我在按钮上设置了onclick事件（提交）。如果未选中某个广播组的单选按钮，则我尝试Toast消息并进行焦点/列表查看，滚动第一个未选中的广播组，并在其旁边带有错误图像或文本（请选择答案），并在所有未选中的广播组旁边显示错误。我可以实现Toast消息，但是在未经检查的广播组上无法实现焦点和错误。
**CustomAdapter**
public class CustomAdapter extends BaseAdapter {
Context context;
String[] questionsList;
LayoutInflater inflter;
public ArrayList<String> selectedAnswers;
public CustomAdapter(Context applicationContext, String[] questionsList) {
this.context = context;
this.questionsList = questionsList;
resetAnswers();
inflter = (LayoutInflater.from(applicationContext));
}
public void resetAnswers(){
selectedAnswers = new ArrayList<>();
for (int i = 0; i < questionsList.length; i++) {
selectedAnswers.add("3");
}
}
@Override
public int getCount() {
return questionsList.length;
}
@Override
public Object getItem(int i) {
return questionsList[i];
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public int getViewTypeCount() {
return questionsList.length;
}
@Override
public int getItemViewType(int i) {
return i;
}
@Override
public View getView(final int i, View convertView, ViewGroup viewGroup) {
View view = convertView;
if (convertView == null) {
if (inflter != null) {
view = inflter.inflate(R.layout.list_items, null);
}
}
TextView question = (TextView) view.findViewById(R.id.question);
question.setText(questionsList[i]);
final RadioGroup rg = (RadioGroup)view.findViewById(R.id.radio_group);
final RadioButton rb_yes = (RadioButton) rg.findViewById(R.id.yes);
final RadioButton rb_no = (RadioButton) rg.findViewById(R.id.no);
if(selectedAnswers.get(i).equals("1")){
rg.check(R.id.yes);
}else if(selectedAnswers.get(i).equals("2")){
rg.check(R.id.no);
}else{
rb_yes.setBackgroundColor(Color.GRAY);
rb_no.setBackgroundColor(Color.GRAY);
}
rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton rb_yes = (RadioButton) group.findViewById(R.id.yes);
RadioButton rb_no = (RadioButton) group.findViewById(R.id.no);
switch (checkedId){
case R.id.yes:
rb_yes.setBackgroundColor(Color.GREEN);
rb_no.setBackgroundColor(Color.BLACK);
selectedAnswers.set(i, "1");
break;
case R.id.no:
rb_yes.setBackgroundColor(Color.BLACK);
rb_no.setBackgroundColor(Color.rgb(255,165,0));
selectedAnswers.set(i, "2");
break;
}
if (checkedId !=-1){
Log.d("USB", "oniew "+checkedId);
rg.clearCheck();
}
else
{
Log.d("USB", "towie "+checkedId);
}
}
});
if (rb_yes.isChecked()||rb_no.isChecked()){
Log.d("USB", "checked");
}
else
{
Log.d("USB", "null ");
}
Log.d("USB", "I value "+i);
return view;
}
public List<String> getSelectedAnswers(){
return selectedAnswers;
}
**Main Activity**
public class MainActivity extends AppCompatActivity {
private ListView simpleListView;
private CustomAdapter customAdapter;
private String[] questions;
private Button submit, clear;
private RadioGroup radioGroup;
FileOutputStream fstream;
private boolean forceClear;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayUseLogoEnabled(true);
questions = getResources().getStringArray(R.array.questions);
simpleListView = (ListView) findViewById(R.id.simpleListView);
View Listview = getLayoutInflater().inflate(R.layout.list_items,null);
RadioButton rb_yes = Listview.findViewById(R.id.yes);
RadioButton rb_no = Listview.findViewById(R.id.no);
final RadioGroup radioGroup= Listview.findViewById(R.id.radio_group);
View footerView = getLayoutInflater().inflate(R.layout.footer,null);
clear= (Button) footerView.findViewById(R.id.clear);
submit = (Button) footerView.findViewById(R.id.submit1);
simpleListView.addFooterView(footerView);
View headerView = getLayoutInflater().inflate(R.layout.header, null);
simpleListView.addHeaderView(headerView);
customAdapter = new CustomAdapter(getApplicationContext(),questions);
simpleListView.setAdapter(customAdapter);
clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
customAdapter.resetAnswers();
customAdapter.notifyDataSetChanged();
}
});
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {LayoutInflater inflater=getLayoutInflater();
View customToastroot=inflater.inflate(R.layout.mycustom_toast, null);
String message = "";
boolean found_unanswered = false;
if(customAdapter != null){
for(int i = 0 ;i<customAdapter.getSelectedAnswers().size() ; i++){ if(customAdapter.getSelectedAnswers().get(i).equals("3")){
String p = customAdapter.getSelectedAnswers().get(i);
