我有下面的代码来选择打开对话框的目录，其中包含选择自定义目录路径的选项
DirectoryChooserDialog directoryChooserDialog =
new DirectoryChooserDialog(MainActivity.this,
new DirectoryChooserDialog.ChosenDirectoryListener()
{
@Override
public void onChosenDir(String chosenDir)
{
m_chosenDir = chosenDir;
Toast.makeText(
MainActivity.this, "Chosen directory: " +
chosenDir, Toast.LENGTH_LONG).show();
}
});
// Toggle new folder button enabling
directoryChooserDialog.setNewFolderEnabled(m_newFolderEnabled);
// Load directory chooser dialog for initial 'm_chosenDir' directory.
// The registered callback will be called upon final directory selection.
directoryChooserDialog.chooseDirectory(m_chosenDir);
m_newFolderEnabled = ! m_newFolderEnabled;
及以下是将文件保存在外部存储器中的代码
public void takePicture(View view) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
file = Uri.fromFile(getOutputMediaFile());
intent.putExtra(MediaStore.EXTRA_OUTPUT, file);
startActivityForResult(intent, 100);
}
private static File getOutputMediaFile() {
File mediaStorageDir = new File(m_chosenDir);
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d("CameraDemo", "failed to create directory");
return null;
}
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
return new File(mediaStorageDir.getPath() + File.separator +
"IMG_" + timeStamp + ".jpg");
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 100) {
if (resultCode == RESULT_OK) {
imageView.setImageURI(file);
}
}
但它突出了
中的错误File mediaStorageDir = new File(m_chosenDir);
以下是图像文件， Error Image
我该如何解决这个问题？在哪一步我做错了...请好好建议。
提前致谢。
答案 0 :(得分：0)
请尝试以下代码：
1）MainActivity.class：----------------
public class MainActivity extends AppCompatActivity {
private Button b;
private ImageView iv;
private final int PICTURE_ACTIVITY_CODE = 1;
private File captured_image_file;
private boolean flag = false;
private boolean flag_1 = false;
private String file_name = "myphoto";
private String file_extension = "png";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iv = (ImageView) findViewById(R.id.iv);
b = (Button) findViewById(R.id.b);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
createDirectoryChooserDialog();
}
});
}
private void createDirectoryChooserDialog() {
File mPath = new File(Environment.getExternalStorageDirectory() + "//DIR//");
FileDialog fileDialog = new FileDialog(this, mPath, "." + "png");
fileDialog.addDirectoryListener(new FileDialog.DirectorySelectedListener() {
public void directorySelected(File directory) {
Log.e(getClass().getName(), "*********selected dir " + directory.toString());
if (!directory.toString().isEmpty()) {
if (directory.exists()) {
captured_image_file = new File(directory.getAbsolutePath() + "/" + file_name + "." + file_extension);
flag = true;
} else {
flag = false; // directory doesn't exits.
}
}
if (flag) {
if (!captured_image_file.exists()) { // file doesn't exist
Log.e("File doesn't exists", "Creating File");
try {
flag_1 = captured_image_file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
flag_1 = false;
}
} else {
flag_1 = true; // file will be over-written
}
if (flag_1) {
Log.e("Creation", "Succeeded");
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
Uri outputFileUri = Uri.fromFile(captured_image_file);
intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(intent, PICTURE_ACTIVITY_CODE);
}
}
}
});
fileDialog.setSelectDirectoryOption(true);
fileDialog.showDialog();
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICTURE_ACTIVITY_CODE) {
if (resultCode == RESULT_OK) {
Uri inputFileUri = Uri.fromFile(captured_image_file);
Bitmap image = BitmapFactory.decodeFile(inputFileUri.getPath());
iv.setImageBitmap(image);
} else {
// handle partially created file
}
}
}
}
2）FileDialog.class：------------
public class FileDialog {
private static final String PARENT_DIR = "..";
private final String TAG = getClass().getName();
private String[] fileList;
private File currentPath;
public interface FileSelectedListener {
void fileSelected(File file);
}
public interface DirectorySelectedListener {
void directorySelected(File directory);
}
private ListenerList<FileSelectedListener> fileListenerList = new ListenerList<FileSelectedListener>();
private ListenerList<DirectorySelectedListener> dirListenerList = new ListenerList<DirectorySelectedListener>();
private final Activity activity;
private boolean selectDirectoryOption;
