Android手机开发——向SD卡上的文件追加内容

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import android.os.Environment;

public class SDFileUtils {
	private String SDPATH;

	private String fileName = "logFile.txt";
	private static SDFileUtils logFile = null;
	
	// SDCRAD文件访问的构造函数
	public SDFileUtils() {
		SDPATH = Environment.getExternalStorageDirectory() + "/";
	}

	public static SDFileUtils get()
	{
		if(logFile == null)
		{
		logFile = new SDFileUtils();	
		}
		
		return logFile;
	}
	
	// 在SDCRAD上创建文件
	private File createFile() throws IOException {
		File file = new File(SDPATH + fileName);
		file.createNewFile();
		return file;
	}


	// 向文件中写入数据
	public void writeToSDFile(String msg) {
		File file = null;
		OutputStream outputStream = null;
		try {
			file = this.createFile();
			
			outputStream = new FileOutputStream(file, true);
	
			outputStream.write(msg.getBytes());

			outputStream.flush();
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			try {
				outputStream.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

}

 

注意：需要权限 android.permission.WRITE_EXTERNAL_STORAGE