1.几个控件
- ProgressBar横向
<ProgressBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
android:max="100"
android:progress="20"
/>
- ProgressDialog 对话框进度条
2.几个布局
-
相对布局中：
layout_alignParentTop，layout_alignParentBottom …… layout_centerInParent 相对父布局，上下左右中。<b/>
layout_above …… 相对于控件上下左右 -
gradle引包，使用百分比布局
3.简单自定义一个标题栏
- how ?
public class MyTitle extends LinearLayout {
private TextView title_tv;
public MyTitle(Context context, AttributeSet attrs) {
super(context, attrs);
LayoutInflater.from(context).inflate(R.layout.mytitle,this);
findViewById(R.id.back_btn).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
((Activity)getContext()).finish();
}
});
findViewById(R.id.setting_btn).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
}
});
title_tv= (TextView) findViewById(R.id.title_tv);
}
public void setTitle(String titleTxt){
title_tv.setText(titleTxt);
}
}
- to use
<com.study.dh.lockapp.myview.MyTitle
android:id="@+id/title_mt"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</com.study.dh.lockapp.myview.MyTitle>
private MyTitle title_mt;
……
title_mt= (MyTitle) findViewById(R.id.title_mt);
title_mt.setTitle("登陆");
……
4. RecycleListView的使用
- 简单使用
- 横向展示
- 瀑布流显示 可用于展示不同大小的item
StaggeredGridLayoutManager staggeredGridLayoutManager=new
StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);
// LinearLayoutManager linearLayoutManager=new LinearLayoutManager(this);
// linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL); //横向滚动
fruit_rv.setLayoutManager(staggeredGridLayoutManager);
- 点击事件
public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {
private List<Fruit> fruitList;
public FruitAdapter(List<Fruit> fruitList) {
this.fruitList = fruitList;
}
@Override
public FruitAdapter.ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_horizontal_item,parent,false);
final ViewHolder holder=new ViewHolder(view);
holder.fruitView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int position=holder.getAdapterPosition();
Fruit fruit=fruitList.get(position);
Toast.makeText(view.getContext(),"click item"+fruit.getName(),Toast.LENGTH_SHORT).show();
}
});
holder.fruitImag.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int position=holder.getAdapterPosition();
Fruit fruit=fruitList.get(position);
Toast.makeText(view.getContext(),"click img"+fruit.getName(),Toast.LENGTH_SHORT).show();
}
});
return holder;
}
@Override
public void onBindViewHolder(FruitAdapter.ViewHolder holder, int position) {
Fruit fruit=fruitList.get(position);
holder.fruitTxt.setText(fruit.getName());
holder.fruitImag.setImageResource(fruit.getImgId());
}
@Override
public int getItemCount() {
return fruitList.size();
}
static class ViewHolder extends RecyclerView.ViewHolder {
View fruitView;
ImageView fruitImag;
TextView fruitTxt;
public ViewHolder(View itemView) {
super(itemView);
fruitView=itemView;
fruitImag= (ImageView) itemView.findViewById(R.id.fruitImg);
fruitTxt= (TextView) itemView.findViewById(R.id.fruitTxt);
}
}
}
注： RecyclerView的可以轻松实现子项中任意空间或布局的点击事件
5.实例--聊天界面的编写
-
Nine-Patch图片的制作：android -sdk下的tool工具，打开Nine-Patch制作图片即可。
-
recycleview刷新发送消息, 增加数据，和定位光标 ，清空输入框
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.sendmsg_btn:
String content=input_et.getText().toString();
if (!content.equals("")){
Random random=new Random();
Msg msg=new Msg(content,random.nextInt(2));
msgs.add(msg);
msgAdapter.notifyItemInserted(msgs.size()-1); //刷新新消息
fruit_rv.scrollToPosition(msgs.size()-1); //将recycleview定位到最后一行
input_et.setText("");
}
break;
}
}
- adapter 做个消息类型的区分即可
public class MsgAdapter extends RecyclerView.Adapter<MsgAdapter.ViewHolder> {
private List<Msg> list;
public MsgAdapter(List<Msg> list) {
this.list = list;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.msg_item,parent,false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Msg msg=list.get(position);
if (msg.getType()==Msg.TYPE_RECEIVED){
holder.right_layout.setVisibility(View.GONE);
holder.left_layout.setVisibility(View.VISIBLE);
holder.leftMsg_tv.setText(msg.getContent());
}else if (msg.getType()==Msg.TYPE_SEND){
holder.right_layout.setVisibility(View.VISIBLE);
holder.left_layout.setVisibility(View.GONE);
holder.rightMsg_tv.setText(msg.getContent());
}
}
@Override
public int getItemCount() {
return list.size();
}
static class ViewHolder extends RecyclerView.ViewHolder{
LinearLayout right_layout;
LinearLayout left_layout;
TextView rightMsg_tv;
TextView leftMsg_tv;
public ViewHolder(View itemView) {
super(itemView);
right_layout= (LinearLayout) itemView.findViewById(R.id.right_layout);
left_layout= (LinearLayout) itemView.findViewById(R.id.left_layout);
rightMsg_tv= (TextView) itemView.findViewById(R.id.rightMsg_tv);
leftMsg_tv= (TextView) itemView.findViewById(R.id.leftMsg_tv);
}
}
}
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