如何在纵向和横向上更改用户界面

我知道这里有关于使用方向和横向布局的问题，但是我想要做的有点不同。我的目标是在旋转到横向时完全更改UI，例如，纵向显示常规信息但旋转时显示表格。如何在纵向和横向上更改用户界面

这是否涉及有两个单独的活动和使用if语句根据方向启动活动？我尝试过使用简单的横向布局，但是当我改变方向时，它会在纵向布局中使用的所有项目的findviewbyids的nullpointerexception上关闭。在其条款内容为manusunny

public class PortraitFragment extends FragmentActivity { 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

      View view = inflater.inflate(R.layout.content_main, container, false); 
      ImageView imageView = (ImageView) view.findViewById(R.id.imageView); 
      TextView lessonString = (TextView) view.findViewById(R.id.primaryText); 
      TextView subTextString = (TextView) view.findViewById(R.id.secondaryText); 
      return view; 
     } 
    } 


public class LandscapeFragment extends FragmentActivity { 

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

     View view = inflater.inflate(R.layout.content_portrait, container, false); 
     ImageView imageView = (ImageView) view.findViewById(R.id.imageView); 
     TextView lessonString = (TextView) view.findViewById(R.id.primaryText); 
     TextView subTextString = (TextView) view.findViewById(R.id.secondaryText); 
     return view; 

    } 
}

MainActivty

添加的代码

package com.example.harris.doitrightyoustupidcretin; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 

import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
import android.view.View; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.ImageView; 
import android.widget.TextView; 
import android.support.v4.app.FragmentActivity; 
import com.example.harris.doitrightyoustupidcretin.R; 

import org.joda.time.LocalTime; 

import java.util.Calendar; 

public class MainActivity extends AppCompatActivity { 

    private static final String TAG = "MyLog"; 


    String historyInfo[] = new String[2]; 
    String computingInfo[] = new String[2]; 
    String reInfo[] = new String[2]; 
    String biologyInfo[] = new String[2]; 
    String physicsInfo[] = new String[2]; 
    String chemistryInfo[] = new String[2]; 
    String frenchInfo[] = new String[2]; 
    String englishInfo[] = new String[2]; 
    String mathsInfo[] = new String[2]; 
    String gamesInfo[] = new String[2]; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 


     historyInfo[0] = "H1"; 
     historyInfo[1] = "Miss Bradbury"; 

     mathsInfo[0] = "MA1"; 
     mathsInfo[1] = "Miss Lawrence"; 

     biologyInfo[0] = "BL1"; 
     biologyInfo[1] = "Mr Gibson"; 

     chemistryInfo[0] = "CL2"; 
     chemistryInfo[1] = "Dr Bowers"; 

     frenchInfo[0] = "LA8"; 
     frenchInfo[1] = "Miss Bailey"; 

     reInfo[0] = "RE2"; 
     reInfo[1] = "Mr Dimmock"; 

     englishInfo[0] = "ER1"; 
     englishInfo[1] = "Miss Richards"; 

     gamesInfo[0] = "Sports Hall"; 
     gamesInfo[1] = "Mr Pugh"; 

     computingInfo[0] = "IT1"; 
     computingInfo[1] = "Mr Green"; 

     physicsInfo[0] = "PL2"; 
     physicsInfo[1] = "Mr Evans"; 


     String nextLessonString = "default"; 



     nextlesson(); 

     setLessonText(); 



