I am having a little problem with Relative Layouts. I’m doing a project in which I have to read some values from a .CSV file and display them dynamically in a Relative Layout. I’ll put a couple of code snippets and images and then explain my problem.
First Code snippet:
package ekalavya.pratnala.quiz;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.StringTokenizer;
import android.app.Activity;
import android.os.Bundle;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.ScrollView;
public class QuizActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Beginning of variable declarations
File quizSpecs = new File("mnt/sdcard/teacher.csv"); // Read the file
BufferedReader csvReader = null;
String line = ""; // Storing each line in a string
StringTokenizer currentLine = null;
int noOfQuestions = 0; // Number of questions in the quiz
int time = 0; // Duration of the quiz
int[][] quizData; // Storing the quiz specifications in an integer array
int i = 0, j = 0; // Loop variables
int[][] questionImages = {
{ R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d,
R.drawable.e, R.drawable.f, R.drawable.g, R.drawable.h,
R.drawable.i, R.drawable.j },
{ R.drawable.a_checked, R.drawable.b_checked,
R.drawable.c_checked, R.drawable.d_checked,
R.drawable.e_checked, R.drawable.f_checked,
R.drawable.g_checked, R.drawable.h_checked,
R.drawable.i_checked, R.drawable.j_checked },
{ R.drawable.zero, R.drawable.one, R.drawable.two,
R.drawable.three, R.drawable.four, R.drawable.five,
R.drawable.six, R.drawable.seven, R.drawable.eight,
R.drawable.nine },
{ R.drawable.zero_checked, R.drawable.one_checked,
R.drawable.two_checked, R.drawable.three_checked,
R.drawable.four_checked, R.drawable.five_checked,
R.drawable.six_checked, R.drawable.seven_checked,
R.drawable.eight_checked, R.drawable.nine_checked } };
// End of variable declarations
try {
csvReader = new BufferedReader(new FileReader(quizSpecs));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
line = csvReader.readLine();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
currentLine = new StringTokenizer(line, ",");
noOfQuestions = Integer.parseInt(currentLine.nextToken());
time = Integer.parseInt(currentLine.nextToken());
while (currentLine.hasMoreTokens())
;
quizData = new int[noOfQuestions][6];
for (i = 0; i < noOfQuestions; i++) {
try {
line = csvReader.readLine();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
currentLine = new StringTokenizer(line, ",");
for (j = 0; j < 6; j++) {
quizData[i][j] = Integer.parseInt(currentLine.nextToken());
}
}
try {
csvReader.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ScrollView s1 = new ScrollView(this);
RelativeLayout r1 = new RelativeLayout(this);
for (i = 0; i < 2; i++) {
switch (quizData[i][1]) {
case 1:
case 2:
for (j = 0; j < quizData[i][2]; j++) {
ImageView option = new ImageView(this);
option.setImageResource(questionImages[0][j]);
option.setId(j + (10 * (i + 1)));
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.RIGHT_OF, j - 1
+ (10 * (i + 1)));
option.setLayoutParams(params);
r1.addView(option, params);
}
break;
}
}
s1.addView(r1, new LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT));
this.setContentView(s1);
}
}
Image 1: https://www.dropbox.com/s/vzpilyotvgtipbb/pic2.png
Second Code snippet:
package ekalavya.pratnala.quiz;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.StringTokenizer;
import android.app.Activity;
import android.os.Bundle;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.ScrollView;
public class QuizActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Beginning of variable declarations
File quizSpecs = new File("mnt/sdcard/teacher.csv"); // Read the file
BufferedReader csvReader = null;
String line = ""; // Storing each line in a string
StringTokenizer currentLine = null;
int noOfQuestions = 0; // Number of questions in the quiz
int time = 0; // Duration of the quiz
int[][] quizData; // Storing the quiz specifications in an integer array
int i = 0, j = 0; // Loop variables
int[][] questionImages = {
{ R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d,
R.drawable.e, R.drawable.f, R.drawable.g, R.drawable.h,
R.drawable.i, R.drawable.j },
{ R.drawable.a_checked, R.drawable.b_checked,
R.drawable.c_checked, R.drawable.d_checked,
R.drawable.e_checked, R.drawable.f_checked,
R.drawable.g_checked, R.drawable.h_checked,
R.drawable.i_checked, R.drawable.j_checked },
{ R.drawable.zero, R.drawable.one, R.drawable.two,
R.drawable.three, R.drawable.four, R.drawable.five,
R.drawable.six, R.drawable.seven, R.drawable.eight,
R.drawable.nine },
{ R.drawable.zero_checked, R.drawable.one_checked,
R.drawable.two_checked, R.drawable.three_checked,
R.drawable.four_checked, R.drawable.five_checked,
R.drawable.six_checked, R.drawable.seven_checked,
R.drawable.eight_checked, R.drawable.nine_checked } };
// End of variable declarations
try {
csvReader = new BufferedReader(new FileReader(quizSpecs));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
line = csvReader.readLine();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
currentLine = new StringTokenizer(line, ",");
noOfQuestions = Integer.parseInt(currentLine.nextToken());
time = Integer.parseInt(currentLine.nextToken());
while (currentLine.hasMoreTokens())
;
quizData = new int[noOfQuestions][6];
for (i = 0; i < noOfQuestions; i++) {
try {
line = csvReader.readLine();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
currentLine = new StringTokenizer(line, ",");
for (j = 0; j < 6; j++) {
quizData[i][j] = Integer.parseInt(currentLine.nextToken());
}
}
try {
csvReader.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ScrollView s1 = new ScrollView(this);
RelativeLayout r1 = new RelativeLayout(this);
for (i = 0; i < 1; i++) {
switch (quizData[i][3]) {
case 1:
case 2:
for (j = 0; j < quizData[i][2]; j++) {
ImageView option = new ImageView(this);
option.setImageResource(questionImages[0][j]);
option.setId(j + (10 * (i + 1)));
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.RIGHT_OF, j - 1
+ (10 * (i + 1)));
option.setLayoutParams(params);
r1.addView(option, params);
}
break;
}
}
s1.addView(r1, new LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT));
this.setContentView(s1);
}
}
Image 2: https://www.dropbox.com/s/itazcpshjzbza4t/pic1.png
When the loop in the switch case with variable ‘i’ is run only once, the second output comes. And if I run it twice, the first output comes. But that’s not what I want. I want the first output row to show below the second output row. I know something is wrong in the code but I don’t know how to rectify it. Please help me! Also, I want to know how to place those elements anywhere on the screen.
P.S. I haven’t been allowed to upload images because my reputation is less than 10 (I’m a newbie here). So, I put them on Dropbox and have put the links here. Sorry for the inconvenience.
I have solved this: I specified only the
RIGHT_OFproperty before and hence it didn’t know where to place it vertically and so put it at the top. Specifying theBELOWproperty as well fixed the issue.