BaseAdapter結合ListView_實現多佈局

項目理解：
1.聊天氣泡使用padding填充和margin屬性設置邊距
2.當我們在使用工具類的時候，如果不想在類中的方法做具體實現那麼就可以寫一個抽象方法，在使用的時候做具體的實現，這樣可以大大增加工具類的複用性

點擊查看RecyclerView萬能適配器實現多佈局
大體的效果

1.適配器

abstract class Myadapter<T> extends BaseAdapter {
    int[] layouts;
    ArrayList<T> arrayList;
    Context context;

    public Myadapter(int[] layouts, ArrayList<T> arrayList, Context context) {
        this.layouts = layouts;
        this.arrayList = arrayList;
        this.context = context;
    }
    public void setArrayList(ArrayList<T> arrayList) {
        this.arrayList = arrayList;
    }
    @Override
    public int getCount() {
        return arrayList.size();
    }

    @Override
    public Object getItem(int position) {
        return arrayList.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
    //將具體實現寫在外面
        return setView(position,convertView,parent);
    }
    public abstract View setView(int position, View convertView, ViewGroup parent);
};

2.Activity代碼

//需要的佈局放進數組
int[] layouts=new int[]{R.layout.you,R.layout.zuo};
myadapter = new Myadapter<Info>(layouts, infos, this) {
    @Override
    public View setView(int position, View convertView, ViewGroup parent) {
        View view=null;
        if (getItemViewType(position) == 0) {
            view = View.inflate(parent.getContext(), layouts[0], null);
            convertView=setMyViewText(R.id.youtext, infos.get(position).text,view);
        } else {
            view = View.inflate(parent.getContext(), layouts[1], null);
            convertView=setMyViewText(R.id.zuotext, infos.get(position).text,view);
        }
        return convertView;
    }
    //這個方法返回的是類型
    @Override
    public int getItemViewType(int position) {
        return infos.get(position).type;
    }
};
listView.setAdapter(myadapter);

3.封裝的數據類

class Info{
    String text;
    int type;

    public Info(String text, int type) {
        this.text = text;
        this.type = type;
    }
};

4.點擊按鈕發送需要執行的代碼

send.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        infos.add(new Info(chat.getText().toString(),0));
        infos.add(new Info(infos.get((int)(Math.random()*infos.size()-1)).text,1));
        //數據源改變
        myadapter3.setArrayList(infos);
        //刷新適配器
        myadapter3.notifyDataSetChanged();
        //設置ListView顯示的是最後一行
        listView.setSelection(infos.size()-1);
    }
});