Android 我的光标未显示下一个数据行？
我正在构建一个Android应用程序。我使用的是Sqlite数据库、四个单选按钮和一个文本视图。当我单击每个单选按钮时，它应该显示数据库中的下一组数据。现在，它只显示数据库中的第一个数据行。如何更改代码以使其显示适当的行Android 我的光标未显示下一个数据行？,android,sqlite,Android,Sqlite,我正在构建一个Android应用程序。我使用的是Sqlite数据库、四个单选按钮和一个文本视图。当我单击每个单选按钮时，它应该显示数据库中的下一组数据。现在，它只显示数据库中的第一个数据行。如何更改代码以使其显示适当的行 db.open(); try{ final Cursor c = db.getAllQue(); if(c != null) { if (c.moveToFirst()) {
db.open();
try{
final Cursor c = db.getAllQue();
if(c != null)
{
if (c.moveToFirst())
{
int size = c.getCount();
for(int i=0;i<=size;i++)
quen = (TextView) findViewById(R.id.textView1);
anss1 = (RadioButton) findViewById(R.id.radio0);
anss2 = (RadioButton) findViewById(R.id.radio1);
anss3 = (RadioButton) findViewById(R.id.radio2);
anss4 = (RadioButton) findViewById(R.id.radio3);
rgp1 = (RadioGroup) findViewById(R.id.radioGroup1);
String ques = c.getString(0);
String anes1 = c.getString(1);
String anes2 = c.getString(2);
String anes3 = c.getString(3);
String anes4 = c.getString(4);
String anes = c.getString(5);
rgp1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radioButton = (RadioButton) findViewById(checkedId);
Toast.makeText(SqlliteActivity.this, "" + radioButton.getText(), 2000).show();
c.moveToNext();
}
});
quen.setText(ques);
anss1.setText(anes1);
anss2.setText(anes2);
anss3.setText(anes3);
anss4.setText(anes4);
}
}
}catch(Exception e){
System.out.println(e);
}
db.close();
}
db.open();
try{
final Cursor c = db.getAllQue();
if(c != null)
{
if (c.moveToFirst())
{
int size = c.getCount();
for(int i=0;i<=size;i++)
quen = (TextView) findViewById(R.id.textView1);
anss1 = (RadioButton) findViewById(R.id.radio0);
anss2 = (RadioButton) findViewById(R.id.radio1);
anss3 = (RadioButton) findViewById(R.id.radio2);
anss4 = (RadioButton) findViewById(R.id.radio3);
rgp1 = (RadioGroup) findViewById(R.id.radioGroup1);
String ques = c.getString(0);
String anes1 = c.getString(1);
String anes2 = c.getString(2);
String anes3 = c.getString(3);
String anes4 = c.getString(4);
String anes = c.getString(5);
rgp1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radioButton = (RadioButton) findViewById(checkedId);
Toast.makeText(SqlliteActivity.this, "" + radioButton.getText(), 2000).show();
c.moveToNext();
}
});
quen.setText(ques);
anss1.setText(anes1);
anss2.setText(anes2);
anss3.setText(anes3);
anss4.setText(anes4);
}
}
}catch(Exception e){
System.out.println(e);
}
db.close();
}
db.open（）；
试一试{
最终游标c=db.getAllQue（）；
如果（c！=null）
{
if（c.moveToFirst（））
{
int size=c.getCount（）；
for（int i=0；i你的函数不是只迭代这一行吗？quen=（TextView）findViewById（R.id.TextView 1）；
db.open();
try{
final Cursor c = db.getAllQue();
if(c != null)
{
if (c.moveToFirst())
{
int size = c.getCount();
for(int i=0;i<=size;i++)
quen = (TextView) findViewById(R.id.textView1);
anss1 = (RadioButton) findViewById(R.id.radio0);
anss2 = (RadioButton) findViewById(R.id.radio1);
anss3 = (RadioButton) findViewById(R.id.radio2);
anss4 = (RadioButton) findViewById(R.id.radio3);
rgp1 = (RadioGroup) findViewById(R.id.radioGroup1);
String ques = c.getString(0);
String anes1 = c.getString(1);
String anes2 = c.getString(2);
String anes3 = c.getString(3);
String anes4 = c.getString(4);
String anes = c.getString(5);
rgp1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radioButton = (RadioButton) findViewById(checkedId);
Toast.makeText(SqlliteActivity.this, "" + radioButton.getText(), 2000).show();
c.moveToNext();
}
});
quen.setText(ques);
anss1.setText(anes1);
anss2.setText(anes2);
anss3.setText(anes3);
anss4.setText(anes4);
}
}
}catch(Exception e){
System.out.println(e);
}
db.close();
}
此外，您正在查找游标迭代中的每个UI元素以及for
db.open();
try{
final Cursor c = db.getAllQue();
if(c != null)
{
if (c.moveToFirst())
{
int size = c.getCount();
for(int i=0;i<=size;i++)
quen = (TextView) findViewById(R.id.textView1);
anss1 = (RadioButton) findViewById(R.id.radio0);
anss2 = (RadioButton) findViewById(R.id.radio1);
anss3 = (RadioButton) findViewById(R.id.radio2);
anss4 = (RadioButton) findViewById(R.id.radio3);
rgp1 = (RadioGroup) findViewById(R.id.radioGroup1);
String ques = c.getString(0);
String anes1 = c.getString(1);
String anes2 = c.getString(2);
String anes3 = c.getString(3);
String anes4 = c.getString(4);
String anes = c.getString(5);
rgp1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radioButton = (RadioButton) findViewById(checkedId);
Toast.makeText(SqlliteActivity.this, "" + radioButton.getText(), 2000).show();
c.moveToNext();
}
});
quen.setText(ques);
anss1.setText(anes1);
anss2.setText(anes2);
anss3.setText(anes3);
anss4.setText(anes4);
}
}
}catch(Exception e){
