Question

我的mylist.xml中有两个按钮，使用arrayadapter将其插入main.xml的listview中。它向我显示了应用程序中的数据，但仅单击功能不起作用无法单击列表和两个按钮。

activity_main.xml

（在这个文件中，我刚刚使用xml创建了listview，将在其中插入我的自定义列表“ mylist.xml”。）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/lv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    </ListView>

</LinearLayout>

mylist.xml

（在此文件中，mainactivity上存在的listview lv的所有内容。这些文件需要插入该listview中。）

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

    <TextView
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:layout_marginTop="10dp"
        android:id="@+id/s"
        android:gravity="center_horizontal"
        android:textSize="20dp"
        android:textStyle="bold"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="25dp"
        android:id="@+id/c"
        android:textSize="15dp"
        android:textStyle="bold"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="55dp"
        android:id="@+id/d"
        android:textSize="15dp"/>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_gravity="left">

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/b1"
            android:text="UPDATE"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/b2"
            android:text="DELETE"/>

    </LinearLayout>

</LinearLayout>

MainActivity类

public class MainActivity extends AppCompatActivity
{
        String S1[]={"hello","1","2"},C1[]={"ello2","1","2"},D1[]={"hello3","3","4"};
        Button b1,b2;
        ListView lv;
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            lv=findViewById(R.id.lv);
            b1=findViewById(R.id.b1);
            b2=findViewById(R.id.b2);

            // display data
            CustomAdapter myAdapter=new CustomAdapter(this,S1,C1,D1);
            lv.setAdapter(myAdapter);

            lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                    Toast.makeText(MainActivity.this,"ello"+position,Toast.LENGTH_LONG).show();
                    b1.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            Toast.makeText(MainActivity.this,"ello",Toast.LENGTH_LONG).show();
                        }
                    });

                    b2.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            Toast.makeText(MainActivity.this,"ello",Toast.LENGTH_LONG).show();
                        }
                    });
                }
            });

        }
}

CustomAdapter类

public class CustomAdapter extends ArrayAdapter<String>
{
    private final Activity context;
    private final String Subject1[],Chapter1[],Details1[];


    public CustomAdapter(Activity context,String Subject1[], String Chapter1[], String Details1[])
    {
        super(context,R.layout.mylist,Subject1);
        this.context=context;
        this.Subject1=Subject1;
        this.Chapter1=Chapter1;
        this.Details1=Details1;
    }

    public View getView(int position, View view, ViewGroup parent)
    {
        LayoutInflater inflater=context.getLayoutInflater();
        view=inflater.inflate(R.layout.mylist, null);
        TextView s =view.findViewById(R.id.s);
        TextView c= view.findViewById(R.id.c);
        TextView d= view.findViewById(R.id.d);
        s.setText(Subject1[position]);
        c.setText(Chapter1[position]);
        d.setText(Details1[position]);
        return view;
    };
}

Answer 1

尝试一下：

在MainActivity中：

   public class MainActivity extends AppCompatActivity{
    String S1[]={"hello","1","2"},C1[]={"ello2","1","2"},D1[]={"hello3","3","4"};
    ListView lv;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv=findViewById(R.id.lv);

        // display data
        CustomAdapter myAdapter=new CustomAdapter(this,S1,C1,D1);
        lv.setAdapter(myAdapter);

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            // this click work for only on list items not work on list components 
          //   you have to do this functionality in your **CustomAdapter** for list components.  

            }
        });

    }
 }

现在，在CustomAdapter中：

 public class CustomAdapter extends ArrayAdapter<String>{
  private final Activity context;
  private final String Subject1[],Chapter1[],Details1[];


  public CustomAdapter(Activity context,String Subject1[], String Chapter1[], String Details1[])
{
    super(context,R.layout.mylist,Subject1);
    this.context=context;
    this.Subject1=Subject1;
    this.Chapter1=Chapter1;
    this.Details1=Details1;
}

public View getView(int position, View view, ViewGroup parent)
{
    LayoutInflater inflater=context.getLayoutInflater();
    view=inflater.inflate(R.layout.mylist, null);
    TextView s =view.findViewById(R.id.s);
    TextView c= view.findViewById(R.id.c);
    TextView d= view.findViewById(R.id.d);
    Button b1 = view.findViewById(R.id.b1);
    Button b2 = view.findViewById(R.id.b2);
    s.setText(Subject1[position]);
    c.setText(Chapter1[position]);
    d.setText(Details1[position]);

