我正在尝试将一些数据写入内部存储。问题是我读它的时候。它什么都不读。 Logcat说它写了一些东西。但是当我读到它时,Log cat说它是空的。这是我的文件管理器:
public class FileManager {
File dir;
File driveFile;
BufferedWriter writer=null;
BufferedReader reader=null;
public FileManager(Context context,String name){
dir = new File(context.getFilesDir(),"drives");
dir.mkdirs();
driveFile = new File(dir,name+".txt");
Log.d("FileManager",driveFile.getAbsolutePath());
}
public void open() throws IOException{
writer = new BufferedWriter(new FileWriter(driveFile));
reader = new BufferedReader(new FileReader(driveFile));
}
public void close() throws IOException{
writer.close();
reader.close();
}
public boolean writeTrackPoints(Drive drive){
TrackPoint [] trackPoints=drive.getTrackPoints();
Log.d("FileManager", "writing....");
for(int i=0;i<trackPoints.length;i++){
try {
String line = trackPoints[i].getParsingString()+"\r\n";
writer.write(line);
writer.flush();
Log.d("FileManager", "Writing" + line);
} catch (IOException e) {
return false;
}
}
return true;
}
public boolean readTrackPoints(Drive drive){
String line=null;
Log.d("FileManager", "reading....");
try {
while((line = reader.readLine())!=null){
Log.d("FileManager", "Reading: "+line);
drive.addTrackPoint(new TrackPoint(line));
}
} catch (IOException e) {
Log.d("FileManager", e.getMessage());
return false;
}
return true;
}
}
我无法检查文件是否为空,因为我的设备没有root。我认识到在阅读时cyclus并没有进入。我一次打开两个流不是问题吗?
答案 0 :(得分:1)
我已经解决了。方法是打开/关闭的问题。也许不可能在一瞬间打开两个流。这是编辑过的FileManager:
public class FileManager {
File dir;
File driveFile;
BufferedWriter writer=null;
BufferedReader reader=null;
public FileManager(Context context,String name){
dir = new File(context.getFilesDir(),"drives");
dir.mkdirs();
driveFile = new File(dir,name+".txt");
Log.d("FileManager",driveFile.getAbsolutePath());
}
public void writeTrackPoints(Drive drive) throws IOException{
writer = new BufferedWriter(new FileWriter(driveFile));
TrackPoint [] trackPoints=drive.getTrackPoints();
for(int i=0;i<trackPoints.length;i++){
String line = trackPoints[i].getParsingString()+"\r\n";
writer.write(line);
writer.flush();
}
writer.close();
}
public void readTrackPoints(Drive drive) throws IOException{
reader = new BufferedReader(new FileReader(driveFile));
String line=null;
while((line = reader.readLine())!=null){
drive.addTrackPoint(new TrackPoint(line));
}
reader.close();
}
}