Log.d("USB", "ID check main "+customAdapter.getSelectedAnswers().get(i));
radioGroup.requestFocus();
radioGroup.requestFocusFromTouch();
Context context=getApplicationContext();
Toast customtoast= new Toast(context);
customtoast.setView(customToastroot);
customtoast.setGravity(Gravity.CENTER_HORIZONTAL | Gravity.CENTER_VERTICAL,0, 0);
customtoast.setDuration(Toast.LENGTH_LONG);
customtoast.show();
found_unanswered = true;
break;
}
message = message + "\n" + (i + 1) + " " + customAdapter.getSelectedAnswers().get(i);
}
}
if(!found_unanswered){
try {
fstream = openFileOutput("user_answer", Context.MODE_PRIVATE);
fstream.write(message.getBytes());
fstream.close();
Toast.makeText(getApplicationContext() ,message , Toast.LENGTH_LONG).show();
Intent inent = new Intent(view.getContext(), DetailsActivity.class);
startActivity(inent);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
}
@SuppressLint("RestrictedApi")
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
if(menu instanceof MenuBuilder){
MenuBuilder m = (MenuBuilder) menu;
m.setOptionalIconsVisible(true);
}
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (id == R.id.about) {
Intent inent = new Intent(MainActivity.this, devicedetailsActivity.class);
startActivity(inent);
return true;
}
if (id == R.id.admin) {
Intent inent = new Intent(MainActivity.this, adminactivity.class);
startActivity(inent);
return true;
}
if (id == R.id.SerialPort) {
Intent inent = new Intent(MainActivity.this, DeviceListActivity.class);
startActivity(inent);
return true;
}
if (id == R.id.customservice) {
Intent inent = new Intent(MainActivity.this, testactivity_main.class);
startActivity(inent);
return true;
}
if (id == R.id.exit) {
ActivityCompat.finishAffinity(MainActivity.this);
return true;
}
return super.onOptionsItemSelected(item);
}
Thanks
答案 0 :(得分：0)
尝试以下操作：
1）MainActivity_.class：-----------------
public class MainActivity_ extends AppCompatActivity {
private ListView lv;
private CustomAdapter customAdapter;
private String[] questions;
private Button submit;
private Button clear;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout8);
questions = new String[10];
for(int i = 0 ; i<10 ; i++){
questions[i] = "Q " + i;
}
lv = (ListView) findViewById(R.id.lv);
customAdapter = new CustomAdapter(getApplicationContext() , questions);
lv.setAdapter(customAdapter);
submit = (Button) findViewById(R.id.submit);
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
boolean found_unanswered = false;
int index_first_unanswered = 0;
List<Integer> backgroundColor = new ArrayList<Integer>(); // new
if(customAdapter != null){
for(int i = 0 ; i<customAdapter.getSelectedAnswers().size() ; i++){
if(customAdapter.getSelectedAnswers().get(i).equals("3")){
if(!found_unanswered) { // new
found_unanswered = true;
index_first_unanswered = i; // new
}
backgroundColor.add(Color.RED); // new
}else{ // new
backgroundColor.add(Color.WHITE);
}
}
}
if(!found_unanswered) {
Toast.makeText(getApplicationContext(), "All Answered", Toast.LENGTH_LONG).show();
customAdapter.setBackgroundColor(backgroundColor); // new
//Go to other activity
}else{ // new
Toast.makeText(getApplicationContext(), "Found Unanswered", Toast.LENGTH_LONG).show();
if(customAdapter != null && lv != null){
customAdapter.setBackgroundColor(backgroundColor);
lv.smoothScrollToPosition(index_first_unanswered);
}
}
}
});
clear = (Button) findViewById(R.id.clear);
clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (customAdapter != null) {
customAdapter.clearSelectedAnswers();
}
}
});
}
}
2）CustomAdapter.class：----------------
public class CustomAdapter extends BaseAdapter {
Context context;
String[] questionsList;
LayoutInflater inflter;
private List<String> selectedAnswers;
private List<Integer> backgroundColor; // new
public CustomAdapter(Context context, String[] questionsList) {
this.context = context;
this.questionsList = questionsList;
selectedAnswers = new ArrayList<String>();
backgroundColor = new ArrayList<Integer>(); // new
for (int i = 0; i < questionsList.length; i++) {
selectedAnswers.add("3");
backgroundColor.add(Color.WHITE); // new
}
inflter = (LayoutInflater.from(context));
}
@Override
public int getCount() {
return questionsList.length;
}
@Override
public Object getItem(int i) {
