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java - 单击按钮时未在同一项目中切换帐户

问题描述

这是一个关于布局的应用程序，首先屏幕将在单击按钮时处于纵向布局，它将更改为横向布局。因此，在单击按钮时，尽管没有发现编译错误，但它不会进入下一个活动

activity_main.xml

?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="com.example.vamshivikas.orientation.MainActivity">

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="28dp"
    android:text="@string/this_is_potrait_layout"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.48"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.15" />

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="47dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="80dp"
    android:layout_marginEnd="8dp"
    android:layout_marginBottom="8dp"
    android:text="@string/go_to_next_activity"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView" />

</android.support.constraint.ConstraintLayout>

activity_second.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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">

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginBottom="8dp"
    android:text="@string/this_is_landscape_layout"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

活动清单.xml

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

<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="com.example.vamshivikas.orientation.MainActivity"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
           <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
    </activity>

           <activity android:name=".SecondActivity"
               android:screenOrientation="landscape">

    </activity>
</application>

</manifest>

mainActivity.java

package com.example.vamshivikas.orientation;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;


public class MainActivity extends AppCompatActivity {
Button button1;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button1=(Button)findViewById(R.id.button1);
}
public void onClcik(View v){
    Intent intent=new Intent(MainActivity.this,SecondActivity.class);
    startActivity(intent);
}

secondActivity.java

package com.example.vamshivikas.orientation;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class SecondActivity extends AppCompatActivity{
@Override
protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);
}
}

标签： javaandroid

解决方案

如我所见，activity_main.xml 中的 Button-Element 中没有 onClick-Attribute。像这样给你的按钮一个 onClick 属性

<Button
android:onClick="onButtonNextActivityClick"
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="47dp"
android:layout_marginStart="8dp"
android:layout_marginTop="80dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="@string/go_to_next_activity"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />

然后在 MainActivity.java 中创建一个具有相同名称的公共 void 方法并在其中处理您的东西。像这样：

public void onButtonNextActivityClick(View v){
    Intent intent = new Intent(MainActivity.this,SecondActivity.class);
    startActivity(intent);
}

并考虑使用 MrFishermans 解决方案

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