使用方法

1. 因为使用了jdk8的一些特性，需要在module的build.gradle里添加如下配置：

//纯java的项目
android {
	compileOptions {
		sourceCompatibility JavaVersion.VERSION_1_8
		targetCompatibility JavaVersion.VERSION_1_8
	}
}

//有kotlin的项目还需要在project的build.gradle里添加
allprojects {
    tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8

        kotlinOptions {
            jvmTarget = '1.8'
            apiVersion = '1.3'
            languageVersion = '1.3'
        }
    }
}

2. module的build.gradle中的添加依赖，自行修改为最新版本，同步后通常就可以用了：

dependencies {
	...
	implementation 'cn.wandersnail:tree-listadapter:latestVersion'
}

3. 如果从jcenter下载失败。在project的build.gradle里的repositories添加内容，最好两个都加上，添加完再次同步即可。

allprojects {
	repositories {
		...
		mavenCentral()
		maven { url 'https://dl.bintray.com/wandersnail/androidx/' }
	}
}

代码托管

效果图

支持多层级，条目内容自定义。

1.定义数据模型

private class Item extends Node<Item> {
    String name;

    Item(int id, int pId, int level, boolean isExpand, String name) {
        super(id, pId, level, isExpand);
        this.name = name;
    }
}

2.继承TreeAdapter自己实现条目内容

private class MyAdapter extends TreeListAdapter<Item> {
    MyAdapter(ListView lv, List<Item> nodes) {
        super(lv, nodes);
    }

    @Override
    public int getViewTypeCount() {
        return super.getViewTypeCount() + 1;
    }

    /**
     * 获取当前位置的条目类型
     */
    @Override
    public int getItemViewType(int position) {
        if (getItem(position).hasChild()) {
            return 1;
        }
        return 0;
    }
    
    @Override
    protected Holder<Item> getHolder(int position) {
        switch(getItemViewType(position)) {
            case 1:
                return new Holder<Item>() {
                    private ImageView iv;
                    private TextView tv;

                    @Override
                    public void onBind(Item node) {
                        iv.setVisibility(node.hasChild() ? View.VISIBLE : View.INVISIBLE);
                        iv.setBackgroundResource(node.isExpand ? R.mipmap.expand : R.mipmap.fold);
                        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) iv.getLayoutParams();
                        params.leftMargin = (node.level + 1) * dip2px(20);
                        iv.setLayoutParams(params);
                        tv.setText(node.name);
                    }

                    @Override
                    public View createView() {
                        View view = View.inflate(MainActivity.this, R.layout.item_tree_list_has_child, null);
                        iv = (ImageView) view.findViewById(R.id.ivIcon);
                        tv = (TextView) view.findViewById(R.id.tvName);
                        return view;
                    }
                };
            default:
                return new Holder<Item>() {
                    private TextView tv;
                    
                    @Override
                    public void onBind(Item node) {
                        tv.setText(node.name);
                        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) tv.getLayoutParams();
                        params.leftMargin = (node.level + 3) * dip2px(20);
                        tv.setLayoutParams(params);
                    }

                    @Override
                    public View createView() {
                        View view = View.inflate(MainActivity.this, R.layout.item_tree_list_no_child, null);
                        tv = (TextView) view.findViewById(R.id.tvName);
                        return view;
                    }
                };
        }
    }
}

3.设置适配器数据源

List<Item> list = new ArrayList<>();
list.add(new Item(0, 0, 0, true, "Android"));
list.add(new Item(1, 0, 1, false, "Service"));
list.add(new Item(2, 0, 1, false, "Activity"));
list.add(new Item(3, 0, 1, false, "Receiver"));
list.add(new Item(4, 0, 0, false, "Java Web"));
list.add(new Item(5, 4, 1, false, "CSS"));
list.add(new Item(6, 4, 1, false, "Jsp"));
list.add(new Item(7, 4, 1, false, "Html"));
list.add(new Item(8, 7, 2, false, "p"));
final MyAdapter adapter = new MyAdapter(lv, list);
adapter.setOnInnerItemClickListener(new TreeAdapter.OnInnerItemClickListener<Item>() {
    @Override
    public void onClick(Item node) {
        Toast.makeText(MainActivity.this, "click: " + node.name, Toast.LENGTH_SHORT).show();
    }
});
adapter.setOnInnerItemLongClickListener(new TreeAdapter.OnInnerItemLongClickListener<Item>() {
    @Override
    public void onLongClick(Item node) {
        Toast.makeText(MainActivity.this, "long click: " + node.name, Toast.LENGTH_SHORT).show();
    }
});
new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
        list.add(new Item(9, 7, 2, false, "a"));
        adapter.notifyDataSetChanged();
    }
}, 2000);