android - 在 Android 中构建 TreeView 控件的建议

Question

关于在 Android 中构建 TreeView 控件的建议

Answer 1

我自己构建了一个支持 n 层的 treeview。它很容易在触摸屏上使用，尤其是在屏幕较大的设备上。 我使用了一个扩展 ListviewAdapter 的类并创建了我自己的 listitem。这些项目知道它们在哪个级别，并且它们继承了它们父级的 expandstate(通过记住它们自己的状态)。这棵树很快就可以处理数千个项目。

编辑:添加了代码，但是我在评论中写的方式，它不会有太大帮助，因为它非常接近我自己的需求。

package de.supinfo.FISDroid;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.drawable.PaintDrawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class EfficientAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private Bitmap mIcon1;

private int active_view;
private int last_path;
public String[][] values = new String[0][];

public EfficientAdapter(Context context, String[][] str_arr_values, int int_active_view) {
    // Cache the LayoutInflate to avoid asking for a new one each time.
    mInflater = LayoutInflater.from(context);
    values = str_arr_values;
    active_view = int_active_view;
}

public Object getItem(int position) {
    return position;
}

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

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

    int padding = 0;

    // int selfstate = Integer.parseInt(values[position][4].trim());

    ViewHolder holder;
    if (convertView == null) {

        convertView = mInflater.inflate(R.xml.list_item_icon_text, null);

        holder = new ViewHolder();
        holder.text = (TextView) convertView.findViewById(R.id.text_view);
        holder.icon = (ImageView) convertView.findViewById(R.id.img_view);
        holder.expanded = (ImageView) convertView.findViewById(R.id.ImageView01);
        holder.llout = (LinearLayout) convertView.findViewById(R.id.list_item_icon_text);
        holder.docs = (TextView) convertView.findViewById(R.id.doc_count);
        holder.prun = (ImageView) convertView.findViewById(R.id.prun);
        holder.coord = (ImageView) convertView.findViewById(R.id.coord);
        holder.button = (Button) convertView.findViewById(R.id.button);
        holder.button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                main.tabHost.setCurrentTab(2);
            }

        });
        convertView.setTag(holder);
    } else {

        holder = (ViewHolder) convertView.getTag();
    }

    // Bind the data efficiently with the holder.
    String text = values[position][0];

    String docs = values[position][11];
    if (!docs.equals("0")) {
        // TODO
        // Anzeige das Dokumente vorhanden sind, eventuell Anzahl
        holder.docs.setText(docs);
        holder.docs.setVisibility(View.VISIBLE);
    } else {
        holder.docs.setVisibility(View.INVISIBLE);
    }
    holder.coord.setVisibility(values[position][12].equals("") || values[position][12].equals("0") || values[position][12].equals("0.0") ? View.INVISIBLE : View.VISIBLE);
    holder.prun.setVisibility(values[position][14].equals("") ? View.INVISIBLE : View.VISIBLE);
    holder.text.setText(text);
    holder.text.setTextSize(GlobalVars.Style.TextSize);
    if (position == active_view) {
        holder.text.setTextColor(R.color.headline_font);
        PaintDrawable pd = new PaintDrawable(Color.RED);
        holder.llout.setBackgroundDrawable(pd);
        holder.text.setSingleLine(false);
        holder.button.setVisibility(values[position][1].equals("-1") ? View.GONE : View.VISIBLE);
    } else {
        holder.text.setTextColor(R.color.headline_font);

        PaintDrawable pd = new PaintDrawable(Color.TRANSPARENT);
        holder.llout.setBackgroundDrawable(pd);
        holder.text.setSingleLine(true);
        holder.button.setVisibility(View.GONE);
    }

    int i = Integer.parseInt(values[position][5].trim());
    mIcon1 = GlobalHelper.GetIcon(i);
    holder.icon.setImageBitmap(mIcon1);

