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我正在使用以下代码将我的数据库的副本导出到我的SD卡。没有将数据库写入SD卡的代码
public class AgUtility extends AgActivity{
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.utility);
try {
backupDatabase(getBaseContext());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void backupDatabase(Context context) throws IOException {
// Open your local db as the input stream
String inFileName = "data/data/com.agmanagement.todaysstudent/databases/todaysstudent.db";
Toast.makeText(context, "FileName Is "+ inFileName, Toast.LENGTH_LONG).show();
Log.i("The File In Is ", inFileName);
File dbFile = new File(inFileName);
FileInputStream fis = new FileInputStream(dbFile);
File outputDirectory = new File(
Environment.getExternalStorageDirectory() + "/student/");
outputDirectory.mkdir();
Log.d("MAKE DIR", dbFile.mkdir() + "");
String backupFileName = "/TodaysStudentTest.db3";
String outFileName = outputDirectory + backupFileName;
Toast.makeText(context, "Database backup names is " + outFileName , Toast.LENGTH_LONG)
.show();
// Open the empty db as the output stream
OutputStream output = new FileOutputStream(outFileName);
// transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = fis.read(buffer)) > 0) {
output.write(buffer, 0, length);
}
// Close the streams
output.flush();
output.close();
fis.close();
Toast.makeText(context, "Database backup complete", Toast.LENGTH_LONG)
.show();
}
}
代码似乎正常工作，因为我没有得到任何错误，先敬酒显示正确的数据库名称，第二敬酒显示输出目录应该mnt中/ SD卡/学生和第三节目最终的目标应该是mnt/sdcard/student/TodaysStudentTest.db3
之后Toast淡入淡出，没有任何东西，最后的Toast从不出现。
在我的清单我有
我在三星平板，而不是在模拟器上测试此，我也对DroidX同样的结果，没有错误运行它，但没有创建文件夹。
关于我在做什么错的任何想法？ TIA
我使用的权限是
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.premission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.SET_DEBUG_APP" />
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.READ_CALENDAR"/>
<uses-permission android:name="android.permission.WRITE_CALENDAR"/>
我在模拟器中运行时得到相同的结果 - 与DDMS看 - logcat的演出MAKE DIR失败。
我测试过的状态，这
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
mExternalStorageAvailable = mExternalStorageWriteable = true;
Toast.makeText(getBaseContext(), "We Can Read And Write To The SDCARD", Toast.LENGTH_LONG).show();
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
Toast.makeText(getBaseContext(), "We Can Read The SDCARD", Toast.LENGTH_LONG).show();
} else {
// Something else is wrong. It may be one of many other states, but all we need
// to know is we can neither read nor write
mExternalStorageAvailable = mExternalStorageWriteable = false;
Toast.makeText(getBaseContext(), "We Can't read or write", Toast.LENGTH_LONG).show();
}
它表明我应该能够读取和写入，所以有什么问题怎么我写。我将此添加到文本
boolean success = false;
if(!outputDirectory.exists()){
Toast.makeText(getBaseContext(), "Folder Doesn't Exist ", Toast.LENGTH_LONG)
.show();
success = outputDirectory.mkdirs();
}
if (!success){
Toast.makeText(getBaseContext(), "Folder Not Created ", Toast.LENGTH_LONG)
.show();
}
else{
Toast.makeText(getBaseContext(), "Folder Created ", Toast.LENGTH_LONG)
.show();
}
结果是文件夹不存在，然后mkdirs（）失败。
只是出于好奇，你为什么要在你的logcat语句中创建一个目录，你不使用？ 'Log.d（“MAKE DIR”，dbFile.mkdir（）+“”）;' – Sam 2012-04-17 16:16:53
我改变了回到上面的行，我试图看看mkdir是否工作 – Hank 2012-04-17 17:16:42
我找到了一个简化的方法，看到我的更新。 – Sam 2012-04-17 21:19:06