

        @Override
        public int getCount() {
            return mData.size();
        }

        @Override
        public String getItem(int position) {
            return mData.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder = null;
            int type = getItemViewType(position);
            System.out.println("getView " + position + " " + convertView + " type = " + type);
            if (convertView == null) {
                holder = new ViewHolder();
                switch (type) {
                    case TYPE_ITEM:
                            convertView = mInflater.inflate(R.layout.item1,null);
                            Log.e("Ronak", "Here1");
                            TextView t= (TextView)convertView.findViewById(R.id.text);
                            t.setWidth(100);
                            t.setHeight(600);
                            t.setText("This is first type of view");
                            holder.textView = (TextView)convertView.findViewById(R.id.text);
                            Log.e("Ronak","reached here3");
                            break;
                    case TYPE_SEPARATOR:

                          convertView = mInflater.inflate(R.layout.item1, null);
                          TextView t2= (TextView)convertView.findViewById(R.id.text);
                            t2.setWidth(200);
                            t2.setHeight(500);
                            t2.setText("This is second type of view");
                          holder.textView = (TextView)convertView.findViewById(R.id.text);
                          break;
                }
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder)convertView.getTag();
            }
            holder.textView.setText(mData.get(position));
            return convertView;
        }

    }

    public static class ViewHolder {
        public TextView textView;
    }

}

解决方案

You can implement a ViewHolder pattern for your adapter, and for each position, inflate your own layout.

To do that, override getView like this:

public View getView(int position, View convertView, ViewGroup parent) {            

   // A ViewHolder keeps references to children views to avoid unneccessary calls            
  // to findViewById() on each row.            
  ViewHolder holder;            
  // When convertView is not null, we can reuse it directly, there is no need            
  // to reinflate it. We only inflate a new View when the convertView supplied            
  // by ListView is null.            

  if (convertView == null) {                

    convertView = mInflater.inflate(R.layout.sample, null);   
    // Creates a ViewHolder and store references to the two children views                
    // we want to bind data to.               
   holder = new ViewHolder();                
   holder.name = (TextView) convertView.findViewById(R.id.text);               
   holder.icon = (ImageView) convertView.findViewById(R.id.icon);                
   convertView.setTag(holder);            
 } else {                
   // Get the ViewHolder back to get fast access to the TextView                
   // and the ImageView.
   holder = (ViewHolder) convertView.getTag();
 }             


  // Bind the data efficiently with the holder. 
  holder.name.setText(myElements.get(id)); 
  holder.icon.setImageBitmap( mIcon1 );

return convertView;
}  

Read more about this on the Android developer site here

EDIT:

To change the width and height of each row, you can use something like the following, for each row on bind data section :

RelativeLayout rl = (RelativeLayout) findViewById(R.id.yourId); 
rl.getLayoutParams().height = 100;
rl.getLayoutParams().width = 100;`