所以我有一个带有listview的应用程序。单击列表视图项时，它将打开一个新活动。我在这个新活动中放置了一个复选框，当它被选中时，它应该在前一个屏幕上的listview项旁边放置一个复选标记。我正在考虑这个错误，因为我正在尝试从第二个活动中设置复选框，该活动具有与列表视图不同的内容视图。我希望我解释得那么好。
使用复选框代码
继承我的RouteDetails.javapublic class RouteDetails extends AppCompatActivity {
ImageView routeImage;
String routeName;
CheckBox routeCheckBox;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_route_details);
//back button for route details view
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
///////checkbox///////////////////////////////////////////
routeCheckBox = (CheckBox) findViewById(R.id.routeCheckBox);
final ImageView checkImageView = (ImageView) findViewById(R.id.checkImageView);
routeCheckBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View view)
{
if (routeCheckBox.isChecked())
{
checkImageView.setImageResource(R.drawable.birdsboroicon);
}
}
});
/////////////////////////////////////////////
//sets actionbar title
routeName = getIntent().getExtras().getString("routeName");
getSupportActionBar().setTitle(routeName);
//TextView for route details
final TextView routeDetailsView = (TextView) findViewById(R.id.routeDetailsView);
routeDetailsView.setText(getIntent().getExtras().getCharSequence("route"));
//ImageView for route details
routeImage = (ImageView) findViewById(R.id.routeImage);
final int mImageResource = getIntent().getIntExtra("imageResourceId", 0);
routeImage.setImageResource(mImageResource);
并且继承了包含我试图根据复选框状态设置的imageview的custom_row.xml。
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="51dp"
android:id="@+id/routeText"
android:layout_weight="1"
android:textSize="18sp"
android:gravity="center_vertical"
android:textColor="@android:color/black"
android:typeface="normal"
/>
<ImageView
android:layout_width="35dp"
android:layout_height="35dp"
android:id="@+id/checkImageView" />
所以我希望在按下后退按钮后，复选标记位于listview项旁边。
如果是相关的话，我会包含其他代码
继承我的RouteDetails.xml，其中包含复选框
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_route_details"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.zach.listview.RouteDetails">
<CheckBox
android:text="Route Climbed"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/routeCheckBox"
android:gravity="center" />
<TextView
android:text="TextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/routeDetailsView"
android:textSize="18sp"
android:textAlignment="center"
android:textColor="@android:color/black"
android:layout_below="@id/routeCheckBox"/>
<ImageView
android:layout_below="@id/routeDetailsView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/routeImage"
android:scaleType="fitCenter"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:adjustViewBounds="true" />
</RelativeLayout>
</ScrollView>
My Custom adapter.java，用于创建每个listview行
class CustomAdapter extends ArrayAdapter<CharSequence>{
public CustomAdapter(Context context, CharSequence[] routes) {
super(context, R.layout.custom_row ,routes);
}
@NonNull
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater routeInflater = LayoutInflater.from(getContext());
View customView = convertView;
if(customView == null){customView = routeInflater.inflate(R.layout.custom_row, parent, false);}
CharSequence singleRoute = getItem(position);
TextView routeText = (TextView) customView.findViewById(R.id.routeText);
routeText.setText(singleRoute);
return customView;
}
my mainavtivity.java，这是填充列表视图的地方
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Action Bar customization
final android.support.v7.app.ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayOptions(android.support.v7.app.ActionBar.DISPLAY_SHOW_CUSTOM);
actionBar.setCustomView(R.layout.actionbar);
setContentView(R.layout.activity_main);
///// fill listview numbers I want to add
final String[] routeListviewNumbers = getResources().getStringArray(R.array.routeNumbers);
//fill list view with xml array of routes
final CharSequence[] routeListViewItems = getResources().getTextArray(R.array.routeList);
//fills route detail text view with xml array info
final CharSequence[] routeDetail= getResources().getTextArray(R.array.routeDetail);
//fills route detail image view with xml array of images
final TypedArray image = getResources().obtainTypedArray(R.array.routeImages);
//image.recycle();
//custom adapter for list view
ListAdapter routeAdapter = new CustomAdapter(this, routeListViewItems);
final ListView routeListView = (ListView) findViewById(R.id.routeListView);
routeListView.setAdapter(routeAdapter);
routeListView.setOnItemClickListener(
new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
CharSequence route = routeListViewItems[position];
int imageId = (int) image.getResourceId(position, -1);
if (route.equals(routeListViewItems[position]))
{
Intent intent = new Intent(view.getContext(), RouteDetails.class);
intent.putExtra("route", routeDetail[position]);
intent.putExtra("imageResourceId", imageId);
intent.putExtra("routeName", routeListViewItems[position]);
startActivity(intent);
}
}
}
);
}
}
和我的activitymain.xml是listview
<?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:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="0dp"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:paddingTop="0dp"
tools:context="com.example.zach.listview.MainActivity">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/routeListView"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
编辑：所以我把它添加到了我的RouteDetails.java
routeCheckBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View view)
{
if (routeCheckBox.isChecked())
{
//checkImageView.setImageResource(R.drawable.checkmark);
Intent check = new Intent(RouteDetails.this,CustomAdapter.class);
check.putExtra("checkImageResource", R.drawable.checkmark);
startActivity(check);
}
}
});
这是我的customAdapter.java
////////trying to set checkmark/////
ImageView checkImageView = (ImageView) customView.findViewById(R.id.checkImageView);
checkImageView.setImageResource(((Activity) getContext()).getIntent().getIntExtra("checkImageResource",0));
////////////////////////////////////////
但这也不起作用。它说致命异常无法找到明确的活动类。我这样做是因为CustomAdapter不是一个活动，但是customadapter链接到我的custom_row，其中包含我要添加复选框的imageview。我该怎么做？我不确定还有什么可以尝试
编辑：如果有人有任何建议，我仍然没有找到解决方案！