Warning: file_get_contents(/data/phpspider/zhask/data//catemap/9/java/307.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181
Java 如何在ListView中的每一行上添加按钮?_Java_Android_Listview - Fatal编程技术网

Java 如何在ListView中的每一行上添加按钮?

Java 如何在ListView中的每一行上添加按钮?,java,android,listview,Java,Android,Listview,我试图在ListView中的每一行上实现按钮,但我看到了许多主题,并且没有成功地将代码添加到我的主题中。以下是我的主要活动: public class MainActivity extends AppCompatActivity { private ArrayAdapter<String> itemsAdapter; private ArrayList<String> items; private ImageButton formButton; private List

我试图在ListView中的每一行上实现按钮,但我看到了许多主题,并且没有成功地将代码添加到我的主题中。以下是我的主要活动:

public class MainActivity extends AppCompatActivity {

private ArrayAdapter<String> itemsAdapter;
private ArrayList<String> items;
private ImageButton formButton;
private ListView lvMain;

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

public void commonFunction() {
    lvMain = (ListView) findViewById(R.id.lvMain);
    items = new ArrayList<String>();
    readItems();
    itemsAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1,
            items);
    lvMain.setAdapter(itemsAdapter);
    formButton = (ImageButton) findViewById(R.id.btnPlus);
    formButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            setLayoutActivity();
        }
    });
}
}
public类MainActivity扩展了AppCompatActivity{
专用阵列适配器项适配器;
私有ArrayList项;
私有图像按钮formButton;
私有列表视图lvMain;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
commonFunction();
}
公共功能(){
lvMain=(ListView)findViewById(R.id.lvMain);
items=newarraylist();
readItems();
itemsAdapter=新阵列适配器(此,
android.R.layout.simple\u list\u item\u 1,
项目);
lvMain.setAdapter(itemsAdapter);
formButton=(ImageButton)findViewById(R.id.btnPlus);
formButton.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
setLayoutActivity();
}
});
}
}
以下是我的活动_main.xml:

<ListView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/lvMain"
    android:layout_above="@+id/btnPlus" />

<ImageButton
    android:layout_width="match_parent"
    android:layout_height="65dp"
    android:id="@+id/btnPlus"
    android:layout_alignParentBottom="true"
    app:srcCompat="@mipmap/ic_plus_foreground" />


有人知道怎么做吗?

使用自定义行布局文件创建自定义适配器,并在该行文件上添加按钮,然后将其绑定到列表/回收器视图。因此,它将在所有行中膨胀

在row_list.xml文件中添加以下代码

<ImageButton
android:layout_width="match_parent"
android:layout_height="65dp"
android:id="@+id/btnPlus"
android:layout_alignParentBottom="true"
app:srcCompat="@mipmap/ic_plus_foreground" />

CustomAdapter.java

public class CustomAdapter extends BaseAdapter {

private ArrayList data;
private static LayoutInflater inflater = null;


/*************  CustomAdapter Constructor *****************/
public CustomAdapter(ArrayList d) {

    /********** Take passed values **********/
    data = d;

    /***********  Layout inflater to call external xml layout () ***********/
    inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}

/******** What is the size of Passed Arraylist Size ************/
public int getCount() {

    if (data.size() <= 0)
        return 1;
    return data.size();
}

public Object getItem(int position) {
    return position;
}

public long getItemId(int position) {
    return position;
}

/********* Create a holder Class to contain inflated xml file elements *********/
public static class ViewHolder {
    public ImageButton button;

}

/****** Depends upon data size called for each row , Create each ListView row *****/
public View getView(int position, View convertView, ViewGroup parent) {

    View vi = convertView;
    ViewHolder holder;

    if (convertView == null) {

        /****** Inflate tabitem.xml file for each row ( Defined below ) *******/
        vi = inflater.inflate(R.layout.row_list, null);

        /****** View Holder Object to contain tabitem.xml file elements ******/

        holder = new ViewHolder();
        holder.button = (ImageView) vi.findViewById(R.id.btnPlus);

        /************  Set holder with LayoutInflater ************/
        vi.setTag(holder);
    } else
        holder = (ViewHolder) vi.getTag();

    holder.button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //Button click
        }
    });
    return vi;
}}
公共类CustomAdapter扩展了BaseAdapter{
私有数组列表数据;
专用静态充气机=空;
/*************自定义适配器构造函数*****************/
公共CustomAdapter(ArrayList d){
/**********接受传递的值**********/
数据=d;
/***********用于调用外部xml布局的布局充气器()***********/
充气器=(LayoutInflater)activity.getSystemService(Context.LAYOUT\u充气器\u SERVICE);
}
/********传递的Arraylist大小是多少************/
public int getCount(){

如果(data.size()使用自定义行布局文件创建自定义适配器,并在该行文件上添加按钮,然后将其绑定到列表/回收器视图。因此,它将在所有行中膨胀

在row_list.xml文件中添加以下代码

<ImageButton
android:layout_width="match_parent"
android:layout_height="65dp"
android:id="@+id/btnPlus"
android:layout_alignParentBottom="true"
app:srcCompat="@mipmap/ic_plus_foreground" />

CustomAdapter.java

public class CustomAdapter extends BaseAdapter {

private ArrayList data;
private static LayoutInflater inflater = null;


/*************  CustomAdapter Constructor *****************/
public CustomAdapter(ArrayList d) {

    /********** Take passed values **********/
    data = d;

    /***********  Layout inflater to call external xml layout () ***********/
    inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}

/******** What is the size of Passed Arraylist Size ************/
public int getCount() {

    if (data.size() <= 0)
        return 1;
    return data.size();
}

public Object getItem(int position) {
    return position;
}

public long getItemId(int position) {
    return position;
}

/********* Create a holder Class to contain inflated xml file elements *********/
public static class ViewHolder {
    public ImageButton button;

}

/****** Depends upon data size called for each row , Create each ListView row *****/
public View getView(int position, View convertView, ViewGroup parent) {

    View vi = convertView;
    ViewHolder holder;

    if (convertView == null) {

        /****** Inflate tabitem.xml file for each row ( Defined below ) *******/
        vi = inflater.inflate(R.layout.row_list, null);

        /****** View Holder Object to contain tabitem.xml file elements ******/

        holder = new ViewHolder();
        holder.button = (ImageView) vi.findViewById(R.id.btnPlus);

        /************  Set holder with LayoutInflater ************/
        vi.setTag(holder);
    } else
        holder = (ViewHolder) vi.getTag();

    holder.button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //Button click
        }
    });
    return vi;
}}
公共类CustomAdapter扩展了BaseAdapter{
私有数组列表数据;
专用静态充气机=空;
/*************自定义适配器构造函数*****************/
公共CustomAdapter(ArrayList d){
/**********接受传递的值**********/
数据=d;
/***********用于调用外部xml布局的布局充气器()***********/
充气器=(LayoutInflater)activity.getSystemService(Context.LAYOUT\u充气器\u SERVICE);
}
/********传递的Arraylist大小是多少************/
public int getCount(){

如果(data.size()我认为这就是您需要的-为列表视图中的行创建一个单独的布局。然后创建一个自定义适配器,将此布局添加为行布局,然后将此适配器设置为列表视图。以下是详细信息和示例:


我认为这就是您需要的-为列表视图中的行创建一个单独的布局。然后创建一个自定义适配器,将此布局添加为行布局,然后将此适配器设置为列表视图。以下是详细信息和示例:


将自定义适配器装入板条箱,并将其与ListView绑定。 为适配器中的每一行充气自定义布局。 您可以将按钮放在自定义布局文件中

public class CustomAdapter extends ArrayAdapter<String> {

private Context context;

private int singleRowLayoutId;

public CustomAdapter(Context context, int singleRowLayoutId, String []titles, String []desc, int []images ) {
    super(context, singleRowLayoutId,titles);
    this.context=context;
    this.singleRowLayoutId=singleRowLayoutId; //custom row layout for list view item
}

