如何在android中实现同一个activity中的两个按钮？

Question

我的初始 activity 中有两个按钮，每个按钮在单击时都需要移动到不同的 activity。第一个按钮似乎工作正常，但第二个按钮只是停止了整个应用程序。我已经尝试实施此处发布的所有解决方案，但似乎没有任何效果。

MainActivity.java

package com.example.fryselectronics.knowyourbooks;

import android.content.Context;
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 ab;
Button ba;
Intent intent;
Intent intentt;

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







    ab=(Button)findViewById(R.id.button2);
    final Intent intent= new Intent();
    intent.setClass(MainActivity.this, Main2Activity.class);

    ab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


            startActivity(intent);

        }

    });
    ba=(Button)findViewById(R.id.button);
    final Intent intentt= new Intent();
    intentt.setClass(MainActivity.this, Main6Activity.class);

    ba.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


                    startActivity(intentt);


            }

    });

}

}

activity_main.xml

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="@drawable/a"
tools:context="com.example.fryselectronics.knowyourbooks.MainActivity">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="Click on any one of the data sets from below"
    android:id="@+id/textView"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true" />

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="B"
    android:id="@+id/button"
    android:layout_centerVertical="true" />

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="A"
    android:id="@+id/button2"
    android:layout_above="@+id/button"
    android:layout_alignParentStart="true"
    android:layout_marginBottom="40dp"
    android:layout_alignEnd="@+id/button" />

AndroidManifest.xml

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

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    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=".Main2Activity" />

    <activity android:name=".Main6Activity"></activity>
</application>

日志：

03-25 22:25:24.410 32470-32470/com.example.fryselectronics.knowyourbooks E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                       Process: com.example.fryselectronics.knowyourbooks, PID: 32470
                                                                                       android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.fryselectronics.knowyourbooks/com.example.fryselectronics.knowyourbooks.Main6Activity}; have you declared this activity in your AndroidManifest.xml?
                                                                                           at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1885)
                                                                                           at android.app.Instrumentation.execStartActivity(Instrumentation.java:1579)
                                                                                           at android.app.Activity.startActivityForResult(Activity.java:3921)
                                                                                           at android.app.Activity.startActivityForResult(Activity.java:3881)
                                                                                           at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:843)
                                                                                           at android.app.Activity.startActivity(Activity.java:4208)
                                                                                           at android.app.Activity.startActivity(Activity.java:4176)
                                                                                           at com.example.fryselectronics.knowyourbooks.MainActivity.onClick(MainActivity.java:51)
                                                                                           at android.view.View.performClick(View.java:5201)
                                                                                           at android.view.View$PerformClick.run(View.java:21163)
                                                                                           at android.os.Handler.handleCallback(Handler.java:746)
                                                                                           at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                           at android.os.Looper.loop(Looper.java:148)
                                                                                           at android.app.ActivityThread.main(ActivityThread.java:5443)
                                                                                           at java.lang.reflect.Method.invoke(Native Method)
                                                                                              at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)

at.com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

03-25 22:25:26.248 32470-32470/com.example.fryselectronics.knowyourbooks I/Process：发送信号。 PID：32470 SIG：9 03-25 22:25:27.195 977-977/com.example.fryselectronics.knowyourbooks W/System: ClassLoader 引用未知路径: /data/app/com.example.fryselectronics.knowyourbooks-2/lib/arm 03-25 22:25:33.868 977-977/com.example.fryselectronics.knowyourbooks W/System: 类加载器引用未知路径: /data/app/com.example.fryselectronics.knowyourbooks-2/lib/arm 03-25 22:25:34.625 977-983/com.example.fryselectronics.knowyourbooks W/art：挂起所有线程耗时：13.958 毫秒 03-25 22:25:34.754 977-1423/com.example.fryselectronics.knowyourbooks D/OpenGLRenderer: 使用 EGL_SWAP_BEHAVIOR_PRESERVED: true 03-25 22:25:34.917 977-1423/com.example.fryselectronics.knowyourbooks I/Adreno-EGL: : QUALCOMM Build: 10/09/15, 6cbbf7d, I3193f6e94a 03-25 22:25:34.921 977-1423/com.example.fryselectronics.knowyourbooks I/OpenGLRenderer：初始化 EGL，版本 1.4 03-25 22:25:37.932 977-1423/com.example.fryselectronics.knowyourbooks E/Surface: getSlotFromBufferLocked: 未知缓冲区: 0xb8e4e140 03-25 22:25:37.933 977-1423/com.example.fryselectronics.knowyourbooks D/OpenGLRenderer：0xb8fab560 (RippleDrawable) 上的 endAllActiveAnimators，句柄为 0xb8e11eb0 03-25 22:25:39.101 977-1423/com.example.fryselectronics.knowyourbooks E/Surface：getSlotFromBufferLocked：未知缓冲区：0xb8fbb720 03-25 22:25:39.101 977-1423/com.example.fryselectronics.knowyourbooks D/OpenGLRenderer：endAllActiveAnimators on 0xb8ec5cf0 (RippleDrawable) with handle 0xb8e51df0 03-25 22:25:41.803 977-1423/com.example.fryselectronics.knowyourbooks E/Surface: getSlotFromBufferLocked: 未知缓冲区: 0xb8e613a8 03-25 22:25:44.821 977-977/com.example.fryselectronics.knowyourbooks D/AndroidRuntime: 关闭虚拟机

