我正在进行一项 Activity ，其中有问答部分，其中一个问题在单选组中有 4 个选项。选择答案时，必须将答案的背景更改为绿色或红色(基于正确或错误)。
我有一个 Activity 调用一个监听 setOnCheckedListener 的 BaseAdapter 类。
PreviewAdapter.java
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import android.content.Context;
import android.graphics.Color;
import android.support.design.widget.Snackbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;
import technibits.com.pme.R;
import technibits.com.pme.activity.AsyncTaskCall;
import technibits.com.pme.activity.MasterDownload;
import technibits.com.pme.activity.PreviewActivity;
import technibits.com.pme.activity.ReviewFragment;
import technibits.com.pme.data.Quizdata;
import technibits.com.pme.data.ResultData;
public class PreviewAdapter extends BaseAdapter {
private Context context;
ReviewFragment activity;
Quizdata data;
String formID;
EditText dateText;
public ViewHolderA viewHolder;
int queNo;
int size;
String select;
public ResultData resData;
String urlMark = "xx.com/mark-for-review.php";
String urlRemove = "xx.com/mark-for-review-delete.php";
public RadioButton rButton = null;
HashMap<String, String> editTextvalue = new HashMap<String, String>();
MasterDownload httpRequest;
public String ansOption;
PreviewActivity previewActivity;
public PreviewAdapter(Context conte, Quizdata form, int qNO, int device, String strSelect ) {
super();
context = conte;
data = form;
queNo = qNO + 1;
size = device;
select = strSelect;
// previewActivity=pv;
}
@Override
public int getCount() {
return 3;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (size == 7) {
row = mInflater.inflate(R.layout.quiz_layout_seven, parent, false);
} else {
row = mInflater.inflate(R.layout.quiz_layout, parent, false);
}
if (row != null) {
viewHolder = new ViewHolderA();
viewHolder.reviewLayout = (LinearLayout) row.findViewById(R.id.review);
viewHolder.questionLayout = (LinearLayout) row.findViewById(R.id.question);
viewHolder.answerLayout = (LinearLayout) row.findViewById(R.id.answer);
viewHolder.questionView = (TextView) viewHolder.questionLayout.findViewById(R.id.questionView);
viewHolder.textQno = (TextView) row.findViewById(R.id.qNo);
viewHolder.radioGroup = (RadioGroup) row.findViewById(R.id.radioGroup);
viewHolder.rButton1 = (RadioButton) row.findViewById(R.id.RadioButton01);
viewHolder.rButton2 = (RadioButton) row.findViewById(R.id.RadioButton02);
viewHolder.rButton3 = (RadioButton) row.findViewById(R.id.RadioButton03);
viewHolder.rButton4 = (RadioButton) row.findViewById(R.id.RadioButton04);
viewHolder.reviewBox = (CheckBox) row.findViewById(R.id.rCheckBox);
viewHolder.showReview = (Button) row.findViewById(R.id.showReview);
// viewHolder.infoButton = (Button) row.findViewById(R.id.info);
} else {
viewHolder = (ViewHolderA) row.getTag();
}
if (position == 0) {
viewHolder.reviewLayout.setVisibility(View.VISIBLE);
viewHolder.questionLayout.setVisibility(View.GONE);
viewHolder.answerLayout.setVisibility(View.GONE);
int check = data.getISchecked();
if (check == 1) {
viewHolder.reviewBox.setChecked(true);
} else {
viewHolder.reviewBox.setChecked(false);
}
// String review = data.getStatus();
// if (review != null) {
// if (review.equals("A")) {
viewHolder.reviewBox.setEnabled(false);
// }
// }
if (select != null) {
viewHolder.reviewLayout.setVisibility(View.GONE);
}
} else if (position == 1) {
viewHolder.questionLayout.setVisibility(View.VISIBLE);
viewHolder.reviewLayout.setVisibility(View.GONE);
viewHolder.answerLayout.setVisibility(View.GONE);
viewHolder.questionView.setText(data.getQuestion());
viewHolder.textQno.setText("Q." + String.valueOf(queNo));
} else if (position == 2) {
viewHolder.answerLayout.setVisibility(View.VISIBLE);
viewHolder.questionLayout.setVisibility(View.GONE);