     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       nextlesson(); 
      } 
     }); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 
    public void setLessonText(){ 
     ImageView imageView = (ImageView) findViewById(R.id.imageView); 
     TextView lessonString = (TextView) findViewById(R.id.primaryText); 
     TextView subTextString = (TextView) findViewById(R.id.secondaryText); 

     lessonString.setText(nextlesson()); 

     if (nextlesson()== "History"){ 
      imageView.setImageResource(R.drawable.history); 
      subTextString.setText(historyInfo[1] + " - "+historyInfo[0]); 
     } 
     if (nextlesson()== "Maths"){ 
      imageView.setImageResource(R.drawable.maths); 
      subTextString.setText(mathsInfo[1] + " - " + mathsInfo[0]); 
     } 
     if (nextlesson()== "English"){ 
      imageView.setImageResource(R.drawable.english); 
      subTextString.setText(englishInfo[1] + " - " + englishInfo[0]); 
     } 
     if (nextlesson()== "French"){ 
      imageView.setImageResource(R.drawable.french); 
      subTextString.setText(frenchInfo[1] + " - " + frenchInfo[0]); 
     } 
     if (nextlesson()== "Computing"){ 
      imageView.setImageResource(R.drawable.computing); 
      subTextString.setText(computingInfo[1] + " - " + computingInfo[0]); 
     } 
     if (nextlesson()== "Biology"){ 
      imageView.setImageResource(R.drawable.biology); 
      subTextString.setText(biologyInfo[1] + " - " + biologyInfo[0]); 
     } 
     if (nextlesson()== "Chemistry"){ 
      imageView.setImageResource(R.drawable.chemistry); 
      subTextString.setText(chemistryInfo[1] + " - " + chemistryInfo[0]); 
     } 
     if (nextlesson()== "Physics"){ 
      imageView.setImageResource(R.drawable.physics); 
      subTextString.setText(physicsInfo[1] + " - " + physicsInfo[0]); 
     } 
     if (nextlesson()== "RE"){ 
      imageView.setImageResource(R.drawable.re); 
      subTextString.setText(reInfo[1] + " - " + reInfo[0]); 
     } 
    } 


    public String nextlesson() { 
     Calendar c = Calendar.getInstance(); 
     int weekOfMonth = c.get(Calendar.WEEK_OF_MONTH); 
     LocalTime currentTime = LocalTime.now(); 
     int nextLessonNumber = 0; 
     String nextLessonString; 
     int currentLesson = 0; 

     LocalTime lesson1Start = new LocalTime("09:15"); 
     LocalTime lesson1End = new LocalTime("10:15"); 
     LocalTime lesson2Start = new LocalTime("10:15"); 
     LocalTime lesson3Start = new LocalTime("11:40"); 
     LocalTime lesson4start = new LocalTime("13:45"); 
     LocalTime lesson5Start = new LocalTime("14:45"); 
     LocalTime endOfDay = new LocalTime ("15:50"); 

     int dayOfWeek = c.get(Calendar.DAY_OF_WEEK); 
     int dateDays = c.get(Calendar.DAY_OF_MONTH); 
     int dateMonth = c.get(Calendar.MONTH); 

     if (currentTime.isBefore(lesson1Start)) { 
      //p1 next 
      nextLessonNumber = 1; 
      Log.d(TAG, "It worked"); 
      currentLesson = 0; 
     } else if (currentTime.isAfter(lesson1Start) && currentTime.isBefore(lesson1End)) { 
      //p2 next 
      nextLessonNumber = 2; 
      Log.d(TAG, "It worked"); 
      currentLesson = 1; 
     } else if (currentTime.isAfter(lesson2Start) && currentTime.isBefore(lesson3Start)) { 
      //p3 next 
      nextLessonNumber = 3; 
      Log.d(TAG, "It worked"); 
      currentLesson = 2; 
     } else if (currentTime.isAfter(lesson3Start) && currentTime.isBefore(lesson4start)) { 
      //p4 next 
      nextLessonNumber = 4; 
      Log.d(TAG, "It worked"); 
      currentLesson = 3; 
     } else if (currentTime.isAfter(lesson4start) && currentTime.isBefore(lesson5Start)) { 
      //p5 next 
      nextLessonNumber = 5; 
      Log.d(TAG, "It worked"); 
      currentLesson = 4; 
     } else if (currentTime.isAfter(lesson5Start) && currentTime.isAfter(endOfDay)) { 
      currentLesson = 5; 
     } else { 
      nextLessonNumber = 0; 
      Log.d(TAG, "It didn't worked"); 
     } 





     if ((weekOfMonth == 1) || (weekOfMonth == 3)) { 
      Log.d(TAG, "It made it this far"); 

      switch (dayOfWeek) { 
       case 1: //Sunday DO NOTHING 

        return "Sunday"; 
       case 2: //Monday WEEK B 
        if (nextLessonNumber == 1) { 
         return "Maths"; 

