android - 将不可见的复选框设置为在 ListView 中可见

Question

我在 ListView 中有一个不可见的复选框，我想让它可见。但是，无法实现它。看看下面的代码 fragment :

列表 Activity :-

public class SelectDateRangeActivity extends AppCompatActivity {

    ListView mOptionsList;
    LogRangeOptionsAdapter mAdapter;

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

        mOptionsList = (ListView) findViewById(R.id.date_range_options_list);
        mAdapter = new LogRangeOptionsAdapter(this, R.layout.date_range_option_list_item, getResources().getStringArray(R.array.image_log_date_filter_options));
        mOptionsList.setAdapter(mAdapter);
    }

    @Override
    public void onResume() {
        super.onResume();

        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            String selectedOption = extras.getString(Utility.EXTRA_LOG_SELECTED_DATE_RANGE);
            if (selectedOption.equalsIgnoreCase(getResources().getStringArray(R.array.image_log_date_filter_options)[0])){
                final View view = mOptionsList.getAdapter().getView(0, null, mOptionsList);
                CheckBox c = (CheckBox) view.findViewById(R.id.image_log_checkbox);
                c.setVisibility(View.VISIBLE);
                c.setChecked(true);
                mAdapter.notifyDataSetChanged();
            }

            if (selectedOption.equalsIgnoreCase(getResources().getStringArray(R.array.image_log_date_filter_options)[1])){
                final View view = mOptionsList.getAdapter().getView(1, null, mOptionsList);
                CheckBox c = (CheckBox) view.findViewById(R.id.image_log_checkbox);
                c.setVisibility(View.VISIBLE);
                c.setChecked(true);
                mAdapter.notifyDataSetChanged();
            }

            if (selectedOption.equalsIgnoreCase(getResources().getStringArray(R.array.image_log_date_filter_options)[2])){
                final View view = mOptionsList.getAdapter().getView(0, null, mOptionsList);
                CheckBox c = (CheckBox) view.findViewById(R.id.image_log_checkbox);
                c.setVisibility(View.VISIBLE);
                c.setChecked(true);
                mAdapter.notifyDataSetChanged();
            }

            if (selectedOption.equalsIgnoreCase(getResources().getStringArray(R.array.image_log_date_filter_options)[3])){
                final View view = mOptionsList.getAdapter().getView(0, null, mOptionsList);
                CheckBox c = (CheckBox) view.findViewById(R.id.image_log_checkbox);
                c.setVisibility(View.VISIBLE);
                c.setChecked(true);
                mAdapter.notifyDataSetChanged();
            }
        }
    }
}

适配器:-

public class LogRangeOptionsAdapter extends ArrayAdapter<String> {

    Context mAdapterContext;
    String[] mItems;

    public LogRangeOptionsAdapter(Context context, int resource, String[] objects) {
        super(context, resource, objects);
        this.mAdapterContext = context;
        this.mItems = objects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) mAdapterContext.getSystemService(mAdapterContext.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.date_range_option_list_item, parent, false);
        }

        TextView mTitleText = (TextView) convertView.findViewById(R.id.date_range_option_text);
        mTitleText.setText(mItems[position]);
        final String titleText = mTitleText.getText().toString();

        convertView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent returnOptionIntent = new Intent(mAdapterContext, ImageLogActivity.class);
                returnOptionIntent.putExtra(Utility.EXTRA_LOG_DATE_RANGE_OPTION, titleText);
                Activity activity = (Activity) mAdapterContext;
                activity.setResult(Utility.INTENT_IMAGE_LOG_OPTIONS_CODE, returnOptionIntent);
                activity.finish();
                activity.overridePendingTransition(R.anim.anim_slide_in_left, R.anim.anim_slide_out_left);
            }
        });

        return convertView;
    }
}

选择日期范围 xml:-

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    tools:context="com.sigue.sigueagent.SelectDateRangeActivity">

    <ListView
        android:id="@+id/date_range_options_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </ListView>

</RelativeLayout>

日期范围选项:-

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="@dimen/item_date_range_padding_top"
    android:paddingBottom="@dimen/item_date_range_padding_bottom">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/date_range_option_text"
        android:layout_alignBottom="@+id/image_log_checkbox"
        android:layout_alignTop="@+id/image_log_checkbox"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:gravity="center" />

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/image_log_checkbox"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:visibility="invisible"/>

</RelativeLayout>

Answer 1

所以我通过在适配器中设置可见或不可见来解决这个问题，而不是尝试在实际 Activity 中这样做，这里是更改的 Activity 。希望它能帮助别人:)!

public class SelectDateRangeActivity extends AppCompatActivity {

    ListView mOptionsList;
    LogRangeOptionsAdapter mAdapter;
    String mSelectedOption;

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

        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            mSelectedOption = extras.getString(Utility.EXTRA_LOG_SELECTED_DATE_RANGE);
        }

        mOptionsList = (ListView) findViewById(R.id.date_range_options_list);
        mAdapter = new LogRangeOptionsAdapter(this, R.layout.date_range_option_list_item, getResources().getStringArray(R.array.image_log_date_filter_options));
        mAdapter.setCheckedOption(mSelectedOption);
        mOptionsList.setAdapter(mAdapter);
    }
}

**适配器

public class LogRangeOptionsAdapter extends ArrayAdapter<String> {

    Context mAdapterContext;
    String[] mItems;
    String mSelectedOption;

    public LogRangeOptionsAdapter(Context context, int resource, String[] objects) {
        super(context, resource, objects);
        this.mAdapterContext = context;
        this.mItems = objects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) mAdapterContext.getSystemService(mAdapterContext.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.date_range_option_list_item, parent, false);
        }

        TextView mTitleText = (TextView) convertView.findViewById(R.id.date_range_option_text);
        mTitleText.setText(mItems[position]);
        final String titleText = mTitleText.getText().toString();

        CheckBox checkBox = (CheckBox) convertView.findViewById(R.id.date_range_option_checkbox);

        if (mSelectedOption.equalsIgnoreCase(mAdapterContext.getResources().getStringArray(R.array.image_log_date_filter_options)[0]) && position == 0) {
            checkBox.setVisibility(View.VISIBLE);
            checkBox.setChecked(true);
        }

        if (mSelectedOption.equalsIgnoreCase(mAdapterContext.getResources().getStringArray(R.array.image_log_date_filter_options)[1]) && position == 1) {
            checkBox.setVisibility(View.VISIBLE);
            checkBox.setChecked(true);
        }

        if (mSelectedOption.equalsIgnoreCase(mAdapterContext.getResources().getStringArray(R.array.image_log_date_filter_options)[2]) && position == 2) {
            checkBox.setVisibility(View.VISIBLE);
            checkBox.setChecked(true);
        }

        if (mSelectedOption.equalsIgnoreCase(mAdapterContext.getResources().getStringArray(R.array.image_log_date_filter_options)[3]) && position == 3) {
            checkBox.setVisibility(View.VISIBLE);
            checkBox.setChecked(true);
        }

        convertView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent returnOptionIntent = new Intent(mAdapterContext, ImageLogActivity.class);
                returnOptionIntent.putExtra(Utility.EXTRA_LOG_DATE_RANGE_OPTION, titleText);
                Activity activity = (Activity) mAdapterContext;
                activity.setResult(Utility.INTENT_IMAGE_LOG_OPTIONS_CODE, returnOptionIntent);
                activity.finish();
                activity.overridePendingTransition(R.anim.anim_slide_in_left, R.anim.anim_slide_out_left);
            }
        });

        return convertView;
    }

    public void setCheckedOption(String option){
        this.mSelectedOption = option;
    }
}