viewHolder.reviewLayout.setVisibility(View.GONE);
viewHolder.radioGroup.setEnabled(true);
viewHolder.rButton1.setText(data.getOptionA());
viewHolder.rButton2.setText(data.getOptionB());
viewHolder.rButton3.setText(data.getOptionC());
viewHolder.rButton4.setText(data.getOptionD());
final View uiview = row;
// viewHolder.rButton1.setBackgroundColor(Color.YELLOW);-------> Here color changes occur
if (select != null) {
viewHolder.radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
ansOption = "yes";
data.setIsAnswer(1);
int answer = Integer.valueOf(data.getAnswer());
int selected = -1;
if (checkedId == R.id.RadioButton01) {
selected = 1;
rButton = viewHolder.rButton1;
viewHolder.rButton1.setBackgroundColor(Color.YELLOW);
} else if (checkedId == R.id.RadioButton02) {
selected = 2;
rButton = viewHolder.rButton2;
} else if (checkedId == R.id.RadioButton03) {
selected = 3;
rButton = viewHolder.rButton3;
} else if (checkedId == R.id.RadioButton04) {
selected = 4;
rButton = viewHolder.rButton4;
}
if (rButton != null) {
if (answer + 1 == selected) {
rButton.setBackgroundColor(Color.GREEN);-------> Here color changes is not working
String dd = rButton.getText().toString();
rButton.setText("Correct answer");
} else {
rButton.setBackgroundColor(Color.RED);
data.setWrongAnswer(selected);
String dd = rButton.getText().toString();
System.out.println(dd);
}
}
if (answer == 0) {
viewHolder.rButton1.setBackgroundColor(Color.GREEN);
} else if (answer == 1) {
viewHolder.rButton2.setBackgroundColor(Color.GREEN);
} else if (answer == 2) {
viewHolder.rButton3.setBackgroundColor(Color.GREEN);
} else if (answer == 3) {
viewHolder.rButton4.setBackgroundColor(Color.GREEN);
}
for (int i = 0; i < viewHolder.radioGroup.getChildCount(); i++) {
viewHolder.radioGroup.getChildAt(i).setEnabled(false);
}
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("userid", "android@gmail.com"));
params.add(new BasicNameValuePair("qid", data.getQuestionID()));
AsyncTaskCall ask = new AsyncTaskCall(context, "review", params);
ask.execute(urlRemove);
}
});
} else {
System.out.println("data.getIsAnswer() " + data.getIsAnswer());
if (data.getIsAnswer() == 1) {
int wrong = data.getWrongAnswer();
int selected = -1;
if (wrong == 1) {
selected = 1;
rButton = viewHolder.rButton1;
setcolorGreen(viewHolder.rButton1);
} else if (wrong == 2) {
selected = 2;
rButton = viewHolder.rButton2;
} else if (wrong == 3) {
selected = 3;
rButton = viewHolder.rButton3;
} else if (wrong == 4) {
selected = 4;
rButton = viewHolder.rButton4;
}
int answer = Integer.valueOf(data.getAnswer());
if (rButton != null) {
if (answer + 1 == selected) {
rButton.setBackgroundColor(Color.GREEN);
} else {
rButton.setBackgroundColor(Color.RED);
}
}
if (answer == 0) {
viewHolder.rButton1.setBackgroundColor(Color.GREEN);
} else if (answer == 1) {
viewHolder.rButton2.setBackgroundColor(Color.GREEN);
} else if (answer == 2) {
viewHolder.rButton3.setBackgroundColor(Color.GREEN);
} else if (answer == 3) {
viewHolder.rButton4.setBackgroundColor(Color.GREEN);
}
for (int i = 0; i < viewHolder.radioGroup.getChildCount(); i++) {
viewHolder.radioGroup.getChildAt(i).setEnabled(false);
}
}
}
}
else
{
viewHolder.answerLayout.setVisibility(View.GONE);
viewHolder.questionLayout.setVisibility(View.GONE);
viewHolder.reviewLayout.setVisibility(View.GONE);
}
return row;
}
static class ViewHolderA {
LinearLayout reviewLayout;
LinearLayout questionLayout;
LinearLayout answerLayout;
Button showReview;
TextView questionView;
TextView textQno;
RadioGroup radioGroup;
public RadioButton rButton1;
public RadioButton rButton2;
public RadioButton rButton3;
public RadioButton rButton4;
CheckBox reviewBox;
}
void setcolorGreen(RadioButton rb){
rb.setBackgroundColor(Color.GREEN);