        } else if (nextLessonNumber == 2) { 
         return "Physics"; 
        } else if (nextLessonNumber == 3) { 
         return "History"; 
        } else if (nextLessonNumber == 4) { 
         return "Chemistry"; 
        } else if (nextLessonNumber == 5) { 
         return "French"; 
        }else { 

        } 
        break; 

       case 3: //Tuesday WEEK B 
        Log.d(TAG, "Yo it worked yo"); 
        if (nextLessonNumber == 1) { 
         return "RE"; 

        } else if (nextLessonNumber == 2) { 
         return "English"; 
        } else if (nextLessonNumber == 3) { 
         return "Maths"; 
        } else if (nextLessonNumber == 4) { 
         return "Computing"; 
        } else if (nextLessonNumber == 5) { 
         return "Biology"; 
        } else { 

        } 
        break; 

       case 4: //Wednesday WEEK B 
        if (currentLesson == 1) { 
         return "English"; 

        } else if (nextLessonNumber == 2) { 
         return "Computing"; 
        } else if (nextLessonNumber == 3) { 
         return "Chemistry"; 
        } else if (nextLessonNumber == 4) { 
         return "French"; 
        } else if (nextLessonNumber == 5) { 
         return "History"; 
        }else { 

        } 
        break; 

       case 5: //Thursday WEEK B 
        Log.d(TAG, "ThursWeekB"); 
        if (nextLessonNumber == 1) { 
         return "French"; 

        } else if (nextLessonNumber == 2) { 
         return "History"; 
        } else if (nextLessonNumber == 3) { 
         return "Physics"; 
        } else if (nextLessonNumber == 4) { 
         return "Games"; 
        } else if (nextLessonNumber == 5) { 
         return "Games"; 
        }else { 

        } 
        break; 

       case 6: //Friday WEEK B 
        if (nextLessonNumber == 1) { 
         return "RE"; 

        } else if (nextLessonNumber == 2) { 
         return "Biology"; 
        } else if (nextLessonNumber == 3) { 
         return "Computing"; 
        } else if (nextLessonNumber == 4) { 
         return "English"; 
        } else if (nextLessonNumber == 5) { 
         return "Maths"; 
        }else { 

        } 
        break; 
       case 7: //Saturday DO NOTHING 
         return "Saturday"; 

      } 

     } else { 

      switch (dayOfWeek) { 
       case 1: //Sunday DO NOTHING 

        return "Sunday"; 
       case 2: //Monday WEEK A 
        if (nextLessonNumber == 1) { 
         return "Maths"; 

        } else if (nextLessonNumber == 2) { 
         return "English"; 

        } else if (nextLessonNumber == 3) { 
         return "Computing"; 

        } else if (nextLessonNumber == 4) { 
         return "RE"; 
        } else if (nextLessonNumber == 5) { 
         return "Physics"; 
        }else { 

        } 
        break; 

       case 3: //Tuesday WEEK A 
        Log.d(TAG, "It worked yo pNOTHING"); 
        if (nextLessonNumber == 1) { 
         return "Maths"; 

        } else if (nextLessonNumber == 2) { 
         return "French"; 
        } else if (nextLessonNumber == 3) { 
         return "History"; 
        } else if (nextLessonNumber == 4) { 
         return "English"; 
        } else if (nextLessonNumber == 5) { 
         return "Chemistry"; 
        }else { 

