Android：用片段視圖替換活動視圖

Question

我一直在尋找幾小時和幾個小時來理解片段和活動之間的關係，我仍然無法正確使用我的代碼。

我有一個加載actvity_main.xml的mainScreen類。這個主屏幕有一個圖形和邊欄等佈局

我有一個按鈕是在側欄上應該啓動一個側欄片段，其中有一個複選框列表視圖，因此我可以選擇要顯示的數據我的圖表等等。但是不管我做什麼，這個片段都不顯示。它顯示了「Bing〜！」敬酒，但沒有其他觀點發起。 也許我不應該使用一個片段？我不想開始一個新的活動，因爲複選框應該與圖形交互，並且其中有一個動態表格的片段，它會來回交互，等等。 我不太確定在這裏做什麼。我有大約3周的Android體驗，所以我還沒有完全瞭解它的整個版本。真的很感謝任何想法或幫助，我可以得到。我完全被難住了，因此不得不張貼我自己的問題。 我真的很感謝任何幫助！謝謝！

mainScreen.java

public class mainScreen extends Activity { 

private TextView text_display; 
private Button button_list; 
private Button button_table; 
private String[] dataHolder; 
public boolean listClicked = false; 


public void loadData() { 

    //loaddata stuff here 

} 

public void createGraph() { 

    //graph create stuff here 


} 

public void buttonClick() { 

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

        sideFragment sf = new sideFragment(); 
        FragmentManager fm = getFragmentManager(); 
        FragmentTransaction ft = fm.beginTransaction(); 
        ft.replace(R.id.side_fragment, sf); 
        ft.commit(); 

        Toast.makeText(mainScreen.this, "Bing~!", Toast.LENGTH_SHORT).show(); 
       } 
      } 
    ); 


} 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Intent i = getIntent(); 
    dataHolder = i.getStringArrayExtra("dataHolder"); 
    button_list = (Button)findViewById(R.id.button_list); 

    loadData(); 
    createGraph(); 
    buttonClick(); 

} 

} 

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=".mainScreen" 
android:id="@+id/mainlayout" 
android:orientation="horizontal" 
android:weightSum="1"> 

<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="85dp" 
    android:layout_height="match_parent"> 

    <Button 
     style="?android:attr/buttonStyleSmall" 
     android:layout_width="85dp" 
     android:layout_height="85dp" 
     android:text="Select" 
     android:id="@+id/button_list" /> 

    <Button 
     style="?android:attr/buttonStyleSmall" 
     android:layout_width="85dp" 
     android:layout_height="85dp" 
     android:text="Table" 
     android:id="@+id/button_table" /> 
</LinearLayout> 

<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="40dp" 
     android:text=" " 
     android:id="@+id/text_display" 
     android:textSize="26dp" 
     android:layout_margin="5dp" /> 

    <com.jjoe64.graphview.GraphView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/graph" /> 

</LinearLayout> 

<fragment 
    android:name="xabre.mobileicip.sideFragment" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:id="@+id/side_fragment" /> 

</LinearLayout> 

sideFragment.java

public class sideFragment extends Fragment implements android.widget.CompoundButton.OnCheckedChangeListener { 

ListView listviewFrag; 
ArrayList<sideFrag> sideFragList; 
sideFragAdapter sfAdapter; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.side_fragment, container, false); 

    listviewFrag = (ListView) view.findViewById(R.id.side_listview); 
    //displayList(); 

    return view; 

} 

private void displayList() { 

    sideFragList = new ArrayList<sideFrag>(); 
    sideFragList.add(new sideFrag("SPO2")); 
    sideFragList.add(new sideFrag("O2 Flow Rate")); 
    sideFragList.add(new sideFrag("Resp.")); 
    sideFragList.add(new sideFrag("Cardiac Output")); 
    sideFragList.add(new sideFrag("Cardiac Index")); 
    sideFragList.add(new sideFrag("SVR")); 
    sideFragList.add(new sideFrag("Wedge Pressure")); 

    listviewFrag.setAdapter(sfAdapter); 

