此案例主要说的是Android使用GridView加载SD卡下所有目录，文件夹多层遍历，文件图标修改，设置文件对应打开方式等功能。
如图：
代码：
public class GridViewFile extends Activity implements View.OnClickListener {
private Context context;
private TextView tv_title, textView;
private GridView listView;
private final String MUSIC_PATH = "/";
// 记录当前路径下 的所有文件的数组
File currentParent;
// 记录当前路径下的所有文件的文件数组
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() {
// 获取系统的SD卡目录
File root = new File(MUSIC_PATH);
// 如果SD卡存在
if (root.exists()) {
currentParent = root;
currentFiles = root.listFiles();// 获取root目录下的所有文件
// 使用当前陆慕下的全部文件，文件夹来填充ListView
inflateListView(currentFiles);
}
// 为ListView的列表项的单击事件绑定监视器
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// 用户点击了文件，则调用手机已安装软件操作该文件
if (currentFiles[position].isFile()) {
onError(currentFiles[position].getPath() + "1");
Intent intent = OpenFile.openFile(currentFiles[position]
.getPath());
startActivity(intent);
} else {
// 获取currentFiles[position]路径下的所有文件
File[] tmp = currentFiles[position].listFiles();
if (tmp == null || tmp.length == 0) {
Toast.makeText(GridViewFile.this, "空文件夹!",
Toast.LENGTH_SHORT).show();
}// if
else {
// 获取用户单击的列表项对应的文件夹，设为当前的父文件夹
currentParent = currentFiles[position];
// 保存当前文件夹内的全部问价和文件夹
currentFiles = tmp;
inflateListView(currentFiles);
}
}
}
});
}
// 更新列表
private void inflateListView(File[] files) {
if (files.length == 0)
Toast.makeText(GridViewFile.this, "sd卡不存在", Toast.LENGTH_SHORT)
.show();
else {
// 创建一个List集合,List集合的元素是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>();
// 如果当前File是文件夹，使用folder图标；否则使用file图标
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());
// 添加List项
listItems.add(listItem);
}
// 创建一个SimpleAdapter
SimpleAdapter simpleAdapter = new SimpleAdapter(this, listItems,
R.layout.acheshi_item, new String[] { "icon", "fileName" },
new int[] { R.id.imageView1, R.id.text_path });
// 位ListView设置Adpter
listView.setAdapter(simpleAdapter);
try {
textView.setText("当前路径为：" + currentParent.getCanonicalPath());
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
public void onClick(View v) {
onbey();
}
// 返回上层菜单
private void onbey() {
try {
if (!MUSIC_PATH.equals(currentParent.getCanonicalPath())) {
// 获取上一层目录
currentParent = currentParent.getParentFile();
// 列出当前目录下的所有文件
currentFiles = currentParent.listFiles();
// 再次更新ListView
inflateListView(currentFiles);
} else {
new AlertDialog.Builder(this)
.setIcon(R.drawable.ic_launcher)
.setTitle("提示")
.setMessage("确定要退出吗？")
.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
finish();
}
})
.setNegativeButton("取消",
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();
}
}
/**
* 根据路径调用系统对应的应用打开文件
*/
public class OpenFile {
public static Intent openFile(String filePath){
File file = new File(filePath);
if(!file.exists()) return null;
/* 取得扩展名 */
String end=file.getName().substring(file.getName().lastIndexOf(".") + 1,file.getName().length()).toLowerCase();
/* 依扩展名的类型决定MimeType */
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获取一个用于打开APK文件的intent
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 ));//转换类型
intent.setDataAndType(uri,"*/*");
return intent;
}
//Android获取一个用于打开APK文件的intent
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获取一个用于打开VIDEO文件的intent
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获取一个用于打开AUDIO文件的intent
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获取一个用于打开Html文件的intent
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获取一个用于打开图片文件的intent
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获取一个用于打开PPT文件的intent
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获取一个用于打开Excel文件的intent
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获取一个用于打开Word文件的intent
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获取一个用于打开CHM文件的intent
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获取一个用于打开文本文件的intent
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获取一个用于打开PDF文件的intent
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;
}
}
不要忘记在AndroidManifest.xml加权限哦！
<!-- SD卡权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />