我创建了一个应用。当我点击特定图像时，我希望它在下一页的全屏显示。
当我点击任何图像时，它们看起来非常模糊和像素化。
请有人帮助我。
这是我的代码及其link
package com.shranick.clubinthechi;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import android.app.Dialog;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.drawable.BitmapDrawable;
import android.os.Environment;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Display;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.Gallery.LayoutParams;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.listener.SimpleImageLoadingListener;
public class EventDetailCoverflow {
Context mContext;
public CoverFlow coverFlow;
ImageAdapter coverImageAdapter;
DisplayImageOptions options;
int selectedItem = -1;
ImageView selectedImage;
OutputStream fOut = null;
File f;
ArrayList imageToSave = new ArrayList();
ArrayList loaded = new ArrayList();
/** Called when the activity is first created. */
public EventDetailCoverflow(Context context, int scrollToIndex, TCImageLoader loader)
{
mContext = context;
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.flyer_placeholder)
.showImageForEmptyUri(R.drawable.flyer_placeholder)
.imageScaleType(ImageScaleType.EXACTLY)
.cacheInMemory(true)
.build();
coverFlow = new CoverFlow(context);
coverImageAdapter = new ImageAdapter(mContext);
coverFlow.setAdapter(coverImageAdapter);
coverFlow.setSpacing(-25);
// coverFlow.setSelection(scrollToIndex, true);
coverFlow.setAnimationDuration(1000);
coverFlow.setGravity(Gravity.CENTER_VERTICAL);
coverFlow.setLayoutParams(new CoverFlow.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
// GET SCREEN SIZE
WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
DisplayMetrics dm = new DisplayMetrics();
display.getMetrics(dm);
coverImageAdapter.coverflowWidth = (int) Math.ceil(dm.widthPixels * (dm.densityDpi / 160.0));
coverImageAdapter.coverflowHeight = (int) Math.ceil(dm.heightPixels * (dm.densityDpi / 160.0)) / 2;
coverFlow.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View view, int position, long id){
selectedItem = position;
selectedImage = (ImageView) view;
// custom dialog
final Dialog dialog = new Dialog(mContext);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.eventdetail_dialog);
ImageButton favBtn = (ImageButton) dialog.findViewById(R.id.favo);
favBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
if(DataContainer.sharedManager().favoriteEvents == null)
DataContainer.sharedManager().getSavedFavoriteEvents(mContext);
DataContainer.sharedManager().saveToFavoriteEvents(DataContainer.sharedManager().eventItemsList.get(selectedItem), mContext);
}
});
ImageButton saveBtn = (ImageButton) dialog.findViewById(R.id.save);
saveBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
if(loaded.get(selectedItem) == true)
{
String strDirectory = Environment.getExternalStorageDirectory().toString();
f = null;
// f = new File(strDirectory, generateRandomName());
f = new File(strDirectory, "");
try {
fOut = new FileOutputStream(f);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
Log.e("MSG", "exception with fout start", e1);
}
/**Compress image**/
Bitmap bmp = ((BitmapDrawable)selectedImage.getDrawable()).getBitmap();
bmp.compress(Bitmap.CompressFormat.PNG, 85, fOut);
try {
fOut.flush();
fOut.close();
Log.i("MSG","reached till fout");
} catch (IOException e) {
e.printStackTrace();
Log.e("MSG", "exception with fout", e);
}
MainActivity.instance.displayToastWithText("Image saved successfully");
}
else
{
MainActivity.instance.displayToastWithText("Wait, Image has not been loaded.");
if(!imageToSave.contains(selectedItem))
{
imageToSave.add(selectedItem);
}
}
}
});
dialog.show();
}
});
}
String generateRandomName()
{
String text = "";
String possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
for( int i=0; i < 5; i++ )
text += possible.charAt((int)Math.floor(Math.random() * possible.length()));
return text;
}
public void reloadCoverflow()
{
coverImageAdapter.notifyDataSetChanged();
}
public class ImageAdapter extends BaseAdapter {
int mGalleryItemBackground;
public int coverflowHeight, coverflowWidth;
private Context mContext;
public ImageAdapter(Context c) {
mContext = c;
for(int i = 0 ; i < DataContainer.sharedManager().eventItemsList.size(); i++)
{
loaded.add(false);
}
}
public int getCount() {
return DataContainer.sharedManager().eventItemsList.size();
}
public Object getItem(int position) {
return DataContainer.sharedManager().eventItemsList.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView img = new ImageView(mContext);
img.setLayoutParams(new Gallery.LayoutParams(coverflowWidth, coverflowHeight));
img.setScaleType(ScaleType.CENTER_INSIDE);
img.setTag(position);
EventItem data = (EventItem) getItem(position);
ImageLoader.getInstance().displayImage(data.imageURL, img, options, new SimpleImageLoadingListener()
{
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
ImageView image = (ImageView) view;
Log.i("MSG", "loading complete in view");
image.setImageBitmap(loadedImage);
int pos = Integer.parseInt(image.getTag().toString());
loaded.set(pos, true);
if(imageToSave.contains(image.getTag()))//means save it
{
String strDirectory = Environment.getExternalStorageDirectory().toString();
f = null;
f = new File(strDirectory, generateRandomName());
try {
fOut = new FileOutputStream(f);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
Log.e("MSG", "exception with fout start", e1);
}
/**Compress image**/
Bitmap bmp = ((BitmapDrawable)image.getDrawable()).getBitmap();
bmp.compress(Bitmap.CompressFormat.PNG, 85, fOut);
try {
fOut.flush();
fOut.close();
Log.i("MSG","reached till fout");
} catch (IOException e) {
e.printStackTrace();
Log.e("MSG", "exception with fout", e);
}
imageToSave.remove(image.getTag());
MainActivity.instance.displayToastWithText("Image saved successfully");
}
else
{
EventItem _data = (EventItem) getItem(Integer.parseInt(image.getTag().toString()));
ImageLoader.getInstance().displayImage(_data.imageURL, image, options, null);
}
}
});
return img;
}
/** Returns the size (0.0f to 1.0f) of the views
* depending on the 'offset' to the center. */
public float getScale(boolean focused, int offset) {
/* Formula: 1 / (2 ^ offset) */
return Math.max(0, 1.0f / (float)Math.pow(2, Math.abs(offset)));
}
public Bitmap getBitmapFromView(View view, int index) {
//Define a bitmap with the same size as the view
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888);
//Bind a canvas to it
Canvas canvas = new Canvas(returnedBitmap);
canvas.drawColor(Color.LTGRAY);
//draw text
FeaturedFlyerData data = (FeaturedFlyerData) getItem(index);
// paint to write text with
Paint paint = new Paint();
paint.setStyle(Style.FILL);
paint.setColor(Color.BLACK);
paint.setAntiAlias(true);
paint.setTypeface(Typeface.DEFAULT_BOLD);
paint.setTextSize(20);
// min. rect of text
Rect textBounds = new Rect();
paint.getTextBounds(data.name, 0, data.name.length(), textBounds);
canvas.drawText(data.name, 15, 10, paint);
paint.setTypeface(Typeface.SANS_SERIF);
paint.setTextSize(14);
canvas.drawText(data.location, 15, 40, paint);
canvas.drawText(data.area, 15, 70, paint);
canvas.drawText(data.info, 15, 100, paint);
// draw the view on the canvas
view.draw(canvas);
//return the bitmap
return returnedBitmap;
}
}
}
请有人帮助我
答案 0 :(得分：0)
你必须保持两个小图像一个小而另一个大屏幕尺寸
答案 1 :(得分：0)
没有编码部分，问题很容易看出。
扩展图像（由此我谈论将图像扩展到超出它的默认宽度和高度）将始终看起来模糊和像素化，因为它不是要扩展，只是矢量化图像可以做到这一点。
您必须找到一个技巧，使用非常大的图像并将其调整到所需的分辨率或使用矢量化图像。
答案 2 :(得分：0)