    if (values[position][8].equals("-1")) {
        holder.expanded.setVisibility(View.VISIBLE);
        holder.expanded.setImageResource(android.R.drawable.ic_input_add);
    } else if (values[position][8].equals("0")) {
        holder.expanded.setVisibility(View.INVISIBLE);
    } else if (values[position][8].equals("1")) {
        holder.expanded.setVisibility(View.VISIBLE);
        if (values[position][9].equals("1")) {
            holder.expanded.setImageResource(android.R.drawable.ic_menu_revert);
        } else {
            holder.expanded.setImageResource(android.R.drawable.ic_input_add);
        }
    }
    padding = Integer.parseInt(values[position][7].trim()) * 24;
    convertView.setPadding(padding, 5, 5, 5);

    return convertView;
}

static class ViewHolder {
    LinearLayout llout;
    TextView text;
    ImageView icon;
    ImageView expanded;
    ImageView coord;
    ImageView prun;
    TextView docs;
    Button button;
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return values.length;
}

public String[] getValues(int position) {
    return values[position];
}

public String getValue(int position) {
    return values[position][0];
}

public String getDatid(int position) {
    return values[position][1];
}

public String getPath(int position) {
    return values[position][2];
}

public String getParent(int position) {
    return values[position][3];
}

public void set_active_view() {
    active_view = GlobalVars.cn.index;
}

public int get_active_view() {
    return active_view;
}

public void set_last_path(int position) {
    last_path = position;
}

public int get_last_path() {
    return last_path;
}

}

编辑:添加了 xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/list_item_icon_text" 
xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_height="wrap_content" 
android:layout_centerVertical="true" 
android:background="@color/tree_normal_back" 
android:padding="1dip" 
android:orientation="horizontal" 
android:layout_width="fill_parent">
<LinearLayout 
    android:id="@+id/plusminus" 
    android:layout_height="48dip" 
    android:layout_width="24dip" 
    android:gravity="right|center_vertical">
    <ImageView 
        android:id="@+id/ImageView01" 
        android:layout_height="24dip" 
        android:layout_width="24dip"/>
</LinearLayout>
<LinearLayout 
    android:id="@+id/LinearLayout01" 
    android:layout_height="48dip" 
    android:layout_width="48dip" 
    android:orientation="horizontal" 

    android:paddingLeft="4dip">
    <LinearLayout 
        android:id="@+id/LinearLayout02" 
        android:layout_height="48dip" android:orientation="vertical" android:layout_width="16dip">

        <TextView 
            android:text="0" 
            android:id="@+id/doc_count" 
            android:textColorHighlight="@color/headline_font" 
            android:layout_gravity="center_vertical" 
            android:textColor="@color/black" 
            android:textSize="12dip" 
            android:layout_margin="0dip" 
            android:padding="0dip" 
            android:paddingTop="0dip" 
            android:gravity="center_vertical|center_horizontal" 
            android:background="@drawable/ico_24_paperclip" 
            android:textStyle="normal" android:layout_height="16dip" android:layout_width="16dip">
        </TextView>
        <ImageView 
            android:id="@+id/prun" 
            android:layout_gravity="center_vertical" 
            android:layout_height="16dip" 
            android:layout_width="16dip" android:background="@drawable/ico_24_prun"/>
        <ImageView 
            android:id="@+id/coord" 
            android:layout_gravity="center_vertical" 
            android:layout_height="16dip" 
            android:layout_width="16dip"       android:background="@drawable/ico_24_coord"/>

    </LinearLayout>
    <ImageView 
            android:id="@+id/img_view" 
            android:layout_gravity="center_vertical" 
            android:layout_height="24dip" 
            android:layout_width="24dip" />

</LinearLayout>
<Button 
    android:id="@+id/button" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:background="@drawable/tabs_edit"
    android:focusable="false"
    android:visibility="gone">
</Button>
<TextView 
    android:layout_gravity="center_vertical" 
    android:padding="2dip" 
    android:marqueeRepeatLimit="2" 
    android:layout_width="wrap_content" 
    android:textSize="22dip" 
    android:textColor="@color/tree_normal_font" 
    android:id="@+id/text_view" 
    android:layout_height="wrap_content">
</TextView>  
</LinearLayout>