Android：实现安卓小程序-记事本(备忘录)的开发，教你如何增加拿到BAT大厂offer几率

public MyBaseAdapter(Context context, List data) {

this.context = context;

this.data = data;

}

@Override

public Object getItem(int i) {

return null;

}

@Override

public long getItemId(int i) {

return 0;

}

@Override

public int getCount() {

if(data==null) return 0;

return data.size();

}

}

接着在编写NoteAdapter类继承上类，初始化view, 将Note条目的各项信息展示出来，其中还自定义了一个viewHolder类，方便对xml文件中的各项组件进行绑定编辑。

public class NoteAdapter extends MyBaseAdapter {

public NoteAdapter(Context context, List data) {

super(context, data);

}

@Override

public View getView(int i, View view, ViewGroup viewGroup) {

ViewHolder viewHolder;

if(view==null){

viewHolder=new ViewHolder();

LayoutInflater inflater = LayoutInflater.from(context);

view = inflater.inflate(R.layout.item_main_list, viewGroup, false);

viewHolder.tv_lv_month = (TextView) view.findViewById(R.id.tv_lv_month);

viewHolder.tv_lv_day= (TextView) view.findViewById(R.id.tv_lv_day);

viewHolder.tv_lv_title = (TextView) view.findViewById(R.id.tv_lv_title);

viewHolder.tv_lv_content = (TextView) view.findViewById(R.id.tv_lv_content);

viewHolder.layout = (LinearLayout) view.findViewById(R.id.Linelayout);

view.setTag(viewHolder);

}

else{

viewHolder = (ViewHolder) view.getTag();

}

viewHolder.tv_lv_month.setText(data.get(i).getUpdate_date().split(“-”)[1]);

viewHolder.tv_lv_day.setText(data.get(i).getUpdate_date().split(“-”)[2]);

viewHolder.tv_lv_title.setText(data.get(i).getTitle());

viewHolder.tv_lv_content.setText(data.get(i).getText());

if(data.get(i).getBackground()!=null){

viewHolder.layout.setBackgroundColor(Color.parseColor(data.get(i).getBackground()));

}

return view;

}

class ViewHolder{

TextView tv_lv_month;

TextView tv_lv_day;

TextView tv_lv_title;

TextView tv_lv_content;

LinearLayout layout;

}

}

3.5 记事本的背景色设置

---

进入到上述提到的编辑模式2中，也就是ContentActivity中，在其底部设置更改背景色功能。这里运用到了会话框的弹出AlertDialog。设置三种颜色。点击确认后，更改数据文件中相应记事条目Note的Background属性。接着进行调用onResume()；使其重新载入数据文件中的记事条目得到背景色的更改。功能截图如下：

| 背景选项 | 设置成功 |

| — | — |

| | |

部分关键代码如下：

ivSettings.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

AlertDialog.Builder builder = new AlertDialog.Builder(ContentActivity.this);

builder.setIcon(R.drawable.fab_settings);

builder.setTitle(“选择一个背景色”);

// 指定下拉列表的显示数据

final String[] colors = {“护眼色”, “薰衣淡紫”, “粉粉粉”};

builder.setItems(colors, new DialogInterface.OnClickListener()

{

@Override

public void onClick(DialogInterface dialog, int which)

{

Toast.makeText(ContentActivity.this, “选择的背景色为：” + colors[which], Toast.LENGTH_SHORT).show();

switch (which){

case 0:

new NoteManager(mContext).updateBackground(title,“#C7EDCC”);

onResume();

break;

case 1:

new NoteManager(mContext).updateBackground(title,“#E6E6FA”);

onResume();

break;

case 2:

new NoteManager(mContext).update