Android学习之页面跳转

1、在layout下创建一个skip_layout.xml文件：（该文件用来测试页面跳转）

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".SkipActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="跳转的界面!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

2、编写SkipActivity.java文件，修改启动的界面为skip_layout

package com.example.togglepages;

import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;

public class SkipActivity extends AppCompatActivity {

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

3、编辑好SkipActivity.java文件后，要在AndroidMainifest.xml里面注册SkipActivity，注册的代码如下

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.togglepages">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity android:name=".SkipActivity">

        </activity>
    </application>

</manifest>

4、在layout下创建begin_layout.xml并且添加按钮等组件，用来实现点击后跳转界面。

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:background="@mipmap/b"
    tools:context=".MainActivity">


    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:layout_marginBottom="33dp"
        android:text="按钮2"
        android:background="#1c97f5"
        app:layout_constraintBottom_toTopOf="@+id/button2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="110dp"
        android:text="按钮1"
        android:background="#1c97f5"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="@+id/btn"
        app:layout_constraintTop_toBottomOf="@+id/btn" />

</androidx.constraintlayout.widget.ConstraintLayout>

5、添加了按钮后，修改MainActivity.java文件，在onCreate中获取刚刚在界面文件中添加的按钮，并且实现点击事件监听。并在事件触发处理函数中添加界面跳转的代码，实现界面跳转使用了Intent，具体的代码如下

package com.example.togglepages;

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 {

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

        Button btn=findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                Intent it=new Intent();
                it.setClass(MainActivity.this,SkipActivity.class);
                        MainActivity.this.startActivity(it);

            }
        });
    }
}