每日总结 3.10

今天学习了按键的操作。

首先是按键的点击事件：

package com.example.dongnao;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.text.BreakIterator;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    private TextView textView;
    private TextView textview2;

    @SuppressLint("MissingInflatedId")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = findViewById(R.id.tv_result);
        Button button=findViewById(R.id.btn_click_single);
        Button button1=findViewById(R.id.btn_long_click);
        textview2=findViewById(R.id.tv_results);
        button.setOnClickListener(this);
        button1.setOnLongClickListener(view -> {
                    String desc=String .format("%s 你点击了按钮：%s", DateUtil.getNowTime(),((Button) view).getText());
                    textview2.setText(desc);
           return true;
        }
        );

    }
    public  void onClick(View view){
        if(view.getId()==R.id.btn_click_single){
            String desc=String .format("%s 你点击了按钮：%s", DateUtil.getNowTime(),((Button) view).getText());
            textView.setText(desc);
        }
     }
    /*static class MyOnClickListener implements View.OnClickListener{
        private final TextView textView;

        public MyOnClickListener(TextView textView){
            this.textView=textView;
        }

        @Override
        public void onClick(View view) {
            String desc=String .format("%s 你点击了按钮：%s", DateUtil.getNowTime(),((Button) view).getText());
            textView.setText(desc);
        }
    }*/
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn_click_single"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="指定监听"
        android:textColor="#000000"
        android:textSize="15sp"
        />
    <TextView
        android:id="@+id/tv_result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:gravity="center"
        android:text="查看结果"
        android:textColor="#000000"
        android:textSize="15sp"
        />
    <Button
        android:id="@+id/btn_long_click"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="长按指定监听"
        android:textColor="#000000"
        android:textSize="15sp"
        />
    <TextView
        android:id="@+id/tv_results"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:gravity="center"
        android:text="查看结果"
        android:textColor="#000000"
        android:textSize="15sp"
        />


</LinearLayout>

而后是按键的启用和禁用：

package com.example.dongnao;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class BUttonEnable extends AppCompatActivity implements View.OnClickListener {

    private Button btn_test;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_button_enable);
        Button btn_enable= findViewById(R.id.btn_enable);
        Button btn_disable= findViewById(R.id.btn_disable);
        btn_test = findViewById(R.id.btn_test);
        TextView tv_result=findViewById(R.id.tv_resultse);


        btn_enable.setOnClickListener(this);
        btn_disable.setOnClickListener(this);
        btn_test.setOnClickListener(this);
    }

    @SuppressLint("NonConstantResourceId")
    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.btn_enable:
                btn_test.setEnabled(true);
                btn_test.setTextColor(Color.BLACK);
                break;
            case R.id.btn_disable:
                btn_test.setEnabled(false);
                btn_test.setTextColor(Color.GREEN);
                break;
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >

        <Button
            android:id="@+id/btn_enable"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="启用按钮"
            android:textColor="#000000"
            android:textSize="17dp"
            />
        <Button
            android:id="@+id/btn_disable"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="禁用按钮"
            android:textColor="#000000"
            android:textSize="17dp"
            />

    </LinearLayout>
    <Button
        android:id="@+id/btn_test"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="测试按钮"
        android:textColor="#888888"
        android:textSize="17dp"
        android:enabled="false"
        />

    <TextView
        android:id="@+id/tv_resultse"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="查看点击结果"/>

</LinearLayout>