} 

@Override 
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 

    int pos = listviewFrag.getPositionForView(buttonView); 
    if (pos != ListView.INVALID_POSITION) { 
     sideFrag sf = sideFragList.get(pos); 
     sf.setSelected(isChecked); 

     Toast.makeText(getActivity(),"" + sf.getName(), Toast.LENGTH_SHORT).show(); 
     //Toast.makeText(sideFragment.this, "Clicked on sideFrag: " + sf.getName() + ". State: is " + isChecked, Toast.LENGTH_SHORT).show(); 
    } 
} 
} 

side_fragment.xml

<LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:orientation="vertical" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
tools:context=".sideFragment" 
android:id="@id/side_fragment"> 

<TextView 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:text="HELLO WORLD" 
    android:id="@+id/helloTester"/> 

<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_margin="20dp"> 

    <ListView 
     android:id="@+id/side_listview" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 
    </ListView> 

</LinearLayout> 

</LinearLayout> 

side_list.xml

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

<CheckBox android:id="@+id/check_box" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:onClick="onCheckboxClicked" 
    android:layout_marginBottom="15dp" /> 

<TextView 
    android:id="@+id/check_name" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_toRightOf="@+id/check_box" 
    android:textStyle="bold"/> 


</RelativeLayout> 

sideFragAdapter.java

package xabre.mobileicip; 

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.CheckBox; 
import android.widget.CompoundButton; 
import android.widget.TextView; 

import java.util.List; 

class sideFrag { 
    String name; 
    boolean selected = false; 
    public sideFrag(String name) { 
     super(); 
     this.name = name; 
    } 

    public boolean isSelected() { 
     return selected; 
    } 

    public void setSelected(boolean selected) { 
     this.selected = selected; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

} 
public class sideFragAdapter extends ArrayAdapter<sideFrag> implements CompoundButton.OnCheckedChangeListener { 

    private List<sideFrag> sideList; 
    private Context context; 

    public sideFragAdapter (List<sideFrag> sideList, Context context) { 
     super(context, R.layout.side_list, sideList); 
     this.sideList = sideList; 
     this.context = context; 
    } 

    private static class sideHolder { 
     public CheckBox check_box; 
     public TextView check_name; 
     /* public CheckBox check_O2FR; 
     public CheckBox check_Resp; 
     public CheckBox check_Carout; 
     public CheckBox check_Carind; 
     public CheckBox check_svr; 
     public CheckBox check_resprate; 
     public CheckBox check_Peep; 
     public CheckBox check_O2AF; 
     public CheckBox check_FIO2; 
     public CheckBox check_PO2; 
     public CheckBox check_HCO3; 
     public CheckBox check_Urea; 
     public CheckBox check_Potassium; 
     public CheckBox check_Sodium; 
     public CheckBox check_Creatinine; 
     public CheckBox check_FluidIn; 
     public CheckBox check_FluidOut; 
     */ 
    } 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

    View v = convertView; 

    sideHolder holder = new sideHolder(); 

    if(convertView == null) { 

     LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     v = inflater.inflate(R.layout.side_list, parent, false); 

     holder.check_box = (CheckBox) v.findViewById(R.id.checkbox); 
     holder.check_name = (TextView) v.findViewById(R.id.check_name); 


     holder.check_box.setOnCheckedChangeListener(this); 

    } else { 
     holder = (sideHolder) v.getTag(); 
    } 

    sideFrag p = sideList.get(position); 
    holder.check_name.setText(p.getName()); 
    holder.check_box.setChecked(p.isSelected()); 
    holder.check_box.setTag(p); 

    return v; 
} 

@Override 
public void onCheckedChanged(CompoundButton buttonView, 
          boolean isChecked) { 

} 
} 

Answer 1

你只能更換由代碼添加的元素。 side_fragment以XML形式添加，因此是「只讀」結構的一部分。您需要從XML中刪除<fragment>元素，並且如果您想稍後替換它，請從代碼中添加該元素。