return questionsList[i];
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public int getViewTypeCount() {
return questionsList.length;
}
@Override
public int getItemViewType(int i) {
return i;
}
@Override
public View getView(final int i, View convertView, ViewGroup viewGroup) {
View view = convertView;
if (convertView == null) {
if (inflter != null) {
view = inflter.inflate(R.layout.list_items, null);
}
}
TextView question = (TextView) view.findViewById(R.id.question);
question.setText(questionsList[i]);
question.setBackgroundColor(backgroundColor.get(i)); // new
// initialize/re-restore UI Radio Button State
final RadioGroup rg = (RadioGroup) view.findViewById(R.id.radio_group);
RadioButton rb_yes = (RadioButton) rg.findViewById(R.id.yes);
RadioButton rb_no = (RadioButton) rg.findViewById(R.id.no);
if(selectedAnswers.get(i).equals("1")){
rg.check(R.id.yes);
rb_yes.setBackgroundColor(Color.GREEN);
rb_no.setBackgroundColor(Color.GRAY);
}else if(selectedAnswers.get(i).equals("2")){
rg.check(R.id.no);
rb_yes.setBackgroundColor(Color.GRAY);
rb_no.setBackgroundColor(Color.BLACK);
}else {
// no answer.
rg.clearCheck(); // new
rb_yes.setBackgroundColor(Color.GRAY);
rb_no.setBackgroundColor(Color.GRAY);
}
rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton rb_yes = (RadioButton) group.findViewById(R.id.yes);
RadioButton rb_no = (RadioButton) group.findViewById(R.id.no);
//Toast.makeText(context , (checkedId == R.id.yes)?"yes":"no" , Toast.LENGTH_LONG).show();
switch (checkedId){
case R.id.yes:
rb_yes.setBackgroundColor(Color.GREEN);
rb_no.setBackgroundColor(Color.GRAY);
selectedAnswers.set(i, "1");
break;
case R.id.no:
rb_yes.setBackgroundColor(Color.GRAY);
rb_no.setBackgroundColor(Color.BLACK);
selectedAnswers.set(i, "2");
break;
default: // new
rb_yes.setBackgroundColor(Color.GRAY);
rb_no.setBackgroundColor(Color.GRAY);
selectedAnswers.set(i, "3");
break;
}
}
});
return view;
}
public List<String> getSelectedAnswers(){
return selectedAnswers;
}
public void clearSelectedAnswers(){
selectedAnswers = new ArrayList<String>();
backgroundColor = new ArrayList<Integer>();
for (int i = 0; i < questionsList.length; i++) {
selectedAnswers.add("3");
backgroundColor.add(Color.WHITE); // new
}
this.notifyDataSetChanged();
}
public void setBackgroundColor(List<Integer> backgroundColor_){ // new
this.backgroundColor = backgroundColor_;
this.notifyDataSetChanged();
}
}
3）layout_8.xml：---------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="100"
android:orientation="vertical">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="90"
android:id="@+id/lv">
</ListView>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_weight="10"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:orientation="horizontal">
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Submit"
android:layout_toStartOf="@id/v"
android:textAllCaps="false"
android:id="@+id/submit"/>
<View
android:layout_width="1dp"
android:layout_height="0dp"
android:id="@+id/v"
android:layout_centerInParent="true">
</View>
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Clear"
android:layout_toEndOf="@id/v"
android:textAllCaps="false"
android:id="@+id/clear"/>
</RelativeLayout>
</LinearLayout>
4）list_items.xml：--------
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical">
<!-- TextView for displaying question-->
<TextView
android:id="@+id/question"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textColor="#000"
android:textSize="30dp"
android:text="Which is your most favorite?"
/>
<FrameLayout 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"
tools:context=".MainActivity"
android:id="@+id/main">
<RadioGroup
android:id="@+id/radio_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:orientation="horizontal">
<RadioButton
android:id="@+id/yes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="20dp"
android:button="@null"
android:paddingHorizontal="30dp"
android:paddingVertical="5dp"
android:text="YES"
android:textSize="50dp" />
<RadioButton
android:id="@+id/no"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:button="@null"
android:paddingHorizontal="30dp"
android:paddingVertical="5dp"
android:text="NO"
android:textSize="50dp" />
</RadioGroup>
</FrameLayout>
</LinearLayout>