Question

我正在使用列表视图，它使用自定义布局，布局包含两个textview和两个按钮。这是代码。。

<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="wrap_content"
    android:background="@drawable/border_week_flash_card" >

    <TextView
        android:id="@+id/txt_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_margin="12dp"
        android:textSize="20sp" />

    <Button
        android:id="@+id/bPractice_deck"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_below="@id/txt_title"
        android:layout_centerHorizontal="true"
        android:background="@drawable/week_button"
        android:onClick="startSwipeViewActiviy"
        android:text="Practice this deck ->" />

    <TextView
        android:id="@+id/txt_progress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/bPractice_deck"
        android:layout_margin="12dp"
        android:text="See Your progress by test . . ."
        android:textSize="20sp" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_below="@id/txt_progress"
        android:background="@drawable/week_button"
        android:text="Take test to see progress->" />

</RelativeLayout>

和我的主要java代码是。。。

    public class Course_Week extends ListActivity {
    Button bPractice;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        final Context context = this;
        // bPractice=(Button)findViewById(R.id.bPractice_deck);
        final String[] course = { "Week 1", "Week 2", "Week 3", "Week 4", "Week 5",
                "Week 6", "Week 7", "Week 8", "Week 9", "Week 10", "Week 11",
                "Week 12" };
        ArrayAdapter<String> adopter = new ArrayAdapter<String>(this,
                R.layout.week_flash_card, R.id.txt_title, course) {
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                super.getView(position, convertView, parent);
                LayoutInflater inflater = (LayoutInflater) context
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                    View rowView = inflater.inflate(R.layout.week_flash_card, parent, false);
                    TextView textView = (TextView) rowView.findViewById(R.id.txt_title);
                    //ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
                    textView.setText(course[position]);
                    // Change the icon for Windows and iPhone
                    switch(postion){
                        case 0:
                            //when button on first week click
                            break;
                        case 1:
                            //when button on 2nd week click
                            break;
                        }

                    return rowView;

            }
        };
        setListAdapter(adopter);

    }
}

问题是我不知道如何实现onclick操作，因为我想在点击每个不同的列表按钮时执行不同的操作。即我想点击第1周的“练习这个牌”按钮时执行不同的操作，而按第2周“练习这个牌组按钮”则不同。。

06-28 22:21:49.003: E/AndroidRuntime(14739): FATAL EXCEPTION: main
06-28 22:21:49.003: E/AndroidRuntime(14739): Process: com.saru.chaudhary.wpmeasy, PID: 14739
06-28 22:21:49.003: E/AndroidRuntime(14739): java.lang.NullPointerException
06-28 22:21:49.003: E/AndroidRuntime(14739):    at com.saru.chaudhary.wpmeasy.Course_Week$1.getView(Course_Week.java:37)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.widget.AbsListView.obtainView(AbsListView.java:2255)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.widget.ListView.makeAndAddView(ListView.java:1790)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.widget.ListView.fillDown(ListView.java:691)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.widget.ListView.fillFromTop(ListView.java:752)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.widget.ListView.layoutChildren(ListView.java:1630)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.widget.AbsListView.onLayout(AbsListView.java:2087)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.View.layout(View.java:14860)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.ViewGroup.layout(ViewGroup.java:4643)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.View.layout(View.java:14860)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.ViewGroup.layout(ViewGroup.java:4643)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:374)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.View.layout(View.java:14860)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.ViewGroup.layout(ViewGroup.java:4643)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.View.layout(View.java:14860)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.ViewGroup.layout(ViewGroup.java:4643)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2013)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1770)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1019)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5725)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.Choreographer.doCallbacks(Choreographer.java:574)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.Choreographer.doFrame(Choreographer.java:544)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.os.Handler.handleCallback(Handler.java:733)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.os.Handler.dispatchMessage(Handler.java:95)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.os.Looper.loop(Looper.java:136)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at android.app.ActivityThread.main(ActivityThread.java:5086)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at java.lang.reflect.Method.invokeNative(Native Method)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at java.lang.reflect.Method.invoke(Method.java:515)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
06-28 22:21:49.003: E/AndroidRuntime(14739):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

试试这个。未经测试，但应该有效：

final Context context = this;
ArrayAdapter<String> adopter = new ArrayAdapter<String>(this,
            R.layout.week_flash_card, R.id.txt_title, course)
{
    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        super.getView(position, convertView, parent);
        //convertView = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE).inflate(R.layout.week_flash_card, null);
        Button button = convertView.findViewById(R.id.bPractice_deck);
        button.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View arg0)
            {
                switch(position)
                {
                    case 0:
                    {
                        // your code goes here
                        break;
                    }
                    case 1:
                    {
                        // your code goes here
                        break;
                    }
                    // etc...
                }

            }
        });
        return convertView;
    }
};
setListAdapter(adopter);

Answer 2

// bPractice=(Button)findViewById(R.id.bPractice_deck);会导致错误（如果当然没有注释），因为您还没有为您的活动设置布局。

- 要解决：

在getView（）

TextView textView = (TextView) rowView.findViewById(R.id.txt_title);

将其更改为bPractice=(Button) rowView.findViewById(R.id.bPractice_deck);

然后在下一行中，执行bPractice.setTag(Integer.valueOf(position))。此标记可让您利用点击方法中的位置。由于您使用android:onClick="startSwipeViewActiviy"在xml中声明了click方法，因此您现在需要创建方法（而不是以编程方式设置侦听器并使用onClick）

public void startSwipeViewActivity(View v){
    switch((Integer) v.getTag()){
         case 0:
             // Do stuff for case 0
             break;
         case 1:
             // Do stuff for case 1
             break;
         // Continue for all other cases
     }
}

我无法对此进行测试，但至少应该让你朝着正确的方向前进。如果它不起作用，让我知道为什么，当我有机会测试它时，我可以找出我出错的地方。

如何使用自定义布局作为采用者的列表视图中的按钮单击执行不同的操作？

2 个答案: