This example shows how to create a CSV file on removable storage in Android. CSV files are a convenient storage format for data to be easily viewed in programs like Excel or OpenOffice.
In this example, my goal is to create a CSV file having the following text:
|
---------------------------------------------
| FirstParam |
SecondParam |
ThirdParam |
| 0.31 |
5.2 |
7 |
| 0.31 |
5.2 |
7.1 |
| 0.31 |
5.2 |
7.2 |
|
Add this code to open a new file called "mydata.csv" on the SD card:
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import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import android.os.Environment;
---------------------------------------------
FileWriter writer;
File root = Environment.getExternalStorageDirectory();
File gpxfile = new File(root, "mydata.csv");
|
Use this routine to write the csv headers:
private void writeCsvHeader(String h1, String h2, String h3) throws IOException {
String line = String.format("%s,%s,%s\n", h1,h2,h3);
writer.write(line);
} |
Use this routine to write CSV values to the file:
private void writeCsvData(float d, float e, float f) throws IOException {
String line = String.format("%f,%f,%f\n", d, e, f);
writer.write(line);
} |
Write the header and data lines like this:
|
try {
writer = new FileWriter(gpxfile);
writeCsvHeader("FirstParam","SecondParam","ThirdParam");
writeCsvData(0.31f,5.2f,7.0f);
writeCsvData(0.31f,5.2f,7.1f);
writeCsvData(0.31f,5.2f,7.2f);
} catch (IOException e) {
e.printStackTrace();
}
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Quick note: adding "f" to the end of the constant number above tells Java you explicitly want to pass the value as a float, instead of a double.
Don't forget to close the file:
writer.flush();
writer.close();
|
| FirstParam |
SecondParam |
ThirdParam |
| 0.31 |
5.2 |
7 |
|
| 0.31 |
5.2 |
7.1 |
|
| 0.31 |
5.2 |
7.2 |
|
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