主類

public class main extends ListActivity/*繼承這個類就可以直接進入安卓文件目錄*/{
private static final String ROOT_PATH = "/";
//存儲文件名稱
private ArrayList<String> mFileName = null;
//存儲文件路徑
private ArrayList<String> mFilePath = null;
//重命名布局xml文件顯示dialog
private View view;

private EditText editText;

/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//顯示文件列表
showFileDir(ROOT_PATH);
}

/**
* 掃描顯示文件列表 ，第一次才這樣
* @param path
*/
private void showFileDir(String path) {
mFileName = new ArrayList<String>();
mFilePath = new ArrayList<String>();// ------路徑-------
File file = new File(path);

File[] files = file.listFiles();
//如果當前目錄不是根目錄,預防萬一
if (!ROOT_PATH.equals(path)) {
mFileName.add("@1");
mFilePath.add(ROOT_PATH);
mFileName.add("@2");
mFilePath.add(file.getParent());
}
//添加所有文件
for (File f : files) {
mFileName.add(f.getName());
mFilePath.add(f.getPath());
}
this.setListAdapter(new MyAdapter(this, mFileName, mFilePath));
}

/**
* 點擊事件，點擊文件夾獲取路徑
* @param l
* @param v
* @param position
* @param id
*/
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
String path = mFilePath.get(position);
File file = new File(path);
// 文件存在並可讀
if (file.exists() && file.canRead()) {
if (file.isDirectory()) {
//顯示子目錄及文件 -----------------我要學的------------------
showFileDir(path);
} else {
//處理文件
fileHandle(file);
}
}
//沒有權限
else {
Resources res = getResources();
new AlertDialog.Builder(this).setTitle("Message")
.setMessage(res.getString(R.drawable.ic_launcher))
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "打開不了", Toast.LENGTH_SHORT).show();
}
}).show();
}
super.onListItemClick(l, v, position, id);
}

//對文件進行增刪改
private void fileHandle(final File file) {
DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// 打開文件
if (which == 0) {
openFile(file); //--------------------我要學的-------------------
}
//修改文件名
else if (which == 1) {
LayoutInflater factory = LayoutInflater.from(main.this);
view = factory.inflate(R.layout.rename_dialog, null);
editText = (EditText) view.findViewById(R.id.editText);
editText.setText(file.getName());

DialogInterface.OnClickListener listener2 = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
String modifyName = editText.getText().toString();
final String fpath = file.getParentFile().getPath();
final File newFile = new File(fpath + "/" + modifyName);
if (newFile.exists()) {
//排除沒有修改情況
if (!modifyName.equals(file.getName())) {
new AlertDialog.Builder(main.this)
.setTitle("註意!")
.setMessage("文件名已存在，是否覆蓋？")
.setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (file.renameTo(newFile)) {
showFileDir(fpath);
displayToast("重命名成功！");
} else {
displayToast("重命名失敗！");
}
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {

}
})
.show();
}
} else {
if (file.renameTo(newFile)) {
showFileDir(fpath);
displayToast("重命名成功！");
} else {
displayToast("重命名失敗！");
}
}
}
};
AlertDialog renameDialog = new AlertDialog.Builder(main.this).create();
renameDialog.setView(view);
renameDialog.setButton("確定", listener2);
renameDialog.setButton2("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
renameDialog.show();
}else if (which ==2) {//音樂
//找路徑
Toast.makeText(getApplicationContext(), "我是音樂", Toast.LENGTH_LONG).show();
Music.IntetnMusic(main.this, file.getName(), file.getPath());

}else if (which == 3) {//視頻
Toast.makeText(getApplicationContext(), "我是視頻", Toast.LENGTH_LONG).show();
Video.ActivityVideo(main.this, file.getName(), file.getPath());
}
//刪除文件
else {
new AlertDialog.Builder(main.this)
.setTitle("註意!")
.setMessage("確定要刪除此文件嗎？")
.setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (file.delete()) {
//更新文件列表
showFileDir(file.getParent());
displayToast("刪除成功！");
} else {
displayToast("刪除失敗！");
}
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
}).show();
}
}
};
//選擇文件時，彈出增刪該操作選項對話框
String[] menu = {"打開文件", "重命名","播放音樂","播放視頻", "刪除文件"};
new AlertDialog.Builder(main.this)
.setTitle("請選擇要進行的操作!")
.setItems(menu, listener)
.setPositiveButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
}).show();
}