        } 
        break; 

       case 4: //Wednesday WEEK A 
        if (nextLessonNumber == 1) { 
         return "English"; 
        } else if (nextLessonNumber == 2) { 
         return "Computing"; 
        } else if (nextLessonNumber == 3) { 
         return "Biology"; 
        } else if (nextLessonNumber == 4) { 
         return "History"; 
        } else if (nextLessonNumber == 5) { 
         return "French"; 
        }else { 

        } 
        break; 

       case 5: //Thursday WEEK A 
        Log.d(TAG, "It worked yo thurs"); 
        if (nextLessonNumber == 1) { 
         return "Chemistry"; 

        } else if (nextLessonNumber == 2) { 
         return "French"; 
        } else if (nextLessonNumber == 3) { 
         return "Maths"; 
        } else if (nextLessonNumber == 4) { 
         return "Games"; 
        } else if (nextLessonNumber == 5) { 
         return "Games"; 
        }else { 

        } 
        break; 


       case 6: //Friday WEEK A 
        if (nextLessonNumber == 1) { 
         return "History"; 

        } else if (nextLessonNumber == 2) { 
         return "Physics"; 
        } else if (nextLessonNumber == 3) { 
         return "Computing"; 
        } else if (nextLessonNumber == 4) { 
         return "Maths"; 
        } else if (nextLessonNumber == 5) { 
         return "Biology"; 
        }else { 

        } 
        break; 
       case 7: //Saturday DO NOTHING 
        return "Saturday"; 

      } 
     } 

return null; 
    } 
}

来源

2015-11-28 Harris Douglas

使用一个单一的活动，两个片段。看下面这个例子，

MainActivity.java

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

    } 
}

RES /布局/ activity_main.xml中

<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" 
    tools:context="com.manusunny.myapplication.MainActivity" 
    android:orientation="vertical"> 

    <fragment android:name="com.manusunny.myapplication.PortraitFragment" 
     android:id="@+id/portrait_fragment" 
     android:layout_width="match_parent" 
     android:layout_height="30dp" /> 
</LinearLayout>

RES /布局，土地/ 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" 
    tools:context="com.manusunny.myapplication.MainActivity" 
    android:orientation="vertical"> 

    <fragment android:name="com.manusunny.myapplication.LandscapeFragment" 
     android:id="@+id/landscape_fragment" 
     android:layout_width="match_parent" 
     android:layout_height="30dp" /> 
</LinearLayout>

PortraitFragment.java

public class PortraitFragment extends Fragment { 
    public PortraitFragment() { 
     // Required empty public constructor 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
     View view = inflater.inflate(R.layout.fragment_portrait, container, false); 
     // do something 
     return view 
    } 
}

RES /布局/ fragment_portrait.xml

<FrameLayout 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" 
    tools:context="com.manusunny.myapplication.PortraitFragment"> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:text="Portrait" /> 
</FrameLayout>

LandscapeFragment.java

public class LandscapeFragment extends Fragment { 
    public LandscapeFragment() { 
     // Required empty public constructor 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
     View view = inflater.inflate(R.layout.fragment_landscape, container, false); 
     // do something 
     return view 
    } 
}

RES /布局/ fragment_landscape.xml

<FrameLayout 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" 
    tools:context="com.manusunny.myapplication.LandscapeFragment"> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:text="Landscape" /> 
</FrameLayout>

这将显示在竖屏'肖像'和'景观' 景观屏幕。

希望它有帮助。

来源

2015-11-28 20:45:03 Msp

我不确定我完全理解。我是否在这两个XML文件中包含一个片段？什么进入片段标签？ –

请阅读修改后的答案。并阅读[this]（http://developer.android.com/intl/es/training/basics/fragments/creating.html#AddInLayout）.. – Msp

感谢您的快速回复。我得到的错误 - 错误膨胀类fragement。我的两个片段看起来像这 - <片段的android：layout_width = “match_parent” 机器人：layout_height = “match_parent” 机器人：ID = “@ + ID/frag2” 机器人：名字=“android.support。 v7.app.AppCompatDialogFragment“ /> –

如何在纵向和横向上更改用户界面

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