这是ODK收集的代码！我想更改所选列表视图项目或形式的背景颜色。我试图寻找有关如何动态更改最新列表项目的背景颜色的解决方案，没有任何人可以帮助我使用解决方案
这是formchooser活动
**
/*
* Copyright (C) 2009 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package org.odk.collect.android.activities;
import android.app.AlertDialog;
import android.content.ContentUris;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.TextView;
import org.odk.collect.android.R;
import org.odk.collect.android.application.Collect;
import org.odk.collect.android.dao.FormsDao;
import org.odk.collect.android.listeners.DiskSyncListener;
import org.odk.collect.android.provider.FormsProviderAPI.FormsColumns;
import org.odk.collect.android.tasks.DiskSyncTask;
import org.odk.collect.android.utilities.ApplicationConstants;
import org.odk.collect.android.utilities.VersionHidingCursorAdapter;
import timber.log.Timber;
/**
* Responsible for displaying all the valid forms in the forms directory. Stores the path to
* selected form for use by {@link MainMenuActivity}.
*
* @author Yaw Anokwa (yanokwa@gmail.com)
* @author Carl Hartung (carlhartung@gmail.com)
*/
public class FormChooserList extends FormListActivity implements DiskSyncListener, AdapterView.OnItemClickListener {
private static final String FORM_CHOOSER_LIST_SORTING_ORDER = "formChooserListSortingOrder";
private static final boolean EXIT = true;
private static final String syncMsgKey = "syncmsgkey";
private DiskSyncTask diskSyncTask;
@Override
public void onCreate(Bundle savedInstanceState) {
// must be at the beginning of any activity that can be called from an external intent
try {
Collect.createODKDirs();
} catch (RuntimeException e) {
createErrorDialog(e.getMessage(), EXIT);
return;
}
setContentView(R.layout.chooser_list_layout);
super.onCreate(savedInstanceState);
setTitle(getString(R.string.enter_data));
setupAdapter();
if (savedInstanceState != null && savedInstanceState.containsKey(syncMsgKey)) {
TextView tv = (TextView) findViewById(R.id.status_text);
tv.setText((savedInstanceState.getString(syncMsgKey)).trim());
}
// DiskSyncTask checks the disk for any forms not already in the content provider
// that is, put here by dragging and dropping onto the SDCard
diskSyncTask = (DiskSyncTask) getLastCustomNonConfigurationInstance();
if (diskSyncTask == null) {
Timber.i("Starting new disk sync task");
diskSyncTask = new DiskSyncTask();
diskSyncTask.setDiskSyncListener(this);
diskSyncTask.execute((Void[]) null);
}
sortingOptions = new String[]{
getString(R.string.sort_by_name_asc), getString(R.string.sort_by_name_desc),
getString(R.string.sort_by_date_asc), getString(R.string.sort_by_date_desc),
};
}
@Override
public Object onRetainCustomNonConfigurationInstance() {
// pass the thread on restart
return diskSyncTask;
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
TextView tv = (TextView) findViewById(R.id.status_text);
outState.putString(syncMsgKey, tv.getText().toString().trim());
}
/**
* Stores the path of selected form and finishes.
*/
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// get uri to form
long idFormsTable = listView.getAdapter().getItemId(position);
Uri formUri = ContentUris.withAppendedId(FormsColumns.CONTENT_URI, idFormsTable);
Collect.getInstance().getActivityLogger().logAction(this, "onListItemClick",
formUri.toString());
String action = getIntent().getAction();
if (Intent.ACTION_PICK.equals(action)) {
// caller is waiting on a picked form
setResult(RESULT_OK, new Intent().setData(formUri));
} else {
// caller wants to view/edit a form, so launch formentryactivity
Intent intent = new Intent(Intent.ACTION_EDIT, formUri);
intent.putExtra(ApplicationConstants.BundleKeys.FORM_MODE, ApplicationConstants.FormModes.EDIT_SAVED);
startActivity(intent);
}
finish();
}
@Override
protected void onResume() {
diskSyncTask.setDiskSyncListener(this);
super.onResume();
if (diskSyncTask.getStatus() == AsyncTask.Status.FINISHED) {
syncComplete(diskSyncTask.getStatusMessage());
}
}
@Override
protected void onPause() {
diskSyncTask.setDiskSyncListener(null);
super.onPause();
}
@Override
protected void onStart() {
super.onStart();
Collect.getInstance().getActivityLogger().logOnStart(this);
}
@Override
protected void onStop() {
Collect.getInstance().getActivityLogger().logOnStop(this);
super.onStop();
}
/**
* Called by DiskSyncTask when the task is finished
*/
@Override
public void syncComplete(String result) {
Timber.i("Disk sync task complete");
TextView tv = (TextView) findViewById(R.id.status_text);
tv.setText(result.trim());
}
private void setupAdapter() {
String[] data = new String[]{
FormsColumns.DISPLAY_NAME, FormsColumns.DISPLAY_SUBTEXT, FormsColumns.JR_VERSION
};
int[] view = new int[]{
R.id.text1, R.id.text2, R.id.text3
};
listAdapter =
new VersionHidingCursorAdapter(FormsColumns.JR_VERSION, this, R.layout.two_item, getCursor(), data, view);
listView.setAdapter(listAdapter);
}
@Override
protected String getSortingOrderKey() {
return FORM_CHOOSER_LIST_SORTING_ORDER;
}
@Override
protected void updateAdapter() {
listAdapter.changeCursor(getCursor());
}
private Cursor getCursor() {
return new FormsDao().getFormsCursor(getFilterText(), getSortingOrder());
}
/**
* Creates a dialog with the given message. Will exit the activity when the user preses "ok" if
* shouldExit is set to true.
*/
private void createErrorDialog(String errorMsg, final boolean shouldExit) {
Collect.getInstance().getActivityLogger().logAction(this, "createErrorDialog", "show");
AlertDialog alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setIcon(android.R.drawable.ic_dialog_info);
alertDialog.setMessage(errorMsg);
DialogInterface.OnClickListener errorListener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int i) {
switch (i) {
case DialogInterface.BUTTON_POSITIVE:
Collect.getInstance().getActivityLogger().logAction(this,
"createErrorDialog",
shouldExit ? "exitApplication" : "OK");
if (shouldExit) {
finish();
}
break;
}
}
};
alertDialog.setCancelable(false);
alertDialog.setButton(getString(R.string.ok), errorListener);
alertDialog.show();
**
}
}
这是布局
**
<?xml version="1.0" encoding="utf-8"?><!-- Copyright (C) 2009 University of Washington
Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy of
the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations under
the License.
-->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- Toolbar -->
<include layout="@layout/toolbar"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/toolbar"
android:orientation="vertical">
<TextView
android:id="@+id/status_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#DDDDDD"
android:paddingBottom="4dip"
android:paddingEnd="8dip"
android:paddingLeft="8dip"
android:paddingRight="8dip"
android:paddingStart="8dip"
android:paddingTop="4dip"
android:text="@string/form_scan_starting"
android:textSize="14sp"/>
<ListView
android:id="@id/android:list"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
<TextView
android:id="@android:id/empty"
style="@style/emptyViewStyle"
android:text="@string/no_items_display_forms"/>
</LinearLayout>
<include
layout="@layout/toolbar_action_bar_shadow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/toolbar"/>
</RelativeLayout>
**
在oniTemClick（）方法中尝试调用View.setBackgroundResource（color）