输出SQLite database 到sd卡-优快云博客

本文介绍了一个用于将Android设备上的数据库文件导出到外部存储的任务类实现。该类使用了AsyncTask来处理后台的文件复制操作，并提供了成功或失败的反馈。

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    public static class ExportDatabaseFileTask extends AsyncTask<String, Void, Boolean> {
private Context ctx;


        public ExportDatabaseFileTask(Context ctx) {
super();
this.ctx=ctx;
}

                protected Boolean doInBackground(final String... args) {

File dbFile =
new File(Environment.getDataDirectory() + "/data/[com.your.pkg]/databases/[pkg]");

File exportDir = new File(Environment.getExternalStorageDirectory(), "");
if (!exportDir.exists()) {
exportDir.mkdirs();
}
File file = new File(exportDir, dbFile.getName());

try {
file.createNewFile();
this.copyFile(dbFile, file);
return true;
} catch (IOException e) {
Log.e("birthdroid", e.getMessage(), e);
return false;
}
}

               protected void onPostExecute(final Boolean success) {
if (success) {
Toast.makeText(ctx, "Export successful!", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(ctx, "Export failed", Toast.LENGTH_SHORT).show();
}
}

void copyFile(File src, File dst) throws IOException {
FileChannel inChannel = new FileInputStream(src).getChannel();
FileChannel outChannel = new FileOutputStream(dst).getChannel();
try {
inChannel.transferTo(0, inChannel.size(), outChannel);
} finally {
if (inChannel != null)
inChannel.close();
if (outChannel != null)
outChannel.close();
}
}

}