This case mainly talks about Android using GridView to load all directories under SD card, multi-layer traversal of folders, modification of file icons, and setting the corresponding opening method of files.
As shown in the figure:
Code:
public class GridViewFile extends Activity implements View.OnClickListener {
private Context context;
private TextView tv_title, textView;
private GridView listView;
private final String MUSIC_PATH = "/";
// record an array of all files in the current path
File currentParent;
// Record the file array of all files under the current path
File[] currentFiles;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
initView();
}
public void initView() {
findViewById(R.id.public_top_img_close).setOnClickListener(this);
listView = (GridView) findViewById(R.id.gridview);
textView = (TextView) findViewById(R.id.llss);
onLoad();
}
public void onLoad() {
ListSongsName();
}
private void ListSongsName() {
// Get the SD card directory of the system
File root = new File(MUSIC_PATH);
// if SD card exists
if (root.exists()) {
currentParent = root;
currentFiles = root.listFiles();// Get all files in the root directory
// Use all files and folders under the current Lu Mu to populate the ListView
inflateListView(currentFiles);
}
// Bind the monitor for the click event of the ListView's list item
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// If the user clicks on the file, call the installed software on the phone to operate the file
if (currentFiles[position].isFile()) {
onError(currentFiles[position].getPath() + "1");
Intent intent = OpenFile.openFile(currentFiles[position]
.getPath());
startActivity(intent);
} else {
// Get all files under the currentFiles[position] path
File[] tmp = currentFiles[position].listFiles();
if (tmp == null || tmp.length == 0) {
Toast.makeText(GridViewFile.this, "Empty folder!",
Toast.LENGTH_SHORT).show();
}// if
else {
// Get the folder corresponding to the list item clicked by the user and set it as the current parent folder
currentParent = currentFiles[position];
// Save all asks and folders in the current folder
currentFiles = tmp;
inflateListView(currentFiles);
}
}
}
});
}
// update list
private void inflateListView(File[] files) {
if (files.length == 0)
Toast.makeText(GridViewFile.this, "sd card does not exist", Toast.LENGTH_SHORT)
.show();
else {
// Create a List collection, the elements of the List collection are Map
List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>();
for (int i = 0; i < files.length; i++) {
Map<String, Object> listItem = new HashMap<String, Object>();
// If the current File is a folder, use the folder icon; otherwise, use the file icon
Log.i("path", files[i].getPath());
Log.i("path", files[i].getName());
if (files[i].isDirectory())
listItem.put("icon", R.drawable.file_wenjianjia);
// else if(files[i].isFi)
else
listItem.put("icon", R.drawable.file_wenjian1);
listItem.put("fileName", files[i].getName());
// add List item
listItems.add(listItem);
}
// Create a SimpleAdapter
SimpleAdapter simpleAdapter = new SimpleAdapter(this, listItems,
R.layout.acheshi_item, new String[] { "icon", "fileName" },
new int[] { R.id.imageView1, R.id.text_path });
// Bit ListView set Adpter
listView.setAdapter(simpleAdapter);
try {
textView.setText("The current path is: " + currentParent.getCanonicalPath());
} catch (IOException e) {
e.printStackTrace ();
}
}
}
@Override
public void onClick(View v) {
onbey ();
}
// return to the upper menu
private void onbey() {
try {
if (!MUSIC_PATH.equals(currentParent.getCanonicalPath())) {
// Get the previous directory
currentParent = currentParent.getParentFile();
// list all files in the current directory
currentFiles = currentParent.listFiles();
// Update the ListView again
inflateListView(currentFiles);
} else {
new AlertDialog.Builder(this)
.setIcon(R.drawable.ic_launcher)
.setTitle("Title")
.setMessage("Are you sure you want to exit?")
