前言

多年前曾经自学过Android基础，但是没用过几次就忘了，如今因工作需要重新捡起来，因此记录下自己学习的系统化路径，以此增强自己的学习记忆。

控件相关

1.TextView 文本框

系统属性

简单实现一个跑马灯代码 Xml部分

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

    <com.kowaii.demo1.MyMarqueeTextView
        android:id="@+id/tv_one"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:text="@string/tv_one"   
        android:textSize="55sp"
        android:textStyle="italic"
        android:textColor="@color/black" 
        android:gravity="center"

        android:shadowColor="@color/red"
        android:shadowRadius="3.0"
        android:shadowDx="10.0"
        android:shadowDy="10.0"

        android:singleLine="true"
        android:ellipsize="marquee"
        android:marqueeRepeatLimit="marquee_forever"
        android:focusable="true"
        android:focusableInTouchMode="true"



        ></com.kowaii.demo1.MyMarqueeTextView>
</LinearLayout>

自定义View代码部分

package com.kowaii.demo1;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.TextView;

import androidx.annotation.Nullable;

public class MyMarqueeTextView extends androidx.appcompat.widget.AppCompatTextView {

    public MyMarqueeTextView(Context context) {
        super(context);
    }

    public MyMarqueeTextView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public MyMarqueeTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public boolean isFocused() {
        return true;
    }
}

2.Button 按钮

package com.kowaii.demo1;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    public static final String Tag = "hako";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


//        TextView tv_one = findViewById(R.id.tv_one);
        Button btn_one = findViewById(R.id.btn_one);

        //点击事件
        btn_one.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View view) {
                Log.e(Tag,"onClick:");
            }
        });

        //长按事件
        btn_one.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                Log.e(Tag,"onLongClick");
                return false;
            }
        });

        //触摸事件
        btn_one.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                Log.e(Tag,"onTouch" + motionEvent.getAction());
                return false;
            }
        });
    }
}

3.EditText 输入框

结合输出框和按钮 实现获取输出框文本内容

XML

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

    <EditText
        android:id="@+id/edt_account"
        android:hint="请输入账户"
        android:textColorHint="#FF666666"
        android:drawableLeft="@drawable/ic_baseline_account_balance_24"
        android:drawablePadding="10dp"
        android:paddingLeft="24dp"
        android:layout_width="200dp"
        android:inputType="number"
        android:background="@color/white"
        android:layout_height="100dp"></EditText>

    <EditText
        android:id="@+id/edt_pwd"
        android:hint="请输入密码"
        android:textColorHint="#FF666666"
        android:drawableLeft="@drawable/ic_baseline_accessibility_24"
        android:drawablePadding="10dp"
        android:paddingLeft="24dp"
        android:layout_width="200dp"
        android:inputType="numberPassword"
        android:background="@color/white"
        android:layout_height="100dp"></EditText>

        <Button
            android:id="@+id/btn_one"
            android:layout_width="200dp"
            android:layout_height="100dp"
            android:text="我是按钮"
            android:layout_gravity="center"
         ></Button>


</LinearLayout>

代码部分

package com.kowaii.demo1;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    public static final String Tag = "hako";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button btn_one = findViewById(R.id.btn_one);

        //点击事件
        btn_one.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View view) {

                EditText edt_acc = findViewById(R.id.edt_account);
                EditText edt_pwd = findViewById(R.id.edt_pwd);

                Log.e(Tag,"onClick:" + "account = " + edt_acc.getText().toString() + " pwd = " + edt_pwd.getText().toString());
            }
        });

        //长按事件
        btn_one.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                Log.e(Tag,"onLongClick");
                return false;
            }
        });

        //触摸事件
        btn_one.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                Log.e(Tag,"onTouch" + motionEvent.getAction());
                return false;
            }
        });
    }
}