Toast.makeText(context,"Correct",Toast.LENGTH_SHORT).show();
}
void setcolorRed(RadioButton rb){
rb.setBackgroundColor(Color.RED);
Toast.makeText(context,"Wrong",Toast.LENGTH_SHORT).show();
}
}
The class calling this is
PreviewActivity.java
public class PreviewActivity extends Activity {
int device;
Button priv;
Button next;
boolean pCheck;
boolean nCheck;
Quizdata dataSource;
int count, position;
String select;
int iNext = 0;
ListView list;
ArrayList<Quizdata> data;
Context context;
TestAdapter adapter;
@SuppressWarnings("unchecked")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = this;
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int widthPixels = metrics.widthPixels;
int heightPixels = metrics.heightPixels;
float scaleFactor = metrics.density;
float widthDp = widthPixels / scaleFactor;
float heightDp = heightPixels / scaleFactor;
float smallestWidth = Math.min(widthDp, heightDp);
if (smallestWidth > 720) {
device = 10;
} else if (smallestWidth >= 600) {
device = 7; //Device is a 7" tablet
setContentView(R.layout.study_mode_seven);
} else {
setContentView(R.layout.study_mode);
}
// Bundle bundle = getIntent().getExtras();
list = (ListView) findViewById(R.id.listView1);
data = (ArrayList<Quizdata>) getIntent().getSerializableExtra("data");
count = getIntent().getExtras().getInt("count");
select = getIntent().getExtras().getString("review");
position = getIntent().getExtras().getInt("question_no");
// count = data.size();
if (data.size() > 0) {
dataSource = data.get(position);
adapter = new TestAdapter(context, dataSource, iNext, device, select);
// adapter.resData = resData;
list.setAdapter(adapter);
}
priv = (Button) findViewById(R.id.prev);
next = (Button) findViewById(R.id.next);
Button exp = (Button) findViewById(R.id.exp);
list = (ListView) findViewById(R.id.listView1);
priv.setEnabled(false);
if (select != null) {
priv.setVisibility(View.GONE);
exp.setVisibility(View.GONE);
next.setVisibility(View.GONE);
}
exp.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
AlertDialog.Builder alert = new AlertDialog.Builder(context);
alert.setTitle("Explanation");
alert.setMessage(dataSource.getDescription());
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// Do something with value!
}
});
alert.show();
}
});
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (next.getText().toString().equals("Next")) {
priv.setEnabled(true);
if (iNext == 0) {
iNext = 1;
pCheck = true;
}
if (nCheck) {
iNext++;
}
if (iNext < count) {
dataSource = data.get(iNext);
PreviewAdapter adapter = new PreviewAdapter(context, dataSource, iNext, device, select);
list.setAdapter(adapter);
priv.setEnabled(true);
iNext++;
pCheck = true;
nCheck = false;
}
if (iNext == count) {
// next.setEnabled(false);
next.setText("Finish");
// next.setBackgroundColor(Color.RED);
iNext = count - 1;
pCheck = false;
}
} else {
finish();
}
}
});
priv.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
if (iNext == count) {
iNext = count - 1;
}
if (pCheck) {
iNext--;
}
if (iNext > 0) {
iNext--;
dataSource = data.get(iNext);
PreviewAdapter adapter = new PreviewAdapter(context, dataSource, iNext, device, select);
// adapter.resData = resData;
list.setAdapter(adapter);
next.setEnabled(true);
if (next.getText().toString().equals("Finish")) {
next.setText("Next");
// next.setBackgroundDrawable(priv.getBackground());
}
nCheck = true;
pCheck = false;
}
if (iNext == 0) {
priv.setEnabled(false);
iNext = 0;
nCheck = false;
}
}
});
}
@Override
public void onBackPressed() {
super.onBackPressed();
sendMessage();
}
private void sendMessage() {
Log.d("sender", "Broadcasting message");
Intent intent = new Intent("custom-event-name");
// You can also include some extra data.
