需要浏览按钮吗? [英] Browse Button required?
本文介绍了需要浏览按钮吗?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在开发一个需要使用浏览按钮选择文件的应用程序. 如何在android中实现浏览按钮?
Hii i am working on an application in which i require to select files using browse button.. How can i implement a browse button in android?
推荐答案
下面是示例应用程序中的完整代码.我使用了一个按钮，它将从手机的任何目录中选择文件.
Below is whole code from my sample application. I used a button which will pick files from any directory of your phone.
布局
file_picker_empty_view.xml
file_picker_empty_view.xml
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="No files or directories"
android:background="@android:drawable/toast_frame"
android:textSize="28sp"
android:gravity="center_vertical|center_horizontal"/>
file_picker_list_item.xml
file_picker_list_item.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:id="@+id/file_picker_image"
android:layout_width="40dip"
android:layout_height="40dip"
android:layout_marginTop="5dip"
android:layout_marginBottom="5dip"
android:layout_marginLeft="5dip"
android:src="@drawable/file"
android:scaleType="centerCrop"/>
<TextView
android:id="@+id/file_picker_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="left|center_vertical"
android:textSize="28sp"
android:layout_marginLeft="10dip"
android:singleLine="true"
android:text="filename"/>
</LinearLayout>
file_view.xml
file_view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_width="fill_parent">
<TextView android:text="@+id/TextView01"
android:id="@+id/TextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
android:textStyle="bold"
android:layout_marginTop="5dip"
android:layout_marginLeft="5dip"></TextView>
<TextView android:text="@+id/TextView02"
android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dip"></TextView>
</LinearLayout>
main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_vertical">
<Button android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/start_file_picker_button"
android:text="Browse" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Selected file"
android:textStyle="bold"
android:textColor="#fff"
android:textSize="24sp" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/file_path_text_view"
android:text="No file has been selected"
android:textSize="18sp" />
</LinearLayout>
活动
FilePickerActivity
FilePickerActivity
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
/**
*
* @author pankaj
*
*/
public class FilePickerActivity 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 mDirectory;
protected ArrayList<File> mFiles;
protected FilePickerListAdapter mAdapter;
protected boolean mShowHiddenFiles = false;
protected String[] acceptedFileExtensions;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set the view to be shown if the list is empty
LayoutInflater inflator = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View emptyView = inflator.inflate(R.layout.file_picker_empty_view, null);
((ViewGroup)getListView().getParent()).addView(emptyView);
getListView().setEmptyView(emptyView);
// Set initial directory
mDirectory = new File(DEFAULT_INITIAL_DIRECTORY);
// Initialize the ArrayList
mFiles = new ArrayList<File>();
// Set the ListAdapter
mAdapter = new FilePickerListAdapter(this, mFiles);
setListAdapter(mAdapter);
// Initialize the extensions array to allow any file extensions
acceptedFileExtensions = new String[] {};
// Get intent extras
if(getIntent().hasExtra(EXTRA_FILE_PATH)) {
mDirectory = new File(getIntent().getStringExtra(EXTRA_FILE_PATH));
}
if(getIntent().hasExtra(EXTRA_SHOW_HIDDEN_FILES)) {
mShowHiddenFiles = 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();
}
/**
* Updates the list view to the current directory
*/
protected void refreshFilesList() {
// Clear the files ArrayList
mFiles.clear();
// Set the extension file filter
ExtensionFilenameFilter filter = new ExtensionFilenameFilter(acceptedFileExtensions);
// Get the files in the directory
File[] files = mDirectory.listFiles(filter);
if(files != null && files.length > 0) {
for(File f : files) {
if(f.isHidden() && !mShowHiddenFiles) {
// Don't add the file
continue;
}
// Add the file the ArrayAdapter
mFiles.add(f);
}
Collections.sort(mFiles, new FileComparator());
}
mAdapter.notifyDataSetChanged();
}
@Override
public void onBackPressed() {
if(mDirectory.getParentFile() != null) {