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
finish();
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
}
}).create().show();
}
} catch (Exception e) {
e.printStackTrace ();
}
}
public void onError(Object error) {
Toast.makeText(getApplicationContext(), error + "", Toast.LENGTH_LONG)
.show();
}
protected void onDestroy() {
super.onDestroy ();
}
}
/**
* Call the application corresponding to the system to open the file according to the path
*/
public class OpenFile {
public static Intent openFile(String filePath){
File file = new File(filePath);
if(!file.exists()) return null;
/* get the extension */
String end=file.getName().substring(file.getName().lastIndexOf(".") + 1,file.getName().length()).toLowerCase();
/* MimeType is determined by extension type */
if(end.equals("m4a")||end.equals("mp3")||end.equals("mid")||
end.equals("xmf")||end.equals("ogg")||end.equals("wav")){
return getAudioFileIntent(filePath);
}else if(end.equals("3gp")||end.equals("mp4")){
return getAudioFileIntent(filePath);
}else if(end.equals("jpg")||end.equals("gif")||end.equals("png")||
end.equals("jpeg")||end.equals("bmp")){
return getImageFileIntent(filePath);
}else if(end.equals("apk")){
return getApkFileIntent(filePath);
}else if(end.equals("ppt")){
return getPptFileIntent(filePath);
}else if(end.equals("xls")){
return getExcelFileIntent(filePath);
}else if(end.equals("doc")){
return getWordFileIntent(filePath);
}else if(end.equals("pdf")){
return getPdfFileIntent(filePath);
}else if(end.equals("chm")){
return getChmFileIntent(filePath);
}else if(end.equals("txt")){
return getTextFileIntent(filePath,false);
}else{
return getAllIntent(filePath);
}
}
//Android gets an intent for opening the APK file
public static Intent getAllIntent( String param ) {
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);//动作
Uri uri = Uri.fromFile (new File (param)); // Stereotype
intent.setDataAndType(uri,"*/*");
return intent;
}
//Android gets an intent for opening the APK file
public static Intent getApkFileIntent( String param ) {
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
Uri uri = Uri.fromFile (new File (param));
intent.setDataAndType(uri,"application/vnd.android.package-archive");
return intent;
}
//Android gets an intent for opening the VIDEO file
public static Intent getVideoFileIntent( String param ) {
Intent intent = new Intent("android.intent.action.VIEW");
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("oneshot", 0);
intent.putExtra("configchange", 0);
Uri uri = Uri.fromFile (new File (param));
intent.setDataAndType(uri, "video/*");
return intent;
}
//Android gets an intent for opening the AUDIO file
public static Intent getAudioFileIntent( String param ){
Intent intent = new Intent("android.intent.action.VIEW");
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("oneshot", 0);
intent.putExtra("configchange", 0);
Uri uri = Uri.fromFile (new File (param));
intent.setDataAndType(uri, "audio/*");
return intent;
}
//Android gets an intent for opening the Html file
public static Intent getHtmlFileIntent( String param ){
Uri uri = Uri.parse(param ).buildUpon().encodedAuthority("com.android.htmlfileprovider").scheme("content").encodedPath(param ).build();
Intent intent = new Intent("android.intent.action.VIEW");
intent.setDataAndType(uri, "text/html");
return intent;
}
//Android gets an intent for opening the image file
public static Intent getImageFileIntent( String param ) {
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile (new File (param));
intent.setDataAndType(uri, "image/*");
return intent;
}
//Android gets an intent for opening the PPT file
public static Intent getPptFileIntent( String param ){
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile (new File (param));
intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
return intent;
}
//Android gets an intent for opening an Excel file
public static Intent getExcelFileIntent( String param ){
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile (new File (param));
intent.setDataAndType(uri, "application/vnd.ms-excel");
return intent;
}
//Android gets an intent for opening the Word file
public static Intent getWordFileIntent( String param ){
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile (new File (param));
intent.setDataAndType(uri, "application/msword");
return intent;
}
//Android gets an intent for opening the CHM file
public static Intent getChmFileIntent( String param ){
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile (new File (param));
intent.setDataAndType(uri, "application/x-chm");
return intent;
}
//Android gets an intent for opening a text file
public static Intent getTextFileIntent( String param, boolean paramBoolean){
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
if (paramBoolean){
Uri uri1 = Uri.parse (param);
intent.setDataAndType(uri1, "text/plain");
}else{
Uri uri2 = Uri.fromFile(new File(param ));
intent.setDataAndType(uri2, "text/plain");
}
return intent;
}
//Android gets an intent for opening PDF files
public static Intent getPdfFileIntent( String param ){
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile (new File (param));
intent.setDataAndType(uri, "application/pdf");
return intent;
}
}
Don't forget to add permissions in AndroidManifest.xml!
<!-- SD card permissions-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />