java - 当我按回我的程序时，我看到一个空白屏幕

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进入chapter3_1.xml页面后，当我按下手机后退键时，该页面会正常弹出，并将我带到上一个按钮。再按一次，就会出现一个不应该出现的空白页。再次按返回，您将到达原来的按钮。没有错误，没有崩溃。

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 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.th3ramr0d.ar670_1quickreference"
 android:versionCode="1"
 android:versionName="1.0" >

 <uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="21" />

 <application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainMenu"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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


    <activity
        android:name=".SubMenu1"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="com.th3ramr0d.ar670_1quickreference.SUBMENU1" />

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

    <activity
        android:name=".Chapter3"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="com.th3ramr0d.ar670_1quickreference.CHAPTER3" />

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

    <activity
        android:name=".Chapter3_1"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="com.th3ramr0d.ar670_1quickreference.CHAPTER3_1" />

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

 </application>

 </manifest>

MainMenu.java

 package com.th3ramr0d.ar670_1quickreference;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;

 public class MainMenu extends Activity{

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button btnChpt3 = (Button) findViewById(R.id.btnChpt3);
    btnChpt3.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            startActivity(new Intent("com.th3ramr0d.ar670_1quickreference.CHAPTER3"));
        }
    });
 }
 }

SubMenu1.java

 package com.th3ramr0d.ar670_1quickreference;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;

 public class SubMenu1 extends Activity{

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.chapter3);

    Button btnChpt3 = (Button) findViewById(R.id.btnChpt3_1);
    btnChpt3.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            startActivity(new Intent("com.th3ramr0d.ar670_1quickreference.CHAPTER3_1"));
        }
    });
 }

 }

Chapter3.java

 package com.th3ramr0d.ar670_1quickreference;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;

 public class Chapter3 extends Activity{

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    startActivity(new Intent("com.th3ramr0d.ar670_1quickreference.SUBMENU1"));
 }

 }

Chapter3_1.java

 package com.th3ramr0d.ar670_1quickreference;

 import android.app.Activity;
 import android.os.Bundle;

 public class Chapter3_1 extends Activity{

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.chapter3_1);
 }
 }

activity_main.xml

 <LinearLayout 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.th3ramr0d.ar670_1quickreference.MainActivity" >

 <Button
    android:id="@+id/btnChpt3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Chapter 3" />

 </LinearLayout>

chapter3.xml

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

 <Button
    android:id="@+id/btnChpt3_1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="fuckmylife" />

 </LinearLayout>

chapter3_1.xml

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

 <TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="This is the content of chapter 3_1"
    android:textAppearance="?android:attr/textAppearanceLarge" />

 </LinearLayout>

Answer 1

我认为您在应用程序中使用了 fragment 。当您推送 fragment 时，您会将其添加到后退堆栈中，这就是为什么当您按后退按钮时，它将显示一个空白屏幕，这是您在其上显示 fragment View 的框架布局。请参阅link :-

Fragmnet manager