Android 遍历 GridView 子元素

Question

我正在创建一个数独应用程序，但遇到了问题 -- 我试图仅隐藏网格上的某些元素，我可以使用 getView() 来实现，但任何时候我使用 EditText 更改值并向下移动键盘，再次调用 getView() 并擦除输入，所以我试图找到解决它的方法。我相信这样做的方法是简单地遍历元素并在 onCreate() 中隐藏某些元素，尽管我在获取视图的任何子元素时遇到问题。我可以使用 getChildAt(i)，尽管这只是 returns 数据，而不是视图本身，所以我无法更改可见性。我也尝试过使用以前 Whosebug 答案中的 getChildAt() 解决方案，但它似乎不起作用。

这是我的代码：

主要活动：

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.GridView;
import android.widget.TextView;

import static java.lang.Boolean.FALSE;
import static java.lang.Boolean.TRUE;

public class MainActivity extends AppCompatActivity {

    public GridView gridView;
    public String[] items = new String[]{
            "5","3","4","6","7","8","9","1","2",
            "6","7","2","1","9","5","3","4","8",
            "1","9","8","3","4","2","5", "6","7",
            "8","5","9","7","6","1","4","2","3",
            "4","2","6","8","5","3","7","9","1",
            "7","1","3","9","2", "4","8","5","6",
            "9","6","1","5","3","7","2","8","4",
            "2","8","7","4","1","9","6","3","5",
            "3","4","5", "2","8","6","1","7","9"
    };

    public Boolean[] masker = new Boolean[]{
            TRUE, TRUE, FALSE, FALSE, TRUE, FALSE, FALSE, FALSE, FALSE,
            TRUE, FALSE, FALSE, TRUE, TRUE, TRUE, FALSE, FALSE, FALSE,
            FALSE, TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, TRUE, FALSE,
            TRUE, FALSE, FALSE, FALSE, TRUE, FALSE, FALSE, FALSE, TRUE,
            TRUE, FALSE, FALSE, TRUE, FALSE, TRUE, FALSE, FALSE, TRUE,
            TRUE, FALSE, FALSE, FALSE, TRUE, FALSE, FALSE, FALSE, TRUE,
            FALSE, TRUE, FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, FALSE,
            FALSE, FALSE, FALSE, TRUE, TRUE, TRUE, FALSE, FALSE, TRUE,
            FALSE, FALSE, FALSE, FALSE, TRUE, FALSE, FALSE, TRUE, TRUE,
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        gridView = (GridView) this.findViewById(R.id.myGridView);
        CustomGridAdapter gridAdapter = new CustomGridAdapter(MainActivity.this, items, masker);
        gridView.setAdapter(gridAdapter);

        final int size = gridAdapter.getCount();
        for(int i = 0; i < size; i++) {
            ViewGroup gridChild = (ViewGroup) gridView.getChildAt(i);
            int childSize = gridChild.getChildCount();
            for(int k = 0; k < childSize; k++) {
                gridChild.getChildAt(k);
            }
        }

    }


}

自定义网格适配器：

    import android.content.Context;
    import android.text.Editable;
    import android.text.TextWatcher;
    import android.view.KeyEvent;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.view.inputmethod.EditorInfo;
    import android.view.inputmethod.InputMethodManager;
    import android.widget.BaseAdapter;
    import android.widget.EditText;
    import android.widget.TextView;

    import static java.lang.Boolean.FALSE;

    public class CustomGridAdapter extends BaseAdapter {


            private Context context;
            private String[] items;
            private Boolean[] masker;
            private String input;
            private EditText t;
            LayoutInflater inflater;

            public CustomGridAdapter(Context context, String[] items, Boolean[] masker ){
                this.context = context;
                this.items = items;
                this.masker = masker;

                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);
                }

                t = (EditText) convertView.findViewById(R.id.editCell);

                if(masker[position]){
                    t.setText(items[position]);
                    t.setEnabled(FALSE);
                }else{
                    t.setText("");
                }

                if( (position % 9 != 0) && (position % 3 == 0) ){
                    t.setBackgroundResource(R.drawable.columnborder);
                }
                if( (position >= 18 && position <= 26) || (position >= 45 && position <= 53) ){
                    t.setBackgroundResource(R.drawable.rowborder);
                }
                if( (position == 21 || position == 24 || position == 48 || position == 51 ) ){
                    t.setBackgroundResource(R.drawable.cornerborder);
                }

                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; }


    }

本质上，我只想隐藏数独网格的某些元素，但我认为我不能在 getView() 中这样做，因为它会因为 t.setText(" ");.

有什么建议吗？

Answer 1

你的做法是完全错误的。你不应该改变 GridView 中的视图，除了在 getView 期间。您可以通过其适配器及其保存的数据来操作 GridView。例如，假设您有一个由字符串列表支持的适配器，并且您想要隐藏所有其他字符串。然后你有两个选择 - 更改列表以仅包含所有其他字符串，或者更改它包含的数据以同时包含字符串和可见性，并在 getView 中同时接受这两者。

GridView（或 ListView 或 RecyclerView）的全部要点在于它是一个数据支持的视图，将回收以匹配数据。如果您开始尝试自己操纵视图，那会很糟糕。不要那样做 - 操作数据，然后告诉视图自行更新。

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