Android的 - 的GridView使用自定义BaseAdapter，创造onclicklistener [英] Android - Gridview with Custom BaseAdapter, create onclicklistener

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问题描述

我创建了显示英文字母的GridView。我填充使用自定义BaseAdapter一个字符串数组GridView的。

我想要做的是能获得点击单元格的值（字母）。为了验证它的工作原理，我创建了一个TextView的，我想，当一个项目（小区）用户点击与选定单元格的值

设置TextView的文本

我已经不工作的尝试。这里是我的code：

activity_main.xml中 

 ＆LT;的RelativeLayout的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns：工具=htt​​p://schemas.android.com/tool​​s
    机器人：ID =@ + ID /容器
    机器人：layout_width =match_parent
    机器人：layout_height =match_parent
    工具：上下文=。MainActivity
    工具：忽略=MergeRootFrame＆GT;    ＆LT; GridView控件
        机器人：layout_width =WRAP_CONTENT
        机器人：layout_height =WRAP_CONTENT
        机器人：ID =@ + ID / myGridView
        机器人：layout_alignParentTop =真
        机器人：layout_alignParentLeft =真
        机器人：为numColumns =7/＆GT;    ＆LT;的TextView
        机器人：layout_width =WRAP_CONTENT
        机器人：layout_height =WRAP_CONTENT
        机器人：textAppearance =机器人：ATTR / textAppearanceLarge
        机器人：文字=大文本
        机器人：ID =@ + ID /反馈
        机器人：layout_alignParentBottom =真
        机器人：layout_centerHorizo​​ntal =真/＆GT;
＆LT; / RelativeLayout的＆GT;

cell.xml 

 ＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT; LinearLayout中的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    机器人：layout_width =WRAP_CONTENT
    机器人：layout_height =WRAP_CONTENT＆GT;    ＆LT;按钮
        机器人：ID =@ + ID / grid_item
        机器人：layout_gravity =中心
        机器人：textAppearance =机器人：ATTR / textAppearanceMedium
        机器人：layout_width =WRAP_CONTENT
        机器人：layout_height =WRAP_CONTENT
        机器人：文字=05
        机器人：TEXTSIZE =20SP
        机器人：启用=真
        机器人：可点击=真正的＆GT;
    ＆LT; /按钮＆GT;＆LT; / LinearLayout中＆GT;

MainActivity 

 公共类MainActivity延伸活动{    私人TextView的文本;
    私人GridView控件GridView控件;
    私人最终的String []项目=新的String [] {A，B，C，D，E，F，G，H，I，J 
            K，L，M，N，O，P，Q，R，S，T，U，V，W ，X，Y，Z};    @覆盖
    保护无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;        文字=（TextView的）findViewById（R.id.feedback）;        GridView控件=（GridView控件）this.findViewById（R.id.myGridView）;
        CustomGridAdapter gridAdapter =新CustomGridAdapter（MainActivity.this，项目）;
        gridView.setAdapter（gridAdapter）;
        gridView.setOnItemClickListener（新AdapterView.OnItemClickListener（）{
            @覆盖
            公共无效onItemClick（适配器视图＆LT;＆GT;母公司，观景，INT位置，长的id）{
                text.setText（（字符串）（gridView.getItemAtPosition（位置）））;
                Log.i（ITEM_CLICKED，+（字符串）（gridView.getItemAtPosition（位置）））;
            }
        }）;    }
}

CustomGridAdapter 

 公共类CustomGridAdapter延伸BaseAdapter {    私人上下文的背景下;
    私有String []项目;
    LayoutInflater吹气;    公共CustomGridAdapter（上下文的背景下，字符串[]项）{
        this.context =背景;
        this.items =物品;
        吹气=（LayoutInflater）this.context.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
    }    公共查看getView（INT位置，查看convertView，父母的ViewGroup）{        如果（convertView == NULL）{
            convertView = inflater.inflate（R.layout.cell，NULL）;
        }
        Button按钮=（按钮）convertView.findViewById（R.id.grid_item）;
        button.setText（项目[位置]）;        返回convertView;
    }    @覆盖
    公众诠释的getCount（）{
        返回items.length;
    }    @覆盖
    公共对象的getItem（INT位置）{
        返回项目[位置]
    }    @覆盖
    众长getItemId（INT位置）{
        返回的位置;
    }
}

我究竟做错了什么？

修改：看来这个gridView.setOnItemClickListener（...）;不叫/执行。我已经改成了这个以检查它，我什么也看不到在logcat中。

  gridView.setOnItemClickListener（新AdapterView.OnItemClickListener（）{
            @覆盖
            公共无效onItemClick（适配器视图＆LT;＆GT;母公司，观景，INT位置，长的id）{
                Log.i（ON_ITEM_CLICK_LISTENER，项点击）;
            }
        }）;


解决方案

在你的情况的问题是，按钮被消耗点击它不会给GridView控件。我看到两个选项：


  1. 最简单的一种：在 cell.xml 有这些属性的按钮：机器人：可点击=FALSE和机器人：可聚焦=FALSE

  2. 系统格罗索-modo的：将活动作为参数传递给适配器，从暴露 MainActivity 的公共方法。如果你想重新使用的适配器，然后发送一个抽象类型的活动或接口。

