我有这种方法从List中压缩文件,另一种方法使用它来通过意图发送邮件。
我的问题是,当我发送两到三次应用程序崩溃并向我显示时。
E/StrictMode: A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.
java.lang.Throwable: Explicit termination method 'close' not called
at dalvik.system.CloseGuard.open(CloseGuard.java:184)
at java.io.FileOutputStream.<init>(FileOutputStream.java:89)
at java.io.FileOutputStream.<init>(FileOutputStream.java:72)
at com.waffles.vatsandbats.VisaDatai.zip(VisaDatai.java:1172)
at com.waffles.vatsandbats.VisaDatai.sendZippedMail(VisaDatai.java:207)
at com.waffles.vatsandbats.VisaDatai.getFiles(VisaDatai.java:298)
at com.waffles.vatsandbats.VisaDatai$7$1.run(VisaDatai.java:1823)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:211)
at android.app.ActivityThread.main(ActivityThread.java:5373)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)
主要问题(我认为)在此消息中
at com.waffles.vatsandbats.VisaDatai.zip(VisaDatai.java:1172)
指的是这个
in = new FileInputStream(files.get(i)
.getCanonicalFile());
以下是创建zip并具有错误代码
的方法public static File zip(List<File> files, String filename) {
File zipfile = new File(filename);
// Create a buffer for reading the files
FileInputStream in=null;
byte[] buf = new byte[1024];
try {
// create the ZIP file
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
zipfile));
// compress the files
for (int i = 0; i < files.size(); i++) {
in = new FileInputStream(files.get(i)
.getCanonicalFile());
// add ZIP entry to output stream
out.putNextEntry(new ZipEntry(files.get(i).getName()));
// transfer bytes from the file to the ZIP file
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
// complete the entry
out.closeEntry();
in.close();
}
// complete the ZIP file
out.close();
return zipfile;
} catch (IOException ex) {
ex.printStackTrace();
}
return null;
}
我压缩的文件列表是几个带有图像和文本的PrintedPdfDocuments(这个类有它的缺点,但我现在懒得改变它)
我只是找不到问题。也许我需要改变拉链的方法。有什么建议吗?
答案 0 :(得分:0)
您应该在finally块中关闭流,以确保即使发生异常也能正确关闭它们。
在创建getCanonicalFile()
时,使用FileInputStream
也会创建新文件。你可能想要:
in = new FileInputStream(files.get(i));
答案 1 :(得分:0)
我解决了。我关闭了for循环中的FileInputStream。因此,每次循环并打开流时,我也关闭它。
我最后添加了一个自己的try catch for close block,但是当我拿走for循环中的close部分时它就崩溃了。
这是工作代码
public File zip(List<File> files, String filename) {
File zipfile = new File(filename);
FileInputStream in=null;
ZipOutputStream out=null;
// Create a buffer for reading the files
byte[] buf = new byte[1024];
try {
// create the ZIP file
out = new ZipOutputStream(new FileOutputStream(
zipfile));
// compress the files
for (int i = 0; i < files.size(); i++) {
in = new FileInputStream(files.get(i));
// add ZIP entry to output stream
out.putNextEntry(new ZipEntry(files.get(i).getName()));
// transfer bytes from the file to the ZIP file
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
try {
in.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
} catch (IOException ex) {
ex.printStackTrace();
}finally {
try {
try {
in.close();
} catch (IOException e1) {
e1.printStackTrace();
}
out.closeEntry();
out.close();
}catch (Exception ex) {
ex.printStackTrace();
}
}
return zipfile;
}