private String fileEndsWith;
/**
* @param activity
* @param initialPath
*/
public FileDialog(Activity activity, File initialPath) {
this(activity, initialPath, null);
}
public FileDialog(Activity activity, File initialPath, String fileEndsWith) {
this.activity = activity;
setFileEndsWith(fileEndsWith);
if (!initialPath.exists()) initialPath = Environment.getExternalStorageDirectory();
loadFileList(initialPath);
}
/**
* @return file dialog
*/
public Dialog createFileDialog() {
Dialog dialog = null;
AlertDialog.Builder builder = new AlertDialog.Builder(activity , android.R.style.Theme_Translucent_NoTitleBar);
//dialog.setContentView(R.layout.loading_screen);
builder.setTitle(currentPath.getPath());
if (selectDirectoryOption) {
builder.setPositiveButton("Select directory", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Log.e("pathname", currentPath.getPath());
fireDirectorySelectedEvent(currentPath);
}
});
}
builder.setItems(fileList, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
String fileChosen = fileList[which];
File chosenFile = getChosenFile(fileChosen);
if (chosenFile.isDirectory()) {
loadFileList(chosenFile);
dialog.cancel();
dialog.dismiss();
showDialog();
} else fireFileSelectedEvent(chosenFile);
}
});
dialog = builder.show();
return dialog;
}
public void addFileListener(FileSelectedListener listener) {
fileListenerList.add(listener);
}
public void removeFileListener(FileSelectedListener listener) {
fileListenerList.remove(listener);
}
public void setSelectDirectoryOption(boolean selectDirectoryOption) {
this.selectDirectoryOption = selectDirectoryOption;
}
public void addDirectoryListener(DirectorySelectedListener listener) {
dirListenerList.add(listener);
}
public void removeDirectoryListener(DirectorySelectedListener listener) {
dirListenerList.remove(listener);
}
/**
* Show file dialog
*/
public void showDialog() {
createFileDialog().show();
}
private void fireFileSelectedEvent(final File file) {
fileListenerList.fireEvent(new ListenerList.FireHandler<FileSelectedListener>() {
public void fireEvent(FileSelectedListener listener) {
listener.fileSelected(file);
}
});
}
private void fireDirectorySelectedEvent(final File directory) {
dirListenerList.fireEvent(new ListenerList.FireHandler<DirectorySelectedListener>() {
public void fireEvent(DirectorySelectedListener listener) {
listener.directorySelected(directory);
}
});
}
private void loadFileList(File path) {
this.currentPath = path;
List<String> r = new ArrayList<String>();
if (path.exists()) {
if (path.getParentFile() != null) r.add(PARENT_DIR);
FilenameFilter filter = new FilenameFilter() {
public boolean accept(File dir, String filename) {
File sel = new File(dir, filename);
if (!sel.canRead()) return false;
if (selectDirectoryOption) return sel.isDirectory();
else {
boolean endsWith = fileEndsWith != null ? filename.toLowerCase().endsWith(fileEndsWith) : true;
return endsWith || sel.isDirectory();
}
}
};
String[] fileList1 = path.list(filter);
if (fileList1 == null) {
} else {
for (String file : fileList1) {
r.add(file);
}
}
}
fileList = (String[]) r.toArray(new String[]{});
}
private File getChosenFile(String fileChosen) {
if (fileChosen.equals(PARENT_DIR)) return currentPath.getParentFile();
else return new File(currentPath, fileChosen);
}
private void setFileEndsWith(String fileEndsWith) {
this.fileEndsWith = fileEndsWith != null ? fileEndsWith.toLowerCase() : fileEndsWith;
}
}
3）ListenerList接口：------------
class ListenerList<L> {
private List<L> listenerList = new ArrayList<L>();
public interface FireHandler<L> {
void fireEvent(L listener);
}
public void add(L listener) {
listenerList.add(listener);
}
public void fireEvent(FireHandler<L> fireHandler) {
List<L> copy = new ArrayList<L>(listenerList);
for (L l : copy) {
fireHandler.fireEvent(l);
}
}
public void remove(L listener) {
listenerList.remove(listener);
}
public List<L> getListenerList() {
return listenerList;
}
}
4）activity_main.xml：----------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:gravity="center">
<ImageView
android:layout_width="200dp"
android:layout_height="200dp"
tools:ignore="contentDescription"
android:id="@+id/iv"/>
<Button
android:layout_width="200dp"
android:layout_height="50dp"
android:text="Take Pic"
android:id="@+id/b"/>
</LinearLayout>
5）注意：FileDialog类和ListenerList接口来自：Choose File Dialog