Android File Explorer 展示图片

res/layout/row.xml

 

<?xml version="1.0" encoding="utf-8"?>
<TextView
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/rowtext"
  android:layout_width="fill_parent"
     android:layout_height="25px"
     android:textSize="23sp" />

 

/res/layout/main.xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
 android:id="@+id/path"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<ListView
 android:id="@android:id/list"
 android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
 />
<TextView
 android:id="@android:id/empty"
 android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="No Data"
 />
</LinearLayout>

/res/layout/jpgdialog.xml

 

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/layout_root"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:paddingLeft="10dip"
              android:paddingRight="10dip"
              >
    <TextView android:id="@+id/text"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:textSize="11sp" />
              />
    <ImageView android:id="@+id/image"
               android:layout_width="150px"
               android:layout_height="150px"
               />
    <Button android:id="@+id/okdialogbutton"
        android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:text="OK"
        />
</LinearLayout>

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.ExifInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class AndroidExplorer extends ListActivity {

static final int ID_JPGDIALOG = 0;

String filename;
String exifAttribute;
TextView exifText;
ImageView bmImage;
BitmapFactory.Options bmOptions;
File jpgFile;
Dialog jpgDialog;

private List<String> item = null;
private List<String> path = null;
private String root="/";
private TextView myPath;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myPath = (TextView)findViewById(R.id.path);
        getDir(root);
    }
   
    private void getDir(String dirPath)
    {
     myPath.setText("Location: " + dirPath);
    
     item = new ArrayList<String>();
     path = new ArrayList<String>();
    
     File f = new File(dirPath);
     File[] files = f.listFiles();
    
     if(!dirPath.equals(root))
     {

      item.add(root);
      path.add(root);
     
      item.add("../");
      path.add(f.getParent());
           
     }
    
     for(int i=0; i < files.length; i++)
     {
       File file = files[i];
       path.add(file.getPath());
       if(file.isDirectory())
        item.add(file.getName() + "/");
       else
        item.add(file.getName());
     }

     ArrayAdapter<String> fileList =
      new ArrayAdapter<String>(this, R.layout.row, item);
     setListAdapter(fileList);
    }

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
 
  File file = new File(path.get(position));
 
  if (file.isDirectory())
  {
   if(file.canRead())
    getDir(path.get(position));
   else
   {
    new AlertDialog.Builder(this)
    .setIcon(R.drawable.icon)
    .setTitle("[" + file.getName() + "] folder can't be read!")
    .setPositiveButton("OK",
      new DialogInterface.OnClickListener() {
      
       @Override
       public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub
       }
      }).show();
   }
  }
  else
  {
   exifAttribute = null;
   filename = file.getName();
   String ext = filename.substring(filename.lastIndexOf('.')+1, filename.length());

   if(ext.equals("JPG")||ext.equals("jpg"))
   {
    try {
     ExifInterface exif = new ExifInterface(file.toString());
     exifAttribute = getExif(exif);
    } catch (IOException e) {
     // TODO Auto-generated catch block
     ;
    }
    jpgFile = file;
    showDialog(ID_JPGDIALOG);
   }
   else{
    new AlertDialog.Builder(this)
       .setIcon(R.drawable.icon)
       .setTitle("[" + filename + "]")
       .setMessage(exifAttribute)
       .setPositiveButton("OK",
         new DialogInterface.OnClickListener() {
         
          @Override
          public void onClick(DialogInterface dialog, int which) {
           // TODO Auto-generated method stub
          }
         }).show();
   }
  }
}

    private String getExif(ExifInterface exif)
    {
     String myAttribute=null;
     myAttribute += getTagString(ExifInterface.TAG_DATETIME, exif);
     myAttribute += getTagString(ExifInterface.TAG_FLASH, exif);
     myAttribute += getTagString(ExifInterface.TAG_GPS_LATITUDE, exif);
     myAttribute += getTagString(ExifInterface.TAG_GPS_LATITUDE_REF, exif);
     myAttribute += getTagString(ExifInterface.TAG_GPS_LONGITUDE, exif);
     myAttribute += getTagString(ExifInterface.TAG_GPS_LONGITUDE_REF, exif);
     myAttribute += getTagString(ExifInterface.TAG_IMAGE_LENGTH, exif);
     myAttribute += getTagString(ExifInterface.TAG_IMAGE_WIDTH, exif);
     myAttribute += getTagString(ExifInterface.TAG_MAKE, exif);
     myAttribute += getTagString(ExifInterface.TAG_MODEL, exif);
     myAttribute += getTagString(ExifInterface.TAG_ORIENTATION, exif);
     myAttribute += getTagString(ExifInterface.TAG_WHITE_BALANCE, exif);
     return myAttribute;
    }
   
    private String getTagString(String tag, ExifInterface exif)
    {
     return(tag + " : " + exif.getAttribute(tag) + "\n");
    }

@Override
protected Dialog onCreateDialog(int id) {
  jpgDialog = null;;
  switch(id){
  case ID_JPGDIALOG:

   Context mContext = this;
   jpgDialog = new Dialog(mContext);

   jpgDialog.setContentView(R.layout.jpgdialog);
   exifText = (TextView) jpgDialog.findViewById(R.id.text);
   bmImage = (ImageView)jpgDialog.findViewById(R.id.image);
   bmOptions = new BitmapFactory.Options();
   bmOptions.inSampleSize = 2;
  
   Button okDialogButton = (Button)jpgDialog.findViewById(R.id.okdialogbutton);
   okDialogButton.setOnClickListener(okDialogButtonOnClickListener);
  
   break;
  default:
   break;
  }
  return jpgDialog;
}

@Override
protected void onPrepareDialog(int id, Dialog dialog) {
  // TODO Auto-generated method stub

  switch(id){
  case ID_JPGDIALOG:
   dialog.setTitle("[" + filename + "]");
   exifText.setText(exifAttribute);
   Bitmap bm = BitmapFactory.decodeFile(jpgFile.getPath(), bmOptions);
   bmImage.setImageBitmap(bm);
  
   break;
  default:
   break;
  }
}
   
private Button.OnClickListener okDialogButtonOnClickListener
  = new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    jpgDialog.dismiss();
   }
};
}