// Go to parent directory
mDirectory = mDirectory.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()) {
// Set result
Intent extra = new Intent();
extra.putExtra(EXTRA_FILE_PATH, newFile.getAbsolutePath());
setResult(RESULT_OK, extra);
// Finish the activity
finish();
} else {
mDirectory = newFile;
// Update the files list
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.file_picker_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.file_picker_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);
// Set single line
textView.setSingleLine(true);
textView.setText(object.getName());
if(object.isFile()) {
// Show the file icon
imageView.setImageResource(R.drawable.file);
} else {
// Show the folder icon
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()) {
// Show directories above files
return -1;
}
if(f1.isFile() && f2.isDirectory()) {
// Show files below directories
return 1;
}
// Sort the directories alphabetically
return f1.getName().compareToIgnoreCase(f2.getName());
}
}
private class ExtensionFilenameFilter implements FilenameFilter {
private String[] mExtensions;
public ExtensionFilenameFilter(String[] extensions) {
super();
mExtensions = extensions;
}
public boolean accept(File dir, String filename) {
if(new File(dir, filename).isDirectory()) {
// Accept all directory names
return true;
}
if(mExtensions != null && mExtensions.length > 0) {
for(int i = 0; i < mExtensions.length; i++) {
if(filename.endsWith(mExtensions[i])) {
// The filename ends with the extension
return true;
}
}
// The filename did not match any of the extensions
return false;
}
// No extensions has been set. Accept all file extensions.
return true;
}
}
}
MainActivity//这必须是您的默认Activity，如清单中的MAIN
MainActivity // This must be your default Activity, as MAIN in manifest
public class MainActivity extends Activity implements OnClickListener {
private static final int REQUEST_PICK_FILE = 1;
private TextView mFilePathTextView;
private Button mStartActivityButton;
private File selectedFile;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Set the views
mFilePathTextView = (TextView)findViewById(R.id.file_path_text_view);
mStartActivityButton = (Button)findViewById(R.id.start_file_picker_button);
mStartActivityButton.setOnClickListener(this);
}
public void onClick(View v) {
switch(v.getId()) {
case R.id.start_file_picker_button:
// Create a new Intent for the file picker activity
Intent intent = new Intent(this, FilePickerActivity.class);
// Set the initial directory to be the sdcard
//intent.putExtra(FilePickerActivity.EXTRA_FILE_PATH, Environment.getExternalStorageDirectory());
// Show hidden files
//intent.putExtra(FilePickerActivity.EXTRA_SHOW_HIDDEN_FILES, true);
// Only make .png files visible
//ArrayList<String> extensions = new ArrayList<String>();
//extensions.add(".png");
//intent.putExtra(FilePickerActivity.EXTRA_ACCEPTED_FILE_EXTENSIONS, extensions);
// Start the activity
startActivityForResult(intent, REQUEST_PICK_FILE);
break;
case R.id.You_can_handle_more_onclick_events_from_here:
//Do something
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(resultCode == RESULT_OK) {
switch(requestCode) {
case REQUEST_PICK_FILE:
if(data.hasExtra(FilePickerActivity.EXTRA_FILE_PATH)) {
// Get the file path
selectedFile = new File(data.getStringExtra(FilePickerActivity.EXTRA_FILE_PATH));
// Set the file path text view
mFilePathTextView.setText(selectedFile.getPath());
//Now you have your selected file, You can do your additional requirement with file.
}
}
}
}
}
现在Iam正在上传图片，您可以使用自己的图片.
Now Iam uploading images, You can use your own images.
图片名称:文件
图片名称:文件夹
最后
AndroidManifest.xml
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.myContactAdder.adder"
android:versionCode="1"
android:versionName="1.0">
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".FilePickerActivity"
android:label="@string/app_name">
</activity>
<activity android:name=".MainActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="7" />
</manifest>
这些是更多信息的链接: Android文件选择器的活动和创建简单文件选择器.
These are links for more information: Android file picker Activity and Creating simple file chooser.
这篇关于需要浏览按钮吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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