System.out.println(e);
}
db.close();
}
但即使将大括号添加到for：
db.open();
try{
final Cursor c = db.getAllQue();
if(c != null)
{
if (c.moveToFirst())
{
int size = c.getCount();
for(int i=0;i<=size;i++)
quen = (TextView) findViewById(R.id.textView1);
anss1 = (RadioButton) findViewById(R.id.radio0);
anss2 = (RadioButton) findViewById(R.id.radio1);
anss3 = (RadioButton) findViewById(R.id.radio2);
anss4 = (RadioButton) findViewById(R.id.radio3);
rgp1 = (RadioGroup) findViewById(R.id.radioGroup1);
String ques = c.getString(0);
String anes1 = c.getString(1);
String anes2 = c.getString(2);
String anes3 = c.getString(3);
String anes4 = c.getString(4);
String anes = c.getString(5);
rgp1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radioButton = (RadioButton) findViewById(checkedId);
Toast.makeText(SqlliteActivity.this, "" + radioButton.getText(), 2000).show();
c.moveToNext();
}
});
quen.setText(ques);
anss1.setText(anes1);
anss2.setText(anes2);
anss3.setText(anes3);
anss4.setText(anes4);
}
}
}catch(Exception e){
System.out.println(e);
}
db.close();
}
db.open();
try{
final Cursor c = db.getAllQue();
if(c != null)
{
if (c.moveToFirst())
{
int size = c.getCount();
for(int i=0;i<=size;i++) {
quen = (TextView) findViewById(R.id.textView1);
anss1 = (RadioButton) findViewById(R.id.radio0);
anss2 = (RadioButton) findViewById(R.id.radio1);
anss3 = (RadioButton) findViewById(R.id.radio2);
anss4 = (RadioButton) findViewById(R.id.radio3);
rgp1 = (RadioGroup) findViewById(R.id.radioGroup1);
String ques = c.getString(0);
String anes1 = c.getString(1);
String anes2 = c.getString(2);
String anes3 = c.getString(3);
String anes4 = c.getString(4);
String anes = c.getString(5);
rgp1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radioButton = (RadioButton) findViewById(checkedId);
Toast.makeText(SqlliteActivity.this, "" + radioButton.getText(), 2000).show();
c.moveToNext();
}
}
db.open（）；
试一试{
最终游标c=db.getAllQue（）；
如果（c！=null）
{
if（c.moveToFirst（））
{
int size=c.getCount（）；
对于（inti=0；i在循环之外启动对象元素
db.open();
try{
final Cursor c = db.getAllQue();
if(c != null)
{
if (c.moveToFirst())
{
int size = c.getCount();
for(int i=0;i<=size;i++)
quen = (TextView) findViewById(R.id.textView1);
anss1 = (RadioButton) findViewById(R.id.radio0);
anss2 = (RadioButton) findViewById(R.id.radio1);
anss3 = (RadioButton) findViewById(R.id.radio2);
anss4 = (RadioButton) findViewById(R.id.radio3);
rgp1 = (RadioGroup) findViewById(R.id.radioGroup1);
String ques = c.getString(0);
String anes1 = c.getString(1);
String anes2 = c.getString(2);
String anes3 = c.getString(3);
String anes4 = c.getString(4);
String anes = c.getString(5);
rgp1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radioButton = (RadioButton) findViewById(checkedId);
Toast.makeText(SqlliteActivity.this, "" + radioButton.getText(), 2000).show();
c.moveToNext();
}
});
quen.setText(ques);
anss1.setText(anes1);
anss2.setText(anes2);
anss3.setText(anes3);
anss4.setText(anes4);
}
}
}catch(Exception e){
System.out.println(e);
}
db.close();
}
quen = (TextView) findViewById(R.id.textView1);
anss1 = (RadioButton) findViewById(R.id.radio0);
anss2 = (RadioButton) findViewById(R.id.radio1);
anss3 = (RadioButton) findViewById(R.id.radio2);
anss4 = (RadioButton) findViewById(R.id.radio3);
rgp1 = (RadioGroup) findViewById(R.id.radioGroup1);
使用while循环获取下一条记录
db.open();
try{
final Cursor c = db.getAllQue();
if(c != null)
{
if (c.moveToFirst())
{
int size = c.getCount();
for(int i=0;i<=size;i++)
quen = (TextView) findViewById(R.id.textView1);
anss1 = (RadioButton) findViewById(R.id.radio0);
anss2 = (RadioButton) findViewById(R.id.radio1);
anss3 = (RadioButton) findViewById(R.id.radio2);
anss4 = (RadioButton) findViewById(R.id.radio3);
rgp1 = (RadioGroup) findViewById(R.id.radioGroup1);
String ques = c.getString(0);
String anes1 = c.getString(1);
String anes2 = c.getString(2);
String anes3 = c.getString(3);
String anes4 = c.getString(4);
String anes = c.getString(5);
rgp1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radioButton = (RadioButton) findViewById(checkedId);
Toast.makeText(SqlliteActivity.this, "" + radioButton.getText(), 2000).show();
c.moveToNext();
}
});
quen.setText(ques);
anss1.setText(anes1);
anss2.setText(anes2);
anss3.setText(anes3);
anss4.setText(anes4);
}
}
}catch(Exception e){
System.out.println(e);
}
db.close();
}
db.open();
try{
final Cursor c = db.getAllQue();
if(c != null)
{
c.moveToFirst();
do{
//All your operations
//everytime you will get next record.
}while(moveToNext());
}
}catch(Exception e){
e.printstack();
}
您的实现逻辑是错误的。