編輯：關於Android編程
一、資源管理器介紹
現在在一些移動終端上面都會有自帶的資源管理器，其實其並非是Android系統自帶，而是手機產商與app開發商的合作而導致融合，借助第三方的開發軟件預裝在出廠的手機，是新時代下的另一個霸王條款，還不能自行刪除，十分麻煩。
背景鋪墊完畢，由於十分討厭這種不公平的手段，為此自行寫一個實現文件資源管理器，功能基本上實現，實用不美觀，不喜勿噴！
二、實現函數詳解
1、顯示文件列表
/**
* 掃描顯示文件列表
* @param path
*/
private void showFileDir(String path) {
mFileName = new ArrayList();
mFilePath = new ArrayList();
File file = new File(path);
File[] files = file.listFiles();
//如果當前目錄不是根目錄
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));
}
2、Item點擊事件
/**
* 點擊事件
* @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
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.string.no_permission))
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "沒有權限刪除不了..", Toast.LENGTH_SHORT).show();
}
}).show();
}
super.onListItemClick(l, v, position, id);
}
3、對文件進行重命名
public void onClick(DialogInterface dialog, int which) {
// 打開文件
if (which == 0) {
openFile(file);
}
//修改文件名
else if (which == 1) {
LayoutInflater factory = LayoutInflater.from(MainActivity.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(MainActivity.this)
.setTitle("注意!")
.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(MainActivity.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();
}
4、對文件進行刪除
public void onClick(DialogInterface dialog, int which) {
// 打開文件
if (which == 0) {
openFile(file);
}
//修改文件名
else if (which == 1) {
LayoutInflater factory = LayoutInflater.from(MainActivity.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(MainActivity.this)
.setTitle("注意!")
.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(MainActivity.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();
}
5、打開文件
//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);
}
6、onCreateOptionsMenu重寫，實現新建文件夾
public static void createMkdir(String folderPath) {
File folder = new File(folderPath);
if (!folder.exists()) {
folder.mkdir();
}
}
三、實現步驟
1、activity_main.xml,主界面布局，最重要的既是ListView浏覽方式。
2、file.xml,Item的布局方式。
3、rename_dialog.xml,自定義Dialog方式。
4、MainActivity.java,主Activity,所有事項函數。
package example.com.filemanager;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.res.Resources;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import java.io.File;
import java.util.ArrayList;
public class MainActivity extends ListActivity {
private static final String ROOT_PATH = "/";
//存儲文件名稱
private ArrayList mFileName = null;
//存儲文件路徑
private ArrayList 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.activity_main);
//顯示文件列表
showFileDir(ROOT_PATH);
}
/**
* 掃描顯示文件列表
* @param path
*/
private void showFileDir(String path) {
mFileName = new ArrayList();
mFilePath = new ArrayList();
File file = new File(path);
File[] files = file.listFiles();
//如果當前目錄不是根目錄
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
* @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
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.string.no_permission))
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "沒有權限刪除不了..", 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);
}
//修改文件名
else if (which == 1) {
LayoutInflater factory = LayoutInflater.from(MainActivity.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(MainActivity.this)
.setTitle("注意!")
.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(MainActivity.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();
}
//刪除文件
else {
new AlertDialog.Builder(MainActivity.this)
.setTitle("注意!")
.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", "刪除文件"};
new AlertDialog.Builder(MainActivity.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 = "*";
}
type += "/*";
return type;
}
private void displayToast(String message) {
Toast.makeText(MainActivity.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(MainActivity.this);
new AlertDialog.Builder(MainActivity.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);
}
}
}
5、MyAdapter.java
package example.com.filemanager;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.io.File;
import java.util.ArrayList;
/**
* Title: FileManager
* Package example.com.filemanager
* Description: ${TODO}
* author Jimmy.li
* Date: 2016-06-23
* Time: 14:16
* version V1.0
*/
public class MyAdapter extends BaseAdapter {
private LayoutInflater inflater;
private Bitmap directory, file;
//存儲文件名稱
private ArrayList names = null;
//存儲文件路徑
private ArrayList paths = null;
//參數初始化
public MyAdapter(Context context, ArrayList na, ArrayList 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);
}
}
四、添加權限
五、實現效果圖
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