    // here you have to do click thing :

     b1.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(MainActivity.this,"HELLO BUTTON 1",Toast.LENGTH_LONG).show();
                    }
                });

      b2.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(MainActivity.this,"HELLO BUTTON 2",Toast.LENGTH_LONG).show();
                    }
                });

    return view;
};
 }

Answer 2

您可以在两个地方放置butonClick。

1：在适配器内部：-

    public class CustomAdapter extends ArrayAdapter<String>{
  private final Activity context;
  private final String Subject1[],Chapter1[],Details1[];


  public CustomAdapter(Activity context,String Subject1[], String Chapter1[], String Details1[])
{
    super(context,R.layout.mylist,Subject1);
    this.context=context;
    this.Subject1=Subject1;
    this.Chapter1=Chapter1;
    this.Details1=Details1;
}

public View getView(int position, View view, ViewGroup parent)
{
    LayoutInflater inflater=context.getLayoutInflater();
    view=inflater.inflate(R.layout.mylist, null);
    TextView s =view.findViewById(R.id.s);
    TextView c= view.findViewById(R.id.c);
    TextView d= view.findViewById(R.id.d);
    Button b1 = view.findViewById(R.id.b1);
    Button b2 = view.findViewById(R.id.b2);
    s.setText(Subject1[position]);
    c.setText(Chapter1[position]);
    d.setText(Details1[position]);




     button1.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                           //Button1 click here
                        Toast.makeText(getApplicationContext(),"BUTTON 1 Position : "+ position,Toast.LENGTH_LONG).show();

                        }
                    });

          button2.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                        //Button2 click here
Toast.makeText(getApplicationContext(),"BUTTON 2 Position : "+ position,Toast.LENGTH_LONG).show();
                        }
                    });

        return view;
    };
     }

2：在您的活动中：-

要在列表视图中放置一个ButtonClick侦听器，请首先使一个侦听器如下：

    public interface OnclickListener {
    void onButtonClickHere(int position);
}

然后在您的活动中：

ListAdapter adapter;
OnclickListener onclickListener;

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        init();
    }

 private void init() {
    onclickListener = this;
    filterNames = getResources().getStringArray(R.array.finalfilter_names);
    filterMethods = getResources().getStringArray(R.array.filter_method_names);

    listView = (ListView) 
       findViewById(R.id.idListView);

          adapter = new ListAdapter(groceryList, getApplicationContext(), onclickListener);


}

您可以在此处访问onclick

    @Override
public void onButtonClickHere(int position) {
    Filter filter = null;
    if(position == 0){
         filter = FilterPack.getAweStruckVibeFilter(this);
    }else if(position == 1){
         filter = FilterPack.getMarsFilter(this);
    }else if(position == 2){
         filter = FilterPack.getStarLitFilter(this);
    }
    filtered = bitmap.copy(bitmap.getConfig(), true);

    // apply filter
    imgImage.setImageBitmap(filter.processFilter(filtered));

    // struck mars starlit

}

然后在您的适配器中：

将此添加到您的构造函数中

OnclickListener onclickListener;


 public ListAdapter(List<ButtonsBean> horizontalGrocderyList, Context context,OnclickListener onclickListener ){
    this.buttonsBeanList = horizontalGrocderyList;
    this.context = context;
    this.onclickListener = onclickListener;  // Add this to your constructor
}

和getView()内

添加此行：

            onclickListener.onButtonClickHere(position);

Answer 3

使用

更新mylist.xml中的父布局。

android：descendantFocusability =“ blocksDescendants”

类似以下内容...

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

如果列表的任何行项目包含可聚焦或可单击的视图，则 OnItemClickListener无法正常工作。

我找到了解决方法here

或者，您可以尝试像这样将列表适配器的getView（）方法下的onClickListeners设置（将getView（）方法的int position参数设为final并在onclick（）方法中使用它）。只需将getView（）方法复制并粘贴到适配器中即可。

public View getView(final int position, View view, ViewGroup parent)
    {
        LayoutInflater inflater=context.getLayoutInflater();
        view=inflater.inflate(R.layout.mylist, null);
        TextView s =view.findViewById(R.id.s);
        TextView c= view.findViewById(R.id.c);
        TextView d= view.findViewById(R.id.d);
        s.setText(Subject1[position]);
        c.setText(Chapter1[position]);
        d.setText(Details1[position]);

        //Do like this
        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Do whatever you want here with the position

            }
        });
        b1.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(context,"BUTTON1 clicked: position=" + position,Toast.LENGTH_LONG).show();
                    }
                });

        b2.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(context,"BUTTON2 clicked: position=" + position,Toast.LENGTH_LONG).show();
                    }
                });
        return view;
    };

listview上的onitemclicklistener无法正常工作

3 个答案: