Creates an empty temporary file in the given directory using the given prefix and suffix as part of the file name. - Android Hardware

Android examples for Hardware:Directory

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Description

Creates an empty temporary file in the given directory using the given prefix and suffix as part of the file name.

Demo Code


import android.content.ContentResolver;
import android.content.Context;
import android.net.Uri;
import android.provider.CalendarContract;
import com.android.calendar.CalendarEventModel;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Random;
import java.util.TimeZone;

public class Main{
    private static final Random tempFileRandom = new Random();
    /**//from   ww w .  ja v  a  2s. c  o  m
     * Creates an empty temporary file in the given directory using the given
     * prefix and suffix as part of the file name. If {@code suffix} is null, {@code .tmp} is used.
     *
     * <p>Note that this method does <i>not</i> call {@link #deleteOnExit}, but see the
     * documentation for that method before you call it manually.
     *
     * @param prefix
     *            the prefix to the temp file name.
     * @param suffix
     *            the suffix to the temp file name.
     * @param directory
     *            the location to which the temp file is to be written, or
     *            {@code null} for the default location for temporary files,
     *            which is taken from the "java.io.tmpdir" system property. It
     *            may be necessary to set this property to an existing, writable
     *            directory for this method to work properly.
     * @return the temporary file.
     * @throws IllegalArgumentException
     *             if the length of {@code prefix} is less than 3.
     * @throws IOException
     *             if an error occurs when writing the file.
     */
    public static File createTempFile(String prefix, String suffix,
            File directory) throws IOException {
        // Force a prefix null check first
        if (prefix.length() < 3) {
            throw new IllegalArgumentException(
                    "prefix must be at least 3 characters");
        }
        if (suffix == null) {
            suffix = ".tmp";
        }
        File tmpDirFile = directory;
        if (tmpDirFile == null) {
            String tmpDir = System.getProperty("java.io.tmpdir", ".");
            tmpDirFile = new File(tmpDir);
        }
        File result;
        do {
            result = new File(tmpDirFile, prefix
                    + tempFileRandom.nextInt(Integer.MAX_VALUE) + suffix);
        } while (!result.createNewFile());
        return result;
    }
}

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