Android 实现 选择文件对话框
16lz
2021-01-23
// filename: CallbackBundle.java package com.example.openfiledemo; import android.os.Bundle; // 简单的Bundle参数回调接口 public interface CallbackBundle { abstract void callback(Bundle bundle); } 然后对打开文件对话框的封装：
// filename: OpenFileDialog.javapackage com.example.openfiledemo;import java.io.File;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.Context;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.Toast;import android.widget.AdapterView.OnItemClickListener;public class OpenFileDialog {public static String tag = "OpenFileDialog";static final public String sRoot = "/"; static final public String sParent = "..";static final public String sFolder = ".";static final public String sEmpty = "";static final private String sOnErrorMsg = "No rights to access!";// 参数说明// context:上下文// dialogid:对话框ID// title:对话框标题// callback:一个传递Bundle参数的回调接口// suffix:需要选择的文件后缀，比如需要选择wav、mp3文件的时候设置为".wav;.mp3;"，注意最后需要一个分号(;)// images:用来根据后缀显示的图标资源ID。//根目录图标的索引为sRoot;//父目录的索引为sParent;//文件夹的索引为sFolder;//默认图标的索引为sEmpty;//其他的直接根据后缀进行索引，比如.wav文件图标的索引为"wav"public static Dialog createDialog(int id, Context context, String title, CallbackBundle callback, String suffix, Map<String, Integer> images){AlertDialog.Builder builder = new AlertDialog.Builder(context);builder.setView(new FileSelectView(context, id, callback, suffix, images));Dialog dialog = builder.create();//dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);dialog.setTitle(title);return dialog;}static class FileSelectView extends ListView implements OnItemClickListener{private CallbackBundle callback = null;private String path = sRoot;private List<Map<String, Object>> list = null;private int dialogid = 0;private String suffix = null;private Map<String, Integer> imagemap = null;public FileSelectView(Context context, int dialogid, CallbackBundle callback, String suffix, Map<String, Integer> images) {super(context);this.imagemap = images;this.suffix = suffix==null?"":suffix.toLowerCase();this.callback = callback;this.dialogid = dialogid;this.setOnItemClickListener(this);refreshFileList();}private String getSuffix(String filename){int dix = filename.lastIndexOf('.');if(dix<0){return "";}else{return filename.substring(dix+1);}}private int getImageId(String s){if(imagemap == null){return 0;}else if(imagemap.containsKey(s)){return imagemap.get(s);}else if(imagemap.containsKey(sEmpty)){return imagemap.get(sEmpty);}else {return 0;}}private int refreshFileList(){// 刷新文件列表File[] files = null;try{files = new File(path).listFiles();}catch(Exception e){files = null;}if(files==null){// 访问出错Toast.makeText(getContext(), sOnErrorMsg,Toast.LENGTH_SHORT).show();return -1;}if(list != null){list.clear();}else{list = new ArrayList<Map<String, Object>>(files.length);}// 用来先保存文件夹和文件夹的两个列表ArrayList<Map<String, Object>> lfolders = new ArrayList<Map<String, Object>>();ArrayList<Map<String, Object>> lfiles = new ArrayList<Map<String, Object>>();if(!this.path.equals(sRoot)){// 添加根目录 和 上一层目录Map<String, Object> map = new HashMap<String, Object>();map.put("name", sRoot);map.put("path", sRoot);map.put("img", getImageId(sRoot));list.add(map);map = new HashMap<String, Object>();map.put("name", sParent);map.put("path", path);map.put("img", getImageId(sParent));list.add(map);}for(File file: files){if(file.isDirectory() && file.listFiles()!=null){// 添加文件夹Map<String, Object> map = new HashMap<String, Object>();map.put("name", file.getName());map.put("path", file.getPath());map.put("img", getImageId(sFolder));lfolders.add(map);}else if(file.isFile()){// 添加文件String sf = getSuffix(file.getName()).toLowerCase();if(suffix == null || suffix.length()==0 || (sf.length()>0 && suffix.indexOf("."+sf+";")>=0)){Map<String, Object> map = new HashMap<String, Object>();map.put("name", file.getName());map.put("path", file.getPath());map.put("img", getImageId(sf));lfiles.add(map);}} }list.addAll(lfolders); // 先添加文件夹，确保文件夹显示在上面list.addAll(lfiles);//再添加文件SimpleAdapter adapter = new SimpleAdapter(getContext(), list, R.layout.filedialogitem, new String[]{"img", "name", "path"}, new int[]{R.id.filedialogitem_img, R.id.filedialogitem_name, R.id.filedialogitem_path});this.setAdapter(adapter);return files.length;}@Overridepublic void onItemClick(AdapterView<?> parent, View v, int position, long id) {// 条目选择String pt = (String) list.get(position).get("path");String fn = (String) list.get(position).get("name");if(fn.equals(sRoot) || fn.equals(sParent)){// 如果是更目录或者上一层File fl = new File(pt);String ppt = fl.getParent();if(ppt != null){// 返回上一层path = ppt;}else{// 返回更目录path = sRoot;}}else{File fl = new File(pt);if(fl.isFile()){// 如果是文件((Activity)getContext()).dismissDialog(this.dialogid); // 让文件夹对话框消失// 设置回调的返回值Bundle bundle = new Bundle();bundle.putString("path", pt);bundle.putString("name", fn);// 调用事先设置的回调函数this.callback.callback(bundle);return;}else if(fl.isDirectory()){// 如果是文件夹// 那么进入选中的文件夹path = pt;}}this.refreshFileList();}}} <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/vw1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#000000" android:orientation="horizontal" android:padding="4dp" > <ImageView android:id="@+id/filedialogitem_img" android:layout_width="32dp" android:layout_height="32dp" android:layout_margin="4dp"/> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/filedialogitem_name" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textColor="#FFFFFF" android:textSize="18sp" android:textStyle="bold" /> <TextView android:id="@+id/filedialogitem_path" android:layout_width="fill_parent" android:layout_height="wrap_content" android:paddingLeft="10dp" android:textColor="#FFFFFF" android:textSize="14sp" /> </LinearLayout> </LinearLayout>
下面是使用的例子：
// filename: OpenFileDemo.java package com.example.openfiledemo; import java.util.HashMap; import java.util.Map; import android.os.Bundle; import android.app.Activity; import android.app.Dialog; import android.view.View; import android.view.View.OnClickListener; public class OpenFileDemo extends Activity { static private int openfileDialogId = 0; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_open_file_demo); // 设置单击按钮时打开文件对话框 findViewById(R.id.button_openfile).setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { showDialog(openfileDialogId); } }); } @Override protected Dialog onCreateDialog(int id) { if(id==openfileDialogId){ Map<String, Integer> images = new HashMap<String, Integer>(); // 下面几句设置各文件类型的图标， 需要你先把图标添加到资源文件夹 images.put(OpenFileDialog.sRoot, R.drawable.filedialog_root); // 根目录图标 images.put(OpenFileDialog.sParent, R.drawable.filedialog_folder_up); //返回上一层的图标 images.put(OpenFileDialog.sFolder, R.drawable.filedialog_folder); //文件夹图标 images.put("wav", R.drawable.filedialog_wavfile); //wav文件图标 images.put(OpenFileDialog.sEmpty, R.drawable.filedialog_root); Dialog dialog = OpenFileDialog.createDialog(id, this, "打开文件", new CallbackBundle() { @Override public void callback(Bundle bundle) { String filepath = bundle.getString("path"); setTitle(filepath); // 把文件路径显示在标题上 } }, ".wav;", images); return dialog; } return null; } } 工程可在我的百度网盘下载，开源Android
放两张效果图：
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