如何在GridView中獲取TextView項目

我有一個用戶可以選擇的數字列表。選擇一個號碼後，我想要保存該號碼的選定狀態，並且能夠在應用程序重新啓動時恢復這些號碼的狀態。如何在GridView中獲取TextView項目

當我調用onCreateView時，我很難在GridView中恢復它們的狀態。我試過撥打gridView.getChildCount()，我注意到它返回0.我已經閱讀了許多類似問題的主題，並嘗試了他們的答案，但沒有成功。我已經在這一兩天了。

Fragment1.java：

public class Fragment1 extends Fragment implements OnItemClickListener { 

public static final String ARG_SECTION_NUMBER = "section_number"; 

private static final int START_NUM = 1; 
private static final int END_NUM = 59; 
public static boolean[] num_select = new boolean[END_NUM - START_NUM + 1]; 

private static GridView gridView; 
private static NumberAdapter adapter; 

public Fragment1() { 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

    View rootView = inflater.inflate(R.layout.fragment_1, container, false); 

    gridView = (GridView) rootView.findViewById(R.id.gridview_number); 

    adapter = new NumberAdapter(getActivity(), START_NUM, END_NUM); 
    gridView.setAdapter(adapter); 
    //gridView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE); 

    gridView.setOnItemClickListener((OnItemClickListener) this); 

    // ************* I NEED TO BE ABLE TO RESTORE THE NUMBER STATE HERE ******* 
//restoreNumbers(); 

    return rootView; 
} 

@Override 
public void onItemClick(AdapterView<?> parent, View v, int position, long id) { 

num_select[position] = !num_select[position]; 

    if (num_select[position]) 
    { 
     v.getBackground().setColorFilter(Color.rgb(210, 230, 230), 
    } 
    else 
    { 
     v.getBackground().clearColorFilter();   
    }  
}

NumberAdapter.java：

public class NumberAdapter extends BaseAdapter { 
private Context context; 
private int min_num; 
private int max_num;  

public NumberAdapter(Context c, int num1, int num2) { 
    this.context = c;   
    this.min_num = num1; 
    this.max_num = num2; 

    total_num = max_num - min_num + 1;  
}  

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

    TextView textView; 

    if(convertView == null) 
    { 
     textView = new TextView(context); 
     textView.setLayoutParams(new GridView.LayoutParams(GridView.AUTO_FIT, 85)); 
     textView.setTextSize(18.0f); 
     textView.setGravity(0x11); 
    } 
    else 
    { 
     textView = (TextView) convertView; 
    }  

    textView.setText(Integer.toString(position)); 
    textView.setBackgroundResource(R.drawable.number_deselect); 

    return textView; 
} 

public int getCount() { 
    return total_num; 
} 

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

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

}

來源

2013-10-13 Tuon Can

我發現我的回答感謝這個thread。基本上你需要創建一個addOnGlobalLayoutListener，並在GridView完成繪製後調用getChildAt。如果你調用它太早，它將返回null視圖。

ViewTreeObserver vto = tv.getViewTreeObserver(); 
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
    @Override 
    public void onGlobalLayout() { 
     TextView textView = (TextView) gridView.getChildAt(i); 
     textView.getBackground().setColorFilter(Color.rgb(210, 230, 230), PorterDuff.Mode.MULTIPLY); 
    } 
});

來源

2013-10-13 10:38:23

如何在GridView中獲取TextView項目

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