在我的应用程序中,我想将SD卡中的图像放到特定位置,我需要在图库中显示,
我使用的代码是附加
private Gallery gallery;
private ImageView imgView;
int position;
private byte[] data = { };
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gridview);
try{
String filepath = "/sdcard/data/Crak/";
File imagefile = new File(filepath +"abcd.jpg" );
FileInputStream fis = new FileInputStream(imagefile);
Bitmap bi = BitmapFactory.decodeStream(fis);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bi.compress(Bitmap.CompressFormat.JPEG, 100, baos);
data = baos.toByteArray();
System.out.println("cnvrtn");
}
catch(Exception e) {
e.printStackTrace();
}
final Bitmap bitmapimage = BitmapFactory.decodeByteArray(data, 0, data.length);
position = 0;
imgView = (ImageView) findViewById(R.id.ImageView01);
imgView.setImageBitmap(bitmapimage);
gallery = (Gallery) findViewById(R.id.examplegallery);
gallery.setAdapter(new AddImgAdp(this));
gallery.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position,
long id) {
imgView.setImageBitmap(bitmapimage);
DisplayImage.this.position = position;
}
});
System.out.println("Enter the activity//////////");
imgView.setOnClickListener(new View.OnClickListener() {
@SuppressWarnings("deprecation")
@Override
public void onClick(View paramView) {
// TODO Auto-generated method stub
}
});
}
public class AddImgAdp extends BaseAdapter {
int GalItemBg;
private Context cont;
@SuppressWarnings("null")
public AddImgAdp(Context c) {
cont = c;
TypedArray typArray = obtainStyledAttributes(R.styleable.GalleryTheme);
GalItemBg = typArray.getResourceId(
R.styleable.GalleryTheme_android_galleryItemBackground, 0);
typArray.recycle();
}
public int getCount() {
return data.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imgView = new ImageView(cont);
final Bitmap bitmapimage = BitmapFactory.decodeByteArray(data, 0, data.length);
imgView.setImageBitmap(bitmapimage);;
imgView.setLayoutParams(new Gallery.LayoutParams(100, 100));
imgView.setScaleType(ImageView.ScaleType.FIT_XY);
imgView.setBackgroundResource(GalItemBg);
return imgView;
}
}
问题是
1)如何获取SD卡中特定文件夹中的所有图像
2)GalleryView是无限的,或者是一个没有结尾的长视频
答案 0 :(得分:6)
这是从特定路径获取图片的更新代码...
package com.example.gall;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import com.example.gall.R;
import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;
public class gall extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Gallery g = (Gallery) findViewById(R.id.gallery);
g.setAdapter(new ImageAdapter(this, ReadSDCard()));
g.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent,
View v, int position, long id) {
}
});
}
private List<String> ReadSDCard()
{
List<String> tFileList = new ArrayList<String>();
//It have to be matched with the directory in SDCard
File f = new File("/android/sdcard2/");
File[] files=f.listFiles();
for(int i=0; i<files.length; i++)
{
File file = files[i];
/*It's assumed that all file in the path are in supported type*/
tFileList.add(file.getPath());
}
return tFileList;
}
public class ImageAdapter extends BaseAdapter {
int mGalleryItemBackground;
private Context mContext;
private List<String> FileList;
public ImageAdapter(Context c, List<String> fList) {
mContext = c;
FileList = fList;
TypedArray a = obtainStyledAttributes(R.styleable.gall);
mGalleryItemBackground = a.getResourceId(
R.styleable.gall_android_galleryItemBackground,0);
a.recycle();
}
public int getCount() {
return FileList.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView,
ViewGroup parent) {
ImageView i = new ImageView(mContext);
Bitmap bm = BitmapFactory.decodeFile(
FileList.get(position).toString());
i.setImageBitmap(bm);
i.setLayoutParams(new Gallery.LayoutParams(150, 100));
i.setScaleType(ImageView.ScaleType.FIT_XY);
i.setBackgroundResource(mGalleryItemBackground);
return i;
}
}
public TypedArray obtainStyledAttributes(int theme) {
// TODO Auto-generated method stub
return null;
}
}
答案 1 :(得分:0)
获取所有图像将导致内存溢出,最好的方法是以字符串形式保留路径列表并将其提供给库。如果要创建自定义库,则必须创建位图并对其进行垃圾收集。
这是访问SD卡的好方法:
String path = Environment.getExternalStorageDirectory().getPath()+ "/yourFolder/"
这是如何获取列表
File directory = new File(path);
if(directory.isDirectory)
{
if(directory.list().length > 0 /*&& check if its an img etc*/)
{
for(String s: directory.list())
{
Log.d(TAG, "adding " + s);
fileNames.add(s);
}
}
}
你应该确保检查sd-card已加载
答案 2 :(得分:0)
//YOUR CODE HERE...
String[] projection = new String[]{
MediaStore.Images.Media._ID,
MediaStore.Images.Media.DATA, // add DATA column
MediaStore.Images.Media.BUCKET_DISPLAY_NAME,
MediaStore.Images.Media.DATE_TAKEN,
MediaStore.Images.Media.TITLE,
};
// Get the base URI for the People table in the Contacts content provider.
Uri images = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
Log.i("URI", images.toString());
// Make the query.
Cursor cur = managedQuery(
MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
projection, // Which columns to return
null, // Which rows to return (all rows)
null, // Selection arguments (none)
MediaStore.Images.Thumbnails.IMAGE_ID // Ordering
);
Log.i("ListingImages"," query count="+cur.getCount());
if (cur.moveToFirst()) {
String bucket;
String date;
String name;
int bucketColumn = cur.getColumnIndex(
MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
int dateColumn = cur.getColumnIndex(
MediaStore.Images.Media.DATE_TAKEN);
int nameColumn = cur.getColumnIndex(
MediaStore.Images.Media.TITLE);
// Get the field values
bucket = cur.getString(bucketColumn);
date = cur.getString(dateColumn);
name = cur.getString(nameColumn);
int columnIndex = cur.getColumnIndex(MediaStore.Images.Media.DATA);
String picPath = cur.getString(columnIndex);
imageView.setImageBitmap(BitmapFactory.decodeFile(picPath));
// Do something with the values.
Log.i("ListingImages", " bucket=" + bucket
+ " name_taken=" + name);
}
}