东西为：

 公共类MainActivity延伸活动{
    私人TextView的文本;
    私人GridView控件GridView控件;
    私人最终的String []项目=新的String [] {A，B，C，D，E，F，G，H，I，J 
            K，L，M，N，O，P，Q，R，S，T，U，V，W ，X，Y，Z};    @覆盖
    保护无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;        文字=（TextView的）findViewById（R.id.feedback）;        GridView控件=（GridView控件）this.findViewById（R.id.myGridView）;
        CustomGridAdapter gridAdapter =新CustomGridAdapter（MainActivity.this，项目）;
        gridView.setAdapter（gridAdapter）;    }    公共无效itemClicked（INT位置）{
        text.setText（项目[位置]）;
    }
}

和在你的适配器：

 公共类CustomGridAdapter延伸BaseAdapter {    私人MainActivity语境;
    私有String []项目;
    LayoutInflater吹气;    公共CustomGridAdapter（MainActivity背景下，字符串[]项）{
        this.context =背景;
        this.items =物品;
        吹气=（LayoutInflater）this.context.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
    }    公共查看getView（最终诠释的立场，观点convertView，父母的ViewGroup）{        如果（convertView == NULL）{
            convertView = inflater.inflate（R.layout.cell，NULL）;
        }
        Button按钮=（按钮）convertView.findViewById（R.id.grid_item）;
        button.setText（项目[位置]）;
        button.setOnClickListener（新OnClickListener（）{            @覆盖
            公共无效的onClick（视图v）{
                context.itemClicked（位置）;
            }
        }）;        返回convertView;
    }    @覆盖
    公众诠释的getCount（）{
        返回items.length;
    }    @覆盖
    公共对象的getItem（INT位置）{
        返回项目[位置]
    }    @覆盖
    众长getItemId（INT位置）{
        返回的位置;
    }
}

I have created a gridview which displays the letters of the alphabet. I populate the gridview with a string array using a custom BaseAdapter.

What i want to do is to be able to get the value (letter) of the clicked cell. In order to verify that it works, i have created a TextView and i want when the user clicks on an item (cell) to set the text of the TextView with the value of the selected cell

I have made an attempt which doesn't work. Here is my code:

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    tools:ignore="MergeRootFrame" >

    <GridView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/myGridView"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:numColumns="7" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Large Text"
        android:id="@+id/feedback"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

cell.xml

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

    <Button
        android:id="@+id/grid_item"
        android:layout_gravity="center"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="05"
        android:textSize="20sp"
        android:enabled="true"
        android:clickable="true">
    </Button>

</LinearLayout>

MainActivity

public class MainActivity extends Activity {

    private TextView text;
    private GridView gridView;
    private final String[] items = new String[]{"A", "B", "C", "D", "E", "F", "G", "H", "I", "J",
            "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"};

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

        text = (TextView) findViewById(R.id.feedback);

        gridView = (GridView) this.findViewById(R.id.myGridView);
        CustomGridAdapter gridAdapter = new CustomGridAdapter(MainActivity.this, items);
        gridView.setAdapter(gridAdapter);
        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                text.setText((String) (gridView.getItemAtPosition(position)));
                Log.i("ITEM_CLICKED", "" + (String) (gridView.getItemAtPosition(position)));
            }
        });

    }
}

CustomGridAdapter

public class CustomGridAdapter extends BaseAdapter {

    private Context context;
    private String[] items;
    LayoutInflater inflater;

    public CustomGridAdapter(Context context, String[] items) {
        this.context = context;
        this.items = items;
        inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public View getView(int position, View convertView, ViewGroup parent) {

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.cell, null);
        }
        Button button = (Button) convertView.findViewById(R.id.grid_item);
        button.setText(items[position]);

        return convertView;
    }

    @Override
    public int getCount() {
        return items.length;
    }

    @Override
    public Object getItem(int position) {
        return items[position];
    }

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

What am i doing wrong?

Edit: It seems that the gridView.setOnItemClickListener(...); is not called/executed. I have changed it to this in order to check it and i see nothing in the logcat.

gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Log.i("ON_ITEM_CLICK_LISTENER", "item clicked");
            }
        });

解决方案

The problem in your case is that the button is consuming the click and it doesn't get to GridView. I see two options:

  1. The easy one: in cell.xml have these properties for your Button: android:clickable="false" and android:focusable="false"
  2. A grosso-modo: send the Activity as parameter to adapter and expose a public method from MainActivity. If you think of re-using the adapter, then send an abstract type of activity or an interface.

Something as:

public class MainActivity extends Activity {
    private TextView text;
    private GridView gridView;
    private final String[] items = new String[]{"A", "B", "C", "D", "E", "F", "G", "H", "I", "J",
            "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"};

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

        text = (TextView) findViewById(R.id.feedback);

        gridView = (GridView) this.findViewById(R.id.myGridView);
        CustomGridAdapter gridAdapter = new CustomGridAdapter(MainActivity.this, items);
        gridView.setAdapter(gridAdapter);

    }

    public void itemClicked(int position) {
        text.setText(items[position]);
    }
}

and in your adapter:

public class CustomGridAdapter extends BaseAdapter {

    private MainActivity context;
    private String[] items;
    LayoutInflater inflater;

    public CustomGridAdapter(MainActivity context, String[] items) {
        this.context = context;
        this.items = items;
        inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public View getView(final int position, View convertView, ViewGroup parent) {

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.cell, null);
        }
        Button button = (Button) convertView.findViewById(R.id.grid_item);
        button.setText(items[position]);
        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                context.itemClicked(position);
            }
        });

        return convertView;
    }

    @Override
    public int getCount() {
        return items.length;
    }

    @Override
    public Object getItem(int position) {
        return items[position];
    }

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

这篇关于Android的 - 的GridView使用自定义BaseAdapter，创造onclicklistener的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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