编辑扩展列表中的文本

时间:2013-09-10 18:08:39

标签: android android-listview android-edittext

我对这个问题有点挣扎。所以我有可扩展的列表,我想制作用于输入数据的编辑文本。我创建了一个按钮,因此我可以在按钮激活(On Click)上使用输入的数据。我还创建了一个编辑文本视图。但是当我想要接收这些数据时,没有任何反应,我使用edittex.getText().toString()。我使用Log.i进行测试,但logger甚至没有出现在logcat上。

ExpandableListAdapter

package lt.whiteGroup.ultimateshoppinglist;

import java.util.logging.Logger;

import android.app.Activity;
import android.util.Log;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.webkit.WebView.FindListener;
import android.widget.BaseExpandableListAdapter;
import android.widget.Button;
import android.widget.CheckedTextView;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MyExpandableListAdapter extends BaseExpandableListAdapter {

    private final SparseArray<Group> groups;
    public LayoutInflater inflater;
    public Activity activity;
    private Button but;
    private EditText edittex;


    public MyExpandableListAdapter(Activity act, SparseArray<Group> groups) {
        activity = act;
        this.groups = groups;
        inflater = act.getLayoutInflater();
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return groups.get(groupPosition).children.get(childPosition);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return 0;
    }

    @Override
    public View getChildView(int groupPosition, final int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        final String children = (String) getChild(groupPosition, childPosition);

        TextView text = null;
        if (convertView == null) {
            convertView = inflater.inflate(R.layout.listrow_details, null);
        }
        text = (TextView) convertView.findViewById(R.id.textView1);
        text.setText(children);
//      convertView.setOnClickListener(new OnClickListener() {
//          @Override
//          public void onClick(View v) {
//              Toast.makeText(activity, children,
//                      Toast.LENGTH_SHORT).show();
//          }
//      });
        but = (Button) convertView.findViewById(R.id.Button);
        edittex = (EditText) convertView.findViewById(R.id.ET);

        but.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                 EditText et = ((ViewGroup)v.getParent()).getChildAt(0);
                 System.out.println(et.getText().toString());
    //          Log.i("dsds", c);

            }
        });
        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return groups.get(groupPosition).children.size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return groups.get(groupPosition);
    }

    @Override
    public int getGroupCount() {
        return groups.size();
    }

    @Override
    public void onGroupCollapsed(int groupPosition) {
        super.onGroupCollapsed(groupPosition);
    }

    @Override
    public void onGroupExpanded(int groupPosition) {
        super.onGroupExpanded(groupPosition);
    }

    @Override
    public long getGroupId(int groupPosition) {
        return 0;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = inflater.inflate(R.layout.listrow_group, null);
        }
        Group group = (Group) getGroup(groupPosition);
        ((CheckedTextView) convertView).setText(group.string);
        ((CheckedTextView) convertView).setChecked(isExpanded);
        return convertView;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return false;
    }

}

LOG

09-10 21:54:37.851: E/AndroidRuntime(1025): FATAL EXCEPTION: main
09-10 21:54:37.851: E/AndroidRuntime(1025): java.lang.ClassCastException: android.widget.TextView
09-10 21:54:37.851: E/AndroidRuntime(1025):     at lt.whiteGroup.ultimateshoppinglist.MyExpandableListAdapter$1.onClick(MyExpandableListAdapter.java:70)
09-10 21:54:37.851: E/AndroidRuntime(1025):     at android.view.View.performClick(View.java:2485)
09-10 21:54:37.851: E/AndroidRuntime(1025):     at android.view.View$PerformClick.run(View.java:9080)
09-10 21:54:37.851: E/AndroidRuntime(1025):     at android.os.Handler.handleCallback(Handler.java:587)
09-10 21:54:37.851: E/AndroidRuntime(1025):     at android.os.Handler.dispatchMessage(Handler.java:92)
09-10 21:54:37.851: E/AndroidRuntime(1025):     at android.os.Looper.loop(Looper.java:130)
09-10 21:54:37.851: E/AndroidRuntime(1025):     at android.app.ActivityThread.main(ActivityThread.java:3687)
09-10 21:54:37.851: E/AndroidRuntime(1025):     at java.lang.reflect.Method.invokeNative(Native Method)
09-10 21:54:37.851: E/AndroidRuntime(1025):     at java.lang.reflect.Method.invoke(Method.java:507)
09-10 21:54:37.851: E/AndroidRuntime(1025):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
09-10 21:54:37.851: E/AndroidRuntime(1025):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
09-10 21:54:37.851: E/AndroidRuntime(1025):     at dalvik.system.NativeStart.main(Native Method)

ListRowDetails布局

<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="40dp"
    android:clickable="true"
    android:orientation="vertical"
    android:paddingLeft="40dp"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:drawableLeft="@drawable/ic_launcher"
        android:drawablePadding="5dp"
        android:gravity="center_vertical"
        android:text="@string/hello_world"
        android:textSize="14sp"
        android:textStyle="bold" 

        >
    </TextView>

    <View
        android:layout_below="@id/textView1"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@android:color/black" />
    <Button 
       android:id="@+id/Button"
       android:layout_marginTop="1dp"
       android:layout_below="@id/textView1"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content" 
       android:text="Add to list"
       android:onClick="ButtonFunction" 
        />
    <EditText 
       android:id="@+id/ET" 
       android:layout_alignParentRight="true"
       android:layout_toRightOf="@id/textView1"
       android:inputType="text"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content" 
       android:hint="Quantity"
        />

</RelativeLayout>

1 个答案:

答案 0 :(得分:1)

您无法获取任意创建/添加的视图的值。在onClick事件中,edittex指的是类范围EditText edittex变量(从未初始化/使用BTW)。由于onClick侦听器将在未确定的时间被调用,因此这不是您应该引用EditText字段的方式。假设您有以下布局:

<LinearLayout>
    <EditText />
    <Button />
</LinearLayout>

你应该做一些不依赖于在onClickListener之外初始化的变量的东西,比如:

    // Make sure to that you are referencing the button variable and not the Button class here
    yourButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            EditText et = (EditText) ((ViewGroup)v.getParent()).getChildAt(0);
            System.out.println(et.getText().toString());
            // You can use the logger if you want, but I always find it easier to use System.out if I'm just printing out one value.
        }
    });

<强> Explination:

通常,当使用ExpandableListView,ListView或任何其他允许向其添加任意数量视图的视图时,我发现最简单的方法是转到所单击视图的父级以查找任何同级视图。您不能引用已在其他方法中声明的局部变量。因此,这一行:String c = edittex.getText().toString();实际上是指具有类范围的EditText edittex变量(您在类顶部声明的那个)。该变量是:a)从未初始化,或b)该值被后续方法调用覆盖。因此,当您引用它时,您不会引用您认为自己的变量。

为了解决这个问题,您需要做的就是使用作为参数传递的View来获取包含它的父级(如果您的布局与我的布局相似,则它是ViewGroup的子类)向你展示了一个例子)。完成后,您可以通过getChildAt()方法访问父级的任何子视图。在这种情况下,我假设EditText视图是父视图的第一个子视图(第0个索引处的视图)。根据需要调整索引。

另外,这一行:Button.setOnClickListener(new OnClickListener() {应该是Button变量的名称,而不是Button类。