取消選中所有選中的複選框onBackPressed在android

我有一個列表視圖與複選框。我在一個EventHandler類中安排我的列表視圖。我想在按下後退按鈕時取消選中所有複選框。我在另一個活動中調用onBackPressed方法。所以我應該編寫另一個函數來返回一個視圖。請幫忙。我搜索了很多，但我找不到確切的解決方案。取消選中所有選中的複選框onBackPressed在android

課內：我得到一個Viewholder的數組列表來取消複選框的選擇。

private ArrayList<ViewHolder> mViewHolders = new ArrayList<>();

ViewHolder：

private static class ViewHolder { 
    TextView topView; 
    TextView bottomView; 
    TextView dateView; 
    ImageView icon; 
    CheckBox checkBox; 
}

getView：

public View getView(int position, View convertView, ViewGroup parent) { 
    final ViewHolder mViewHolder; 
    int num_items = 0; 
    String temp = mFileMang.getCurrentDir(); 
    File file = new File(temp + "/" + mDataSource.get(position)); 
    String[] list = file.list(); 

    if(list != null) 
     num_items = list.length; 

    if(convertView == null) { 
     LayoutInflater inflater = (LayoutInflater) mContext. 
      getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = inflater.inflate(R.layout.tablerow, parent, false); 

     mViewHolder = new ViewHolder(); 
     mViewHolder.topView =(TextView)convertView.findViewById(R.id.top_view); 
     mViewHolder.bottomView = (TextView)convertView.findViewById(R.id.bottom_view); 
     mViewHolder.dateView =(TextView) convertView.findViewById(R.id.date_view); 
     mViewHolder.icon = (ImageView)convertView.findViewById(R.id.row_image); 
     mViewHolder.checkBox = (CheckBox) convertView.findViewById(R.id.row_checkBox); 
     convertView.setTag(mViewHolder); 

     } else { 
      mViewHolder = (ViewHolder)convertView.getTag(); 

     } // I also make some text setting inside this.

來源

2016-07-14 gunescelil

在activity中創建一個回調函數，在onBackPressed（）中，f ire回調方法，在您的適配器中實現回調並在回調方法體中取消選中複選框。 – EagleEye

但是也要考慮您希望禁用一個複選框或僅顯示或僅顯示所有這些複選框的情況。 –

我想要清除所有這些 – gunescelil

按我的意見的工作流程應該是這樣的：
您的活動：

public class MainActivity extends AppCompatActivity { 

private ListView mListView; 
private CustomAdapter mCustomAdapter; 
private List<YourCustomClass> mYourCustomItems; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    setContentView(R.layout.activity_main); 
    // don't forget to init everything you need 
    mYourCustomItems = new ArrayList<>(); 
    mListView = (ListView) findViewById(R.id.list_view); 
    mCustomAdapter = new CustomAdapter(mYourCustomItems); 
    mListView.setAdapter(mCustomAdapter); 
} 


@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    switch (keyCode){ 
     case KeyEvent.KEYCODE_BACK: 
      //all your needed stuff 
      for (YourCustomClass item : mYourCustomItems){ 
       item.setChecked(false); 
      } 
      mCustomAdapter.notifyDataSetChanged(); 
      return true; 
    } 
    return super.onKeyDown(keyCode, event); 
} 

private class CustomAdapter extends BaseAdapter{ 

    private List<YourCustomClass> mYourCustomClasses; 

    public CustomAdapter(List<YourCustomClass> yourCustomClasses) { 
     mYourCustomClasses = yourCustomClasses; 
    } 

    @Override 
    public int getCount() { 
     return mYourCustomClasses.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return mYourCustomClasses.get(position); 
    } 

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

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     //all view holder related stuff and other initialization 
     CheckBox checkBox = itemView.findViewById(R.id.checkbox); 
     checkBox.setChecked(mYourCustomClasses.get(position).isChecked()); 
     return convertView; 
    } 
}

來源

2016-07-14 11:21:23

謝謝Yurii比我需要更多。 – gunescelil

我建議你複選框值存儲在PREF和改變複選框的值onbackpress

要商店布爾數組中縣

public boolean storebaray(Boolean[] array, String arrayNam, Context mContext) { 

    SharedPreferences prefs = mContext.getSharedPreferences("prefname", 0); 
    SharedPreferences.Editor editor = prefs.edit(); 
    editor.putInt(arrayNam +"size", array.length); 

    for(int i=0;i<array.length;i++) 
     editor.putBoolean(arrayNam + "_" + i, array[i]); 

    return editor.commit(); 
}

的你可以加載陣列

public Boolean[] loadAry(String arrayNam, Context mContext) { 

    SharedPreferences prefs = mContext.getSharedPreferences("prefname", 0); 
    int size = prefs.getInt(arrayNam + "size", 0); 
    Boolean array[] = new Boolean[size]; 
    for(int i=0;i<size;i++) 
     array[i] = prefs.getBoolean(arrayNam + "_" + i, false); 

    return array; 
}

然後onBackPressed檢查值

來源

2016-07-14 11:12:56

取消選中所有選中的複選框onBackPressed在android

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