我有一个由天组成的应用程序listview每天都有它的特定图像放置在一个无限的画廊类,我想做的是:
从应用程序可绘制资源(无限图库类)中保存带有序号的图像到sd卡,
我试图得到保存图像的顺序编号如下:
第一张图片:image -1.png .
第二张图片:image -2.png .
第三张图片:image -3.png,
,以此类推。
with using:
Random generator = new Random();
这会导致:
第一期:以随机数保存图片。
第二个问题:它不是保存所有的图像是由用户选择保存到sd卡,它保存一些图像两次或三次
这是与保存图像相关的代码部分:
View vi=convertView;
final ViewHolder holder;
if(convertView==null){
vi = inflater.inflate(R.layout.gallery_items, null);
holder=new ViewHolder();
holder.text=(TextView)vi.findViewById(R.id.textView1);
holder.image=(ImageView)vi.findViewById(R.id.image);
holder.button=(Button)vi.findViewById(R.id.button_save);
bm = BitmapFactory.decodeResource( mContext.getResources(), images[itemPos]);
holder.image.setImageBitmap(bm);
holder.button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
String root = Environment.getExternalStorageDirectory().toString();
File imagesFolder = new File(root + "/Days pictures");
imagesFolder.mkdirs();
Random generator = new Random();
int n = 1000;
n = generator.nextInt(n);
String fname = "Image-"+ n +".png";
File file = new File (imagesFolder, fname);
if (file.exists ())
file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
bm.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
Toast.makeText(mContext, "Saved", Toast.LENGTH_LONG).show();}
catch (Exception e) {
e.printStackTrace();
Toast.makeText(mContext, e.toString(), Toast.LENGTH_SHORT).show();}}});
vi.setTag(holder);}
else holder=(ViewHolder)vi.getTag();
holder.text.setText(name[itemPos]);
final int stub_id=images[itemPos];
holder.image.setImageResource(stub_id);
return vi; }
private ImageView getImageView() {
ImageView i = new ImageView(mContext);
return i; } }
谢谢你的帮助。
从您的问题和评论中我可以理解您想要保存n张图像到SDCard。
按以下步骤保存
步骤1:获取所需的所有图像。确保你在这里得到了正确的图像列表。
步骤2:计算列表中的图像数量并将其存储在变量
中 int numberOfImages = 15;// Get it dynamically
步骤3:现在循环它以按顺序存储所有图像
//Create Directory to store images in SDCard
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_images");
if(!myDir.exists()){
myDir.mkdirs();
}
// You have to get next image here from the resource here
bm = BitmapFactory.decodeResource( mContext.getResources(), images[i]);// value for itemPos should be given here.
// Get Last Saved Number
SharedPreferences savedNumber = getSharedPreferences(PREFS_NAME, 0);