@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

    View row=convertView;
    CustomViewHolder holder=null;
    if(row==null) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        //view object of single row of list view
        row = inflater.inflate(singleRowLayoutId, parent, false);
        //by using holder, we make sure that findViewById() is not called every time.
        holder=new CustomViewHolder(row);
        row.setTag(holder);
    }
    else
    {
        holder=(CustomViewHolder)row.getTag();
    }

    return row;
}

private class CustomViewHolder {
    private ImageButton mbtn;

    CustomViewHolder(View view)
    {
        mbtn=(ImageButton)view.findViewById(R.id.btn);

        mbtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //handle button click here
        }
    });
    }
}
公共类CustomAdapter扩展了ArrayAdapter{
私人语境;
私有int singleRowLayoutId;
公共CustomAdapter(上下文上下文、int-singleRowLayoutId、字符串[]标题、字符串[]说明、int[]图像){
超级(上下文、单行布局、标题);
this.context=context;
this.singleRowLayoutId=singleRowLayoutId;//列表视图项的自定义行布局
}
@非空
@凌驾
公共视图getView(int位置,@Nullable视图convertView,@NonNull视图组父级){
视图行=转换视图;
CustomViewHolder=null;
if(行==null){
LayoutFlater充气器=(LayoutFlater)context.getSystemService(context.LAYOUT\u充气器\u服务);
//列表视图的单行的视图对象
行=充气机。充气(singleRowLayoutId,父级,false);
//通过使用holder,我们确保不会每次调用findViewById()。
holder=新的CustomViewHolder(行);
row.setTag(支架);
}
其他的
{
holder=(CustomViewHolder)行。getTag();
}
返回行;
}
私有类CustomViewHolder{
专用图像按钮mbtn;
CustomViewHolder(视图)
{
mbtn=(ImageButton)view.findViewById(R.id.btn);
mbtn.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
//把手按钮点击这里
}
});
}
}

将自定义适配器装入板条箱并与ListView绑定。 为适配器中的每一行充气自定义布局。 您可以将按钮放在自定义布局文件中

public class CustomAdapter extends ArrayAdapter<String> {

private Context context;

private int singleRowLayoutId;

public CustomAdapter(Context context, int singleRowLayoutId, String []titles, String []desc, int []images ) {
    super(context, singleRowLayoutId,titles);
    this.context=context;
    this.singleRowLayoutId=singleRowLayoutId; //custom row layout for list view item
}

@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

    View row=convertView;
    CustomViewHolder holder=null;
    if(row==null) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        //view object of single row of list view
        row = inflater.inflate(singleRowLayoutId, parent, false);
        //by using holder, we make sure that findViewById() is not called every time.
        holder=new CustomViewHolder(row);
        row.setTag(holder);
    }
    else
    {
        holder=(CustomViewHolder)row.getTag();
    }

    return row;
}

private class CustomViewHolder {
    private ImageButton mbtn;

    CustomViewHolder(View view)
    {
        mbtn=(ImageButton)view.findViewById(R.id.btn);

        mbtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //handle button click here
        }
    });
    }
}
公共类CustomAdapter扩展了ArrayAdapter{
私人语境;
私有int singleRowLayoutId;
公共CustomAdapter(上下文上下文、int-singleRowLayoutId、字符串[]标题、字符串[]说明、int[]图像){
超级(上下文、单行布局、标题);
this.context=context;
this.singleRowLayoutId=singleRowLayoutId;//列表视图项的自定义行布局
}
@非空
@凌驾
公共视图getView(int位置,@Nullable视图convertView,@NonNull视图组父级){
视图行=转换视图;
CustomViewHolder=null;
if(行==null){
LayoutFlater充气器=(LayoutFlater)context.getSystemService(context.LAYOUT\u充气器\u服务);
//列表视图的单行的视图对象
行=充气机。充气(singleRowLayoutId,父级,false);
//通过使用holder,我们确保不会每次调用findViewById()。
holder=新的CustomViewHolder(行);
row.setTag(支架);
}
其他的
{
持有人=(C)