Android

Button是Textview 的子类

自己定义按钮形状

Drawable-new drawable resource file-root element(shape)-bg_btn2
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid//填充
android:color="#FF9900"/>
<stroke//描边
android:width="1dp"
Android:color="FFFFFF"/>
<corners//圆角
android:radius="20dp"/>
</shape>
然后在layout中
android:background="@drawable/bg_btn2"

按压效果

Drawable-new drawable resource file-root element(selector)-bg_btn3
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape>
<solid android:color="#03A9F4"/>
<corners android:radius="10dp"/>
</shape>
</item>
<item android:state_pressed="false">
<shape>
<solid android:color="#009688"/>
<corners android:radius="10dp"/>
</shape>
</item>
</selector>

点击事件

1. 方法1：
在activity中
public void showToast(View view){
Toast.makeText(this,"我被点击了",Toast.LENGTH_SHORT).show();
}
在layout中
android:onClick="showToast"
2. 方法2：
mBtn2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(ButtonActivity.this,"我也被点击了",Toast.LENGTH_SHORT).show();
}
});

更新不了的时候，把代理去掉。

一行显示不下，以……代替

Android:maxline="1"
Android：ellipsize=“end”

右侧添加图片（在layout中就可以了）

android:drawableRight="@drawable/a2"

在activity中给文本添加中划线/下划线

mTv2.getPaint().setFlags(Paint.STRIKE_THRU_TEXT_FLAG);//中划线
mTv2.getPaint().setFlags(Paint.UNDERLINE_THRU_TEXT_FLAG);//下划线

去除锯齿

mTv2.getPaint().setAntiAlias(true);

界面跳转

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mBtnTextView=findViewById(R.id.btn_textview);
mBtnTextView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//跳转到TextView界面
Intent intent=new Intent(MainActivity.this,TextViewActivity.class);
startActivity(intent);
}

跑马灯效果

<TextView
android:id="@+id/tv_4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="mTv2.getPaint().setFlags(Paint.UNDERLINE_THRU_TEXT_FLAG);//下划线"
android:textSize="24sp"
android:singleLine="true"
android:ellipsize="marquee"
android:marqueeRepeatLimit="marquee_forever"
android:focusable="true"
android:focusableInTouchMode="true"
/>

 EditText

<EditText
android:id="@+id/et_2"
android:layout_width="match_parent"
android:layout_height="50dp"
android:textColor="#FFC107"
android:layout_below="@id/et_1"
android:layout_marginTop="10dp"
android:textSize="20sp"
android:drawableLeft="@drawable/passwor"
android:drawablePadding="10dp"
android:hint="密码"
android:maxLength="1"
android:inputType="textPassword"*显示
android:inputType="number" 呼出数字键
android:background="@drawable/bg_username"
android:paddingLeft="10dp"
/>
监控EditText输入（可以再LogCat中看到输入）
mEtUserName=findViewById(R.id.et_1);
mEtUserName.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {

}

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.d("edittext",s.toString());
}

@Override
public void afterTextChanged(Editable s) {

}

 RadioButton

<RadioGroup

android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/rg_1"
android:padding="15dp">
<RadioButton
android:id="@+id/rb_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="男"
android:checked="true"//默认选中要加ID
android:textSize="12sp"
android:textColor="#9C27B0"
/>
<RadioButton
android:id="@+id/rb_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女"
android:textSize="12sp"
android:textColor="#9C27B0"
/>
</RadioGroup>

页面跳转

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mBtnTextView=findViewById(R.id.btn_textview);
mBtnButton=findViewById(R.id.btn_button);
mBtnEditText=findViewById(R.id.btn_edittext);
mBtnRadioButton=findViewById(R.id.btn_radiobutton);
setListeners();
}
private void setListeners(){
OnClick onClick=new OnClick();
mBtnTextView.setOnClickListener(onClick);
mBtnButton.setOnClickListener(onClick);
mBtnEditText.setOnClickListener(onClick);
mBtnRadioButton.setOnClickListener(onClick);
}
private class OnClick implements View.OnClickListener{
public void onClick(View v){
Intent intent=null;
switch (v.getId()){
case R.id.btn_textview:
intent=new Intent(MainActivity.this,TextViewActivity.class);
//跳转TextView演示界面
break;
case R.id.btn_button:
intent=new Intent(MainActivity.this,ButtonActivity.class);
//跳转TextView演示界面
break;
case R.id.btn_edittext:
intent=new Intent(MainActivity.this,EditTextActivity.class);
//跳转TextView演示界面
break;
case R.id.btn_radiobutton:
intent=new Intent(MainActivity.this,RadioButtonActivity.class);
//跳转TextView演示界面
break;
}
startActivity(intent);
}
}

在layout中添加listview.xml

<ListView
    android:id="@+id/lv_1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:listSelector="@drawable/list_item"//设置选中或未选中时的背景颜色
    ></ListView>

创建一个MyListAdapter

public class MyListAdapter extends BaseAdapter {
//适配器
    private Context mContext;
    private LayoutInflater mLayoutInflater;

    public MyListAdapter(Context context){
        this.mContext=context;
        mLayoutInflater=LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return 10;//一般不是固定值
    }

    static  class ViewHolder{
        //提高复用？
        public ImageView imageView;
        public TextView tvTitle, tvTime, tvContent;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView==null){
            convertView=mLayoutInflater.inflate(R.layout.layout_list_item,null);//单写一个layout_list_item设定每个view的格式
            holder= new ViewHolder();
            holder.imageView=convertView.findViewById(R.id.iv);
            holder.tvContent=convertView.findViewById(R.id.tv_content);
            holder.tvTime=convertView.findViewById(R.id.tv_time);
            holder.tvTitle=convertView.findViewById(R.id.tv_title);
            convertView.setTag(holder);
        }else{
            holder=(ViewHolder) convertView.getTag();
        }
        //给控件赋值
        holder.tvTitle.setText("这是标题");
        holder.tvTime.setText("2019.12.28");
        holder.tvContent.setText("这是内容啊，5555");
        Glide.with(mContext).load("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1577515195713&di=b9d28fc56629712f88c19c3b52a9a734&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201802%2F14%2F20180214135722_WJefw.jpeg").into(holder.imageView);
        return convertView;
    }
}

在LisviewActivity中用适配器

mLv1.setAdapter(new MyListAdapter(ListViewActivity.this));
设置点击/长按事件
mLv1.setOnItemLongClickListener(new OnItemLongClickListener(){

    @Override
    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(ListViewActivity.this,"长按pos"+position,Toast.LENGTH_SHORT).show();
        return true;//不会出现长按之后还有短按的效果
    }
});