Android(安卓)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();
}
};
}

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