Listview和按钮隐藏

时间：2016-11-03 10:50:08

标签： java android listview button hidden

好吧，我试着解释一下。 我创建了一个应用程序，其中我有一个列表视图，其中每行还有两个按钮（我已经在此站点中发布了其他问题）。 问题是这样的： 两个按钮是“开始”和“停止”。当我点击开始，服务启动，当我点击停止时，此服务必须停止（我暂时没有实现该服务）。 所以，当我点击开始时，我想隐藏开始按钮，这样我就知道服务已经启动了。 我该怎么做？此外，它是以这种方式实现服务的正确选择吗？ 我已经选择了这个想法，因为当我决定停止它时我需要停止服务。

代码：

MainActivity.java 

public class MainActivity extends AppCompatActivity {

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

        //generate list
        ArrayList<String> list = new ArrayList<String>();
        list.add("item1");
        list.add("item2");

        //instantiate custom adapter
        android.widget.ListAdapter adapter = new ListAdapter(this,0,list);

        //handle listview and assign adapter
        ListView lView = (ListView)findViewById(R.id.list_item);
        lView.setAdapter(adapter);
    }


}

activity_main.xml中：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.sara.myapplication.MainActivity">


    <ListView
        android:id="@+id/list_item"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

row_item.xml：

<?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">

    <TextView
        android:text="Text"
        android:id="@+id/list_item_string"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5pt"
        android:layout_marginTop="2pt"
        android:textSize="10pt"
        android:layout_weight="0.49"/>


    <Button
        android:text="Start"
        android:id="@+id/start_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:text="Stop"
        android:id="@+id/stop_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toEndOf="@+id/start_button"/>

</LinearLayout>

ListAdapter.java 

public class ListAdapter extends ArrayAdapter<String> {

    private ArrayList<String> list;
    private int layout;
    private Context context;

    public ListAdapter(Context context, int resource, ArrayList<String> objects) {
        super(context, resource, objects);
        context = context;
        layout = resource;
        list = objects;
    }


    public View getView(final int position, View convertView, ViewGroup parent) {
        View view = convertView;
        if (view == null) {
            LayoutInflater inflater = LayoutInflater.from(getContext());
            view = inflater.inflate(R.layout.row_item, null);
        }

        //Handle TextView and display string from your list
        TextView listItemText = (TextView)view.findViewById(R.id.list_item_string);
        listItemText.setText(list.get(position));

        //Handle buttons and add onClickListeners
        Button deleteBtn = (Button)view.findViewById(R.id.stop_button);
        Button addBtn = (Button)view.findViewById(R.id.start_button);

        deleteBtn.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(), "delete - Button was clicked for list item " + position, Toast.LENGTH_SHORT).show();
                //do something
                notifyDataSetChanged();
            }
        });
        addBtn.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(), "start - Button was clicked for list item " + position, Toast.LENGTH_SHORT).show();
                notifyDataSetChanged();
            }
        });

        return view;

    }

}

5 个答案:

答案 0 :(得分：0)

你可以使用一些布尔标志值来改变点击按钮的可见性。

答案 1 :(得分：0)

如果在列表中有多个元素，则必须实现自定义适配器并为每个元素创建一个临时列表器。使用setTag和getTag。 CHange row_item.xml 

<?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">

    <TextView
        android:text="Text"
        android:id="@+id/list_item_string"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5pt"
        android:layout_marginTop="2pt"
        android:textSize="10pt"
        android:layout_weight="0.49"/>


    <Button
        android:text="Start"
        android:id="@+id/start_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="start"/>

    <Button
        android:text="Stop"
        android:id="@+id/stop_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toEndOf="@+id/start_button"
        android:onClick="stop"
        android:layout_marginLeft="10dp"
        android:layout_toRightOf="@+id/start_button" />

</LinearLayout>

在MainAcitivty 

public class MainActivity extends AppCompatActivity {

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

        //generate list
        ArrayList<String> list = new ArrayList<String>();
        list.add("item1");
        list.add("item2");

        //instantiate custom adapter
        ListAdapter adapter = new ListAdapter(this, 0, list);

        //handle listview and assign adapter
        ListView lView = (ListView)findViewById(R.id.list_item);
        lView.setAdapter(adapter);
    }

    public void start(View v){
        Button b = (Button) v;
        v.setVisibility(View.INVISIBLE);
    }

    public void stop(View v){

    }


}

ListAdapter 

public View getView(final int position, View convertView, ViewGroup parent) {
        View view = convertView;
        if (view == null) {
            LayoutInflater inflater = LayoutInflater.from(getContext());
            view = inflater.inflate(R.layout.row_item, null);
        }

        //Handle TextView and display string from your list
        TextView listItemText = (TextView)view.findViewById(R.id.list_item_string);
        listItemText.setText(list.get(position));

        //Handle buttons and add onClickListeners
        Button deleteBtn = (Button)view.findViewById(R.id.stop_button);
        Button addBtn = (Button)view.findViewById(R.id.start_button);

        return view;

    }

答案 2 :(得分：0)

addBtn.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(), "start - Button was clicked for list item " + position, Toast.LENGTH_SHORT).show();
                //do something
                addBtn.setVisibility(View.GONE);
                notifyDataSetChanged();
            }
        });

deleteBtn.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(), "delete - Button was clicked for list item " + position, Toast.LENGTH_SHORT).show();
                //do something
                addBtn.setVisibility(View.VISIBLE);
                notifyDataSetChanged();
            }
        });

以这种方式似乎正在运作

答案 3 :(得分：-1)

您需要使用setVisible(false)方法 例如：

addBtn.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            Toast.makeText(getContext(), "start - Button was clicked for list item " + position, Toast.LENGTH_SHORT).show();
            notifyDataSetChanged();
            addBtn.setVisible(false); // ← Hide the "Start button"
        }
    });

答案 4 :(得分：-1)

单击后隐藏开始按钮，

 addBtn.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            Toast.makeText(getContext(), "start - Button was clicked for list item " + position, Toast.LENGTH_SHORT).show();
            notifyDataSetChanged();
         addBtn.setVisibility(View.GONE);
        }
    });
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