//打開文件
private void openFile(File file) {
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
String type = getMIMEType(file);
intent.setDataAndType(Uri.fromFile(file), type);
startActivity(intent);
}

//獲取文件mimetype
private String getMIMEType(File file) {
String type = "";
String name = file.getName();
//文件擴展名
String end = name.substring(name.lastIndexOf(".") + 1, name.length()).toLowerCase();
if (end.equals("m4a") || end.equals("mp3") || end.equals("wav")) {
type = "audio";
} else if (end.equals("mp4") || end.equals("3gp")) {
type = "video";
} else if (end.equals("jpg") || end.equals("png") || end.equals("jpeg") || end.equals("bmp") || end.equals("gif")) {
type = "image";
} else {
//如果無法直接打開，跳出列表由用戶選擇
type = "*"; //調用系統選項
}
type += "/*";
return type;
}

private void displayToast(String message) {
Toast.makeText(main.this, message, Toast.LENGTH_SHORT).show();
}

public boolean onCreateOptionsMenu(Menu menu) {
//super.getMenuInflater().inflate(R.menu.main_menu, menu);
menu.add(Menu.NONE, Menu.FIRST + 1, 7, "新建")
.setIcon(android.R.drawable.ic_menu_send);
menu.add(Menu.NONE, Menu.FIRST + 2, 3, "取消")
.setIcon(android.R.drawable.ic_menu_edit);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case Menu.FIRST + 1:{
final EditText editText = new EditText(main.this);
new AlertDialog.Builder(main.this).setTitle("請輸入文件名稱").setView(editText).setPositiveButton("確定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
String mFileName = editText.getText().toString();
String IMAGES_PATH = Environment.getExternalStorageDirectory() + "/" + mFileName + "/"; //獲取根目錄
//String IMAGES_PATH = getApplicationContext().getFilesDir().getAbsolutePath() + "/" + mFileName + "/";
createMkdir(IMAGES_PATH);
}
}).setNegativeButton("取消", null).show();
}
break;
case Menu.FIRST + 2:
Toast.makeText(this, "取消", Toast.LENGTH_LONG).show();
break;
}
return false;
}
public static void createMkdir(String folderPath) {
File folder = new File(folderPath);
if (!folder.exists()) {
folder.mkdir();
}
}

public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
finish();
return true;
} else {
return super.onKeyDown(keyCode, event);
}

}
}

適配器：

public class MyAdapter extends BaseAdapter{
private LayoutInflater inflater;
private Bitmap directory, file;
//存儲文件名稱
private ArrayList<String> names = null;
//存儲文件路徑
private ArrayList<String> paths = null;

//參數初始化
public MyAdapter(Context context, ArrayList<String> na, ArrayList<String> pa) {
names = na;
paths = pa;
directory = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher);
file = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher);
//縮小圖片
directory = small(directory, 0.16f);
file = small(file, 0.1f);
inflater = LayoutInflater.from(context);
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return names.size();
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return names.get(position);
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder;
if (null == convertView) {
convertView = inflater.inflate(R.layout.file, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.textView);
holder.image = (ImageView) convertView.findViewById(R.id.imageView);

convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
File f = new File(paths.get(position).toString());
if (names.get(position).equals("@1")) {
holder.text.setText("/");
holder.image.setImageBitmap(directory);
} else if (names.get(position).equals("@2")) {
holder.text.setText("..");
holder.image.setImageBitmap(directory);
} else {
holder.text.setText(f.getName());
if (f.isDirectory()) {
holder.image.setImageBitmap(directory);
} else if (f.isFile()) {
holder.image.setImageBitmap(file);
} else {
System.out.println(f.getName());
}
}
return convertView;
}

private class ViewHolder {
private TextView text;
private ImageView image;
}

private Bitmap small(Bitmap map, float num) {
Matrix matrix = new Matrix();
matrix.postScale(num, num);
return Bitmap.createBitmap(map, 0, 0, map.getWidth(), map.getHeight(), matrix, true);
}
}

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