TextView和Button的学习

常用属性，界面跳转，按钮学习，按压颜色的变换，图片的插入学习等

工程目录：

MainActivity.java:

package com.example.revrse;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class MainActivity extends AppCompatActivity {

   private Button mBtnEditText;

   private Button mBtnTextView;

   private Button mBtnButton;

    @Override

    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演示界面

                Intent intent=new Intent(MainActivity.this,TextViewActivity.class);

                startActivity(intent);

            }

        });

        mBtnButton=findViewById(R.id.btn_button);

        mBtnButton.setOnClickListener(new View.OnClickListener(){

            @Override

            public void onClick(View v){

                //跳转到Button演示界面

                Intent intent=new Intent(MainActivity.this,ButtonActivity.class);

                startActivity(intent);

            }

        });

    }

}

activity_main.xml:

<?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"

    tools:context=".MainActivity">

    <Button

        android:id="@+id/btn_textview"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:textColor="#000000"

        android:text="TextView"/>

    <Button

        android:id="@+id/btn_button"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:textColor="#000000"

        android:text="Button"/>

</LinearLayout>

TextViewActivity.java:

package com.example.revrse;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Paint;

import android.os.Bundle;

import android.widget.TextView;

public class TextViewActivity extends AppCompatActivity {

   private TextView mTv3;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_text_view);

        mTv3=(TextView)findViewById(R.id.tv_3);

        mTv3.getPaint().setFlags(Paint.STRIKE_THRU_TEXT_FLAG);//中划线

        mTv3.getPaint().setAntiAlias(true);//去掉锯齿

    }

}

activity_text_view.xml:

<?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"

    tools:context=".TextViewActivity">

    <TextView

        android:id="@+id/tv_1"

        android:layout_width="100dp"

        android:layout_height="wrap_content"

        android:maxLines="1"

        android:ellipsize="end"

        android:text="软件工程"

        android:textColor="#000000"

        android:textSize="24sp"

        android:layout_marginTop="10dp"/>

    <TextView

        android:id="@+id/tv_2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="图片"

        android:drawableRight="@drawable/picture"

        android:textSize="24sp"

        android:layout_marginTop="10dp" />

    <TextView

        android:id="@+id/tv_3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="中划线"

        android:textColor="#000000"

        android:textSize="24sp"

        android:layout_marginTop="20dp"/>

        </LinearLayout>

ButtonActivity.java:

package com.example.revrse;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class ButtonActivity extends AppCompatActivity {

 private Button mBtn2;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_button);

        mBtn2=findViewById(R.id.btn_2);

        mBtn2.setOnClickListener(new View.OnClickListener(){

            @Override

            //弹出语句框方法一

            public void onClick(View v){

                Toast.makeText(ButtonActivity.this,"按钮2被点击了",Toast.LENGTH_SHORT).show();

            }

        });

    }

    public void showToast(View view){

        //弹出语句框

        //Toast.makeText(this,"点击",Toast.LENGTH_SHORT).show();//方法二

    }

}

activity_button.xml:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout 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=".ButtonActivity">

    <Button

        android:id="@+id/btn_1"

        android:layout_width="match_parent"

        android:layout_height="80dp"

        android:text="按钮1"

        android:textSize="20sp"

        android:textColor="#ffffff"

        android:background="#ff0000"/>

    <Button

        android:id="@+id/btn_2"

        android:layout_width="match_parent"

        android:layout_height="80dp"

        android:text="按钮2（按压变色）"

        android:textSize="20sp"

        android:textColor="#00ff33"

        android:background="#ffff00"

        android:layout_below="@+id/btn_1"

        android:onClick="showToast"

        android:layout_marginTop="10dp"

        tools:ignore="OnClick" />

</RelativeLayout>

.res.drawable

bg_button2.xml:(弹出语句框）

<?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="#ff9900"/>

            <corners android:radius="5dp"/>

        </shape>

    </item>

    <item android:state_pressed="false">

        <shape>

            <solid android:color="#ff9900"/>

            <corners android:radius="5dp"/>

        </shape>

    </item>

</selector>

运行截图：

巴特西

TextView和Button的学习

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