我一直在寻找试图理解片段和活动之间关系的时间，但是我仍然无法用我的代码正确地理解它。
我有一个mainScreen类，它加载actvity_main.xml。该主屏幕的布局包含图形和侧边栏等。
我在侧栏上有一个按钮，该按钮应该启动侧栏片段，其中有一个复选框列表视图，因此我可以选择要在图形上显示的数据等。但是无论我做什么，该片段都不会显示。它显示“ Bing〜！”吐司，但没有其他视图被启动。
也许我不应该使用片段？我不想启动一个新活动，因为该复选框应该与图以及其中包含动态表的另一个片段进行交互，并且它将来回交互等等。
我不太确定该怎么做。我大约有3个星期的Android经验，所以我还不完全了解它的全部功能。非常感谢任何想法或我能得到的帮助。我完全被困住了，因此不得不发表自己的问题。
我真的很感谢任何帮助！谢谢！
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
<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) {
}
}
最佳答案
您只能替换从代码添加的元素。 side_fragment是在XML中添加的，因此是“只读”结构的一部分。您需要从XML中删除<fragment>元素，并在以后从代码中添加它。