【发布时间】：2016-02-27 13:13:06
【问题描述】：
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。看看下面的sn-ps代码：
列出活动：-
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>
【问题讨论】：