Processamento de eventos do Android com base no monitoramento

1. Interface comum de monitoramento de eventos e método de processamento

Eventos	Interface	Método de tratamento	Explicação
Evento de clique	OnClickListener	onClick （）	Disparado quando o componente é clicado
Evento de clique	OnLongClickListener	onLongClick （）	Disparado quando o componente Changan
Eventos de teclado	OnkeyListener	onKey （）	Lidar com eventos do teclado
Evento de foco	OnFocusChangeListener	onFocusChange	Dispara quando o foco muda
Evento de toque	OnTouchListener	onTouch	Dispara quando o componente é tocado na tela
Editar hora do evento	OnEditorActionListener	onEditorAction	Disparado ao editar

2.Vista o método de registro de ouvinte de evento comum da classe

Método	Explicação
setOnClickListener	Registrar clique em ouvinte de evento
setOnLongClickListener	Registrar ouvinte de eventos de imprensa longa
setOnkeyListener	Registrar ouvinte de eventos do teclado
setOnFocusChangeListener	Registrar ouvinte de evento de foco
setOnTouchListener	Registrar ouvinte de eventos de toque
setOnEditorActionListener	Ouvinte de tempo de atividade de edição registrado

Caso:
Layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="测试文字"
        android:layout_margin="20dp"
        android:layout_gravity="center_horizontal"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="颜色："/>
        <Button
            android:id="@+id/red"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="红色"/>
        <Button
            android:id="@+id/green"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="绿色"/>
        <Button
            android:id="@+id/blue"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="蓝色"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_margin="20dp">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="字体"/>
        <Button
            android:id="@+id/bold"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="粗体"/>
        <Button
            android:id="@+id/italic"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="斜体" />
        <Button
            android:id="@+id/normal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="默认"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_margin="20dp">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="字体大小："/>
        <Button
            android:id="@+id/bigger"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="增大"/>
        <Button
            android:id="@+id/smaller"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="减小"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_margin="20dp">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="内容:"/>
        <EditText
            android:id="@+id/edit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>
</LinearLayout>

Mainatividade:

package com.example.a4_com;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private TextView text;
    private Button red,green,blue,bigger,smaller,bold,italic,naomal;
    private EditText edit;
    private int flot=0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //颜色事件获取组件
     text=(TextView) findViewById(R.id.text);
     red=(Button) findViewById(R.id.red);
     green=(Button)findViewById(R.id.green);
     blue=(Button) findViewById(R.id.blue);
     //实现事件监听器
     InterColour interColour=new InterColour();
     //注册事件监听器
     red.setOnClickListener(interColour);
     green.setOnClickListener(interColour);
     blue.setOnClickListener(interColour);
      //文字大小事件
     bigger=(Button) findViewById(R.id.bigger);
     smaller=(Button) findViewById(R.id.smaller);
     OuterTypeface outerTypeface=new OuterTypeface();
     bigger.setOnClickListener(outerTypeface);
     smaller.setOnClickListener(outerTypeface);
     //字体样式事件
     bold=(Button) findViewById(R.id.bold);
     italic=(Button) findViewById(R.id.italic);
     naomal=(Button) findViewById(R.id.normal);
      bold.setOnClickListener(this);
      italic.setOnClickListener(this);
      naomal.setOnClickListener(this);
      //编辑框文件
     edit=(EditText) findViewById(R.id.edit);
     //4.匿名内部类
     edit.setOnEditorActionListener(new TextView.OnEditorActionListener() {
         @Override
         public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
             text.setText(edit.getText().toString().trim());
             return true;
         }
     });
    }
    //1.定义内部类
    public class InterColour implements View.OnClickListener{
        @Override
        public void onClick(View v) {
            switch (v.getId()){
                case R.id.red:
                    text.setTextColor(Color.RED);
                    break;
                case R.id.green:
                    text.setTextColor(Color.GREEN);
                    break;
                case R.id.blue:
                    text.setTextColor(Color.BLUE);
                    break;
                default:
                    break;
            }
        }
    }
    //3.使用类自身继承
  //flot=0 默认 flot=1加粗 flot=2 倾斜  flot=3加粗又倾斜
    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.bold:
                if(flot==2||flot==3){
                   text.setTypeface(Typeface.MONOSPACE,Typeface.BOLD_ITALIC);
                   flot=3;
                } else{
                    text.setTypeface(Typeface.MONOSPACE,Typeface.BOLD);
                    flot=1;
                }break;
            case R.id.italic:
                if (flot==1||flot==3){
                    text.setTypeface(Typeface.MONOSPACE,Typeface.BOLD_ITALIC);
                     flot=3;
                }else {
                    text.setTypeface(Typeface.MONOSPACE,Typeface.ITALIC);
                    flot=2;
                }break;
            case R.id.normal:
                text.setTypeface(Typeface.MONOSPACE,Typeface.NORMAL);
                flot=0;
                break;
            default:
                break;
        }


    }

}

2. Classe externa:

package com.example.a4_com;

import android.view.View;
import android.widget.TextView;

public class OuterTypeface implements View.OnClickListener {
    private TextView text;
    private  float size=10;
    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.bigger:
                size+=4;
                break;
            case R.id.smaller:
                size-=4;
                break;
            default:
                break;
        }
        if (size>=72){
            size=72;
        if (size<=4) {
            size = 4;
        }
        }
    }
}