我想从内部存储或卡片制作文件选择器。 我尝试了很多代码，但它不能满足我的需求。 请有人给我发送源代码或示例。 提前谢谢!!!!! 在这里我的代码 -
FilePick_MainActivity.java
public class FilePick_MainActivity extends Activity implements OnClickListener {
private static final int REQUEST_PICK_FILE = 1;
private TextView filePath;
private Button Browse;
private File selectedFile;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_file_pick__main);
filePath = (TextView)findViewById(R.id.file_path);
Browse = (Button)findViewById(R.id.browse);
Browse.setOnClickListener(this);
}
public void onClick(View v) {
switch(v.getId()) {
case R.id.browse:
Intent intent = new Intent(this, FilePicker.class);
startActivityForResult(intent, REQUEST_PICK_FILE);
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(resultCode == RESULT_OK) {
switch(requestCode) {
case REQUEST_PICK_FILE:
if(data.hasExtra(FilePicker.EXTRA_FILE_PATH)) {
selectedFile = new File
(data.getStringExtra(FilePicker.EXTRA_FILE_PATH));
filePath.setText(selectedFile.getPath());
}
break;
}
}
}
FilePicker.java
package com.example.rama.filepick;
public class FilePicker extends ListActivity {
public final static String EXTRA_FILE_PATH = "file_path";
public final static String EXTRA_SHOW_HIDDEN_FILES = "show_hidden_files";
public final static String EXTRA_ACCEPTED_FILE_EXTENSIONS = "accepted_file_extensions";
private final static String DEFAULT_INITIAL_DIRECTORY = "/";
protected File Directory;
protected ArrayList<File> Files;
protected FilePickerListAdapter Adapter;
protected boolean ShowHiddenFiles = false;
protected String[] acceptedFileExtensions;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LayoutInflater inflator = (LayoutInflater)
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View emptyView = inflator.inflate(R.layout.empty_view, null);
((ViewGroup) getListView().getParent()).addView(emptyView);
getListView().setEmptyView(emptyView);
Directory = new File(DEFAULT_INITIAL_DIRECTORY);
Files = new ArrayList<File>();
Adapter = new FilePickerListAdapter(this, Files);
setListAdapter(Adapter);
acceptedFileExtensions = new String[] {};
if(getIntent().hasExtra(EXTRA_FILE_PATH))
Directory = new File(getIntent().getStringExtra(EXTRA_FILE_PATH));
if(getIntent().hasExtra(EXTRA_SHOW_HIDDEN_FILES))
ShowHiddenFiles = getIntent().getBooleanExtra(EXTRA_SHOW_HIDDEN_FILES, false);
if(getIntent().hasExtra(EXTRA_ACCEPTED_FILE_EXTENSIONS)) {
ArrayList<String> collection =
getIntent().getStringArrayListExtra(EXTRA_ACCEPTED_FILE_EXTENSIONS);
acceptedFileExtensions = (String[])
collection.toArray(new String[collection.size()]);
}
}
@Override
protected void onResume() {
refreshFilesList();
super.onResume();
}
protected void refreshFilesList() {
Files.clear();
ExtensionFilenameFilter filter =
new ExtensionFilenameFilter(acceptedFileExtensions);
File[] files = Directory.listFiles(filter);
if(files != null && files.length > 0) {
for(File f : files) {
if(f.isHidden() && !ShowHiddenFiles) {
continue;
}
Files.add(f);
}
Collections.sort(Files, new FileComparator());
}
Adapter.notifyDataSetChanged();
}
@Override
public void onBackPressed() {
if(Directory.getParentFile() != null) {
Directory = Directory.getParentFile();
refreshFilesList();
return;
}
super.onBackPressed();
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
File newFile = (File)l.getItemAtPosition(position);
if(newFile.isFile()) {
Intent extra = new Intent();
extra.putExtra(EXTRA_FILE_PATH, newFile.getAbsolutePath());
setResult(RESULT_OK, extra);
finish();
}
else {
Directory = newFile;
refreshFilesList();
}
super.onListItemClick(l, v, position, id);
}
private class FilePickerListAdapter extends ArrayAdapter<File> {
private List<File> mObjects;
public FilePickerListAdapter(Context context, List<File> objects) {
super(context, R.layout.list_item, android.R.id.text1, objects);
mObjects = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = null;
if(convertView == null) {
LayoutInflater inflater = (LayoutInflater)
getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.list_item, parent, false);
}
else
row = convertView;
File object = mObjects.get(position);
ImageView imageView = (ImageView)row.findViewById(R.id.file_picker_image);
TextView textView = (TextView)row.findViewById(R.id.file_picker_text);
textView.setSingleLine(true);
textView.setText(object.getName());
if(object.isFile())
imageView.setImageResource(R.drawable.file);
else
imageView.setImageResource(R.drawable.folder);
return row;
}
}
private class FileComparator implements Comparator<File> {
public int compare(File f1, File f2) {
if(f1 == f2)
return 0;
if(f1.isDirectory() && f2.isFile())
return -1;
if(f1.isFile() && f2.isDirectory())
return 1;
return f1.getName().compareToIgnoreCase(f2.getName());
}
}
private class ExtensionFilenameFilter implements FilenameFilter {
private String[] Extensions;
public ExtensionFilenameFilter(String[] extensions) {
super();
Extensions = extensions;
}
public boolean accept(File dir, String filename) {
if(new File(dir, filename).isDirectory()) {
return true;
}
if(Extensions != null && Extensions.length > 0) {
for(int i = 0; i < Extensions.length; i++) {
if(filename.endsWith(Extensions[i])) {
return true;
}
}
return false;
}
return true;
}
}
Android manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="rama.Filebrowse"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="5"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.rama.filepick.FilePicker"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.example.rama.filepick.MainActivity"> </activity>
</application>
</manifest>
当我运行此代码时，它只显示android系统文件夹和文件，而不是内部存储和SD卡。