Answer 1

你好尝试改变这个：

<activity android:name=".Main2Activity" />

    <activity android:name=".Main6Activity"></activity>

通过 Refactoring Class 名称在你的清单中做到这一点：

<activity android:name=".MainActivity_Two" />

    <activity android:name=".MainActivity_Six"></activity>

命名可能有问题

或者尝试在您的 MainActivity.java class

中更改此设置

ab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Intent intent = new Intent(MainActivity.this, Main2Activity.class);
            startActivity(intent);

        }

    });
    ba=(Button)findViewById(R.id.button);



    ba.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

                   Intent intentt = new Intent(MainActivity.this, Main6Activity.class);
                    startActivity(intentt);


            }

    });

而不是：

ab=(Button)findViewById(R.id.button2);
    final Intent intent= new Intent();
    intent.setClass(MainActivity.this, Main2Activity.class);

    ab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


            startActivity(intent);

        }

    });
    ba=(Button)findViewById(R.id.button);
    final Intent intentt= new Intent();
    intentt.setClass(MainActivity.this, Main6Activity.class);

    ba.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


                    startActivity(intentt);


            }

    });

Answer 2

这是您要制作的作品的工作版本：

主要Activity

public class MainActivity extends AppCompatActivity {

private Button btn1;
private Button btn2;

private void startMyActivity(Intent intent) {
    startActivity(intent);
}

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

    btn1 = (Button) findViewById(R.id.button);
    btn2 = (Button) findViewById(R.id.button2);


    btn1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent myIntent = new Intent(MainActivity.this, Main2Activity.class);
            startMyActivity(myIntent);
        }
    });

    btn2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent myIntent = new Intent(MainActivity.this, Main3Activity.class);
            startActivity(myIntent);
        }
    });
}

}

和 xml:

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

<RelativeLayout
    android:id="@+id/activity_main"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.ngenh.stack.MainActivity">

<Button
    android:text="Button2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_toRightOf="@+id/button"
    android:layout_toEndOf="@+id/button"
    android:layout_marginLeft="67dp"
    android:layout_marginStart="67dp"
    android:id="@+id/button2"
    android:layout_alignTop="@+id/button"/>

<Button
    android:text="Button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="51dp"
    android:layout_marginStart="51dp"
    android:layout_marginTop="107dp"
    android:id="@+id/button"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"/>
</RelativeLayout>

另外两个活动是空的。

对您的代码的一些评论：

尽量不要像内置变量那样命名变量，因为您会隐藏它们。
如果您发现相同的代码重复出现，唯一不同的是一两个变量，请尝试为其创建一个函数。
提供具体的名称和 ID（与我所做的不同）。登录按钮应该是 btnLogin 或类似的东西，而不是 button1、button2 等。

Answer 3

根据您附加的错误日志，您的 AndroidManifest.xml 文件似乎没有问题。再次 clean 和 build 您的项目。

顺便说一句，我已经修改了你的一些代码部分并且它工作正常。你可以试试这个：

MainActivity.java

package com.example.fryselectronics.knowyourbooks;

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 buttonA;
    Button buttonB;

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

        buttonA = (Button) findViewById(R.id.button_a);
        buttonB = (Button) findViewById(R.id.button_b);

        buttonA.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(MainActivity.this, Main2Activity.class);
                startActivity(intent);
            }
        });
        buttonB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(MainActivity.this, Main6Activity.class);
                startActivity(intent);
            }
        });
    }
}

Main2Activity.java

package com.example.fryselectronics.knowyourbooks;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
    }
}

Main6Activity.java

package com.example.fryselectronics.knowyourbooks;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class Main6Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main6);
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:background="@drawable/a"
    tools:context="com.example.fryselectronics.knowyourbooks.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Click on any one of the data sets from below"
        android:id="@+id/textView"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <Button
        android:id="@+id/button_a"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:text="A"
        android:layout_marginBottom="40dp"
        style="?android:attr/buttonStyleSmall" />

    <Button
        android:id="@+id/button_b"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_below="@id/button_a"
        android:text="B"
        style="?android:attr/buttonStyleSmall" />

</RelativeLayout>

activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main2"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.fryselectronics.knowyourbooks.Main2Activity">

</RelativeLayout>

activity_main6.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main2"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.fryselectronics.knowyourbooks.Main6Activity">

</RelativeLayout>

AndroidManifest.xml

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        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=".Main2Activity" />
        <activity android:name=".Main6Activity" />
    </application>

</manifest>

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