我使用以下代码将目录和一些文件复制到 sdcard。我复制的目录放在 assets 文件夹中。
public class CopyAssets extends Activity{
Button btn;
File sdCard = Environment.getExternalStorageDirectory();
private CameraBaseActivity mCamBase;
protected static String copyStatus;
CopyAssets(String path){
//copyFileOrDir(path);
copyStatus = "loading";
mCamBase = CameraBaseActivity.getInstance();
if(isSdPresent())
new MoveDir().execute(path);
}
private class MoveDir extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
copyStatus = "loaded";
copyFileOrDir("edu.cmu.pocketsphinx");
return (copyStatus);
}
@Override
protected void onPostExecute(String result) {
//TextView txt = (TextView) findViewById(R.id.output);
//txt.setText("Executed"); // txt.setText(result);
// might want to change "executed" for the returned string passed
// into onPostExecute() but that is upto you
mCamBase.initARParams();
}
@Override
protected void onPreExecute() {
}
@Override
protected void onProgressUpdate(Void... values) {
}
}
private void copyFileOrDir(String path) {
AssetManager assetManager = this.getAssets();
String assets[] = null;
try {
assets = assetManager.list(path);
if (assets.length == 0) {
copyFile(path);
} else {
File dir = new File(sdCard.getAbsolutePath() + "/" + path);
if (!dir.exists()) {
System.out.println("Created directory"
+ sdCard.getAbsolutePath());
boolean result = dir.mkdir();
System.out.println("Result of directory creation" + result);
}
for (int i = 0; i < assets.length; ++i) {
copyFileOrDir(path + "/" + assets[i]);
}
}
} catch (IOException ex) {
System.out.println("Exception in copyFileOrDir" + ex);
}
}
private void copyFile(String filename) {
AssetManager assetManager = this.getAssets();
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open(filename);
// String newFileName = "/data/data/" + this.getPackageName() + "/"
// + filename;//path for storing internally to data/data
String newFileName = sdCard.getAbsolutePath() + "/" + filename;
out = new FileOutputStream(newFileName);
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1) {
out.write(buffer, 0, read);
}
in.close();
in = null;
out.flush();
out.close();
out = null;
System.out.println("File created in path" + newFileName);
} catch (Exception e) {
System.out.println("Exception in copyFile" + e);
// System.out.println("Exception in copyFile"+e.print);
// Log.e("tag", e.printStackTrace());
}
}
public static boolean isSdPresent() {
return android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
}
}
例外是在doinbackground：
01-01 00:00:41.679: WARN/dalvikvm(1530): threadid=11: thread exiting with uncaught exception (group=0x40b3d1f8)
01-01 00:00:41.687: ERROR/CameraBaseActivity(1530): uncaughtException.
01-01 00:00:41.695: ERROR/CameraBaseActivity(1530): at android.os.AsyncTask$3.done(AsyncTask.java:278)
01-01 00:00:41.695: ERROR/CameraBaseActivity(1530): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
01-01 00:00:41.695: ERROR/CameraBaseActivity(1530): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
01-01 00:00:41.703: ERROR/CameraBaseActivity(1530): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
01-01 00:00:41.703: INFO/ActivityManager(292): Start proc com.test.android.imageplugin for service com.test.android.imageplugin/.ImagePluginServer: pid=1549 uid=6062 gids={1015, 1023}
01-01 00:00:41.710: ERROR/LL_Core(1530): [LifeLogSecurityUtility]lifelogdb permission error
01-01 00:00:41.710: ERROR/CameraBaseActivity(1530): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
01-01 00:00:41.710: ERROR/CameraBaseActivity(1530): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
01-01 00:00:41.710: ERROR/CameraBaseActivity(1530): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
01-01 00:00:41.710: ERROR/CameraBaseActivity(1530): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
01-01 00:00:41.710: ERROR/CameraBaseActivity(1530): at java.lang.Thread.run(Thread.java:856)
01-01 00:00:41.710: ERROR/CameraBaseActivity(1530): java.lang.RuntimeException: An error occured while executing doInBackground()
01-01 00:00:41.710: ERROR/CameraBaseActivity(1530): uncaughtException.
01-01 00:00:41.710: ERROR/CameraBaseActivity(1530): uncaughtException : other thread.
01-01 00:00:41.710: ERROR/CameraBaseActivity(1530): LLDB regist error. unregisted.
01-01 00:00:41.710: DEBUG/Camera(1530): Capture get() mIsExecuteRegistMenu=false
01-01 00:00:41.710: DEBUG/Camera(1530): onResumeImpl start
01-01 00:00:41.710: DEBUG/Camera(1530): execDisplayLayoutChangeNonSync start rotation:0
01-01 00:00:41.726: DEBUG/Camera(1530): onResumeImpl end
01-01 00:00:41.726: INFO/CameraBaseActivity(1530): onResume end
01-01 00:00:41.726: INFO/CameraBaseActivity(1530): onPostResume
01-01 00:00:41.890: INFO/CameraBaseActivity(1530): Camera.finish
我找不到它在 doinbackground 中意外崩溃的原因，因为我在这里发布的代码看不到任何错误。非常感谢任何帮助。