intent.putExtra("message", adapter.ansOption);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}
}
上面调用的Activity是
PreviewActivity.java
package technibits.com.pme.activity;
import java.util.ArrayList;
import technibits.com.pme.R;
import technibits.com.pme.adapter.PreviewAdapter;
import technibits.com.pme.adapter.TestAdapter;
import technibits.com.pme.data.Quizdata;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
public class PreviewActivity extends Activity {
int device;
Button priv;
Button next;
boolean pCheck;
boolean nCheck;
Quizdata dataSource;
int count, position;
String select;
int iNext = 0;
ListView list;
ArrayList<Quizdata> data;
Context context;
TestAdapter adapter;
@SuppressWarnings("unchecked")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = this;
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int widthPixels = metrics.widthPixels;
int heightPixels = metrics.heightPixels;
float scaleFactor = metrics.density;
float widthDp = widthPixels / scaleFactor;
float heightDp = heightPixels / scaleFactor;
float smallestWidth = Math.min(widthDp, heightDp);
if (smallestWidth > 720) {
device = 10;
} else if (smallestWidth >= 600) {
device = 7; //Device is a 7" tablet
setContentView(R.layout.study_mode_seven);
} else {
setContentView(R.layout.study_mode);
}
// Bundle bundle = getIntent().getExtras();
list = (ListView) findViewById(R.id.listView1);
data = (ArrayList<Quizdata>) getIntent().getSerializableExtra("data");
count = getIntent().getExtras().getInt("count");
select = getIntent().getExtras().getString("review");
position = getIntent().getExtras().getInt("question_no");
// count = data.size();
if (data.size() > 0) {
dataSource = data.get(position);
adapter = new TestAdapter(context, dataSource, iNext, device, select);
// adapter.resData = resData;
list.setAdapter(adapter);
}
priv = (Button) findViewById(R.id.prev);
next = (Button) findViewById(R.id.next);
Button exp = (Button) findViewById(R.id.exp);
list = (ListView) findViewById(R.id.listView1);
priv.setEnabled(false);
if (select != null) {
priv.setVisibility(View.GONE);
exp.setVisibility(View.GONE);
next.setVisibility(View.GONE);
}
exp.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
AlertDialog.Builder alert = new AlertDialog.Builder(context);
alert.setTitle("Explanation");
alert.setMessage(dataSource.getDescription());
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// Do something with value!
}
});
alert.show();
}
});
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (next.getText().toString().equals("Next")) {
priv.setEnabled(true);
if (iNext == 0) {
iNext = 1;
pCheck = true;
}
if (nCheck) {
iNext++;
}
if (iNext < count) {
dataSource = data.get(iNext);
PreviewAdapter adapter = new PreviewAdapter(context, dataSource, iNext, device, select);
list.setAdapter(adapter);
priv.setEnabled(true);
iNext++;
pCheck = true;
nCheck = false;
}
if (iNext == count) {
// next.setEnabled(false);
next.setText("Finish");
// next.setBackgroundColor(Color.RED);
iNext = count - 1;
pCheck = false;
}
} else {
finish();
}
}
});
priv.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
if (iNext == count) {
iNext = count - 1;
}
if (pCheck) {
iNext--;
}
if (iNext > 0) {
iNext--;
dataSource = data.get(iNext);
PreviewAdapter adapter = new PreviewAdapter(context, dataSource, iNext, device, select);
// adapter.resData = resData;
list.setAdapter(adapter);
next.setEnabled(true);
if (next.getText().toString().equals("Finish")) {
next.setText("Next");
// next.setBackgroundDrawable(priv.getBackground());
}
nCheck = true;
pCheck = false;
}
if (iNext == 0) {
priv.setEnabled(false);
iNext = 0;
nCheck = false;
}
}
});
}
@Override
public void onBackPressed() {
super.onBackPressed();
sendMessage();
}
private void sendMessage() {
Log.d("sender", "Broadcasting message");
Intent intent = new Intent("custom-event-name");
// You can also include some extra data.
intent.putExtra("message", adapter.ansOption);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}
}
当我调试适配器类时，它完全按照应用程序的逻辑进行。但仅颜色没有改变。
可能出现什么问题？
最佳答案
View (行)在监听器内没有范围。所以我将该 View 声明为最终 View (uiview)，该 View 在 onChecklistener 内具有范围。之后就可以很酷了。但我仍然不知道以前的方法不起作用的原因。
关于java - radiogroup.setOnCheckedListener 未按预期工作。(更改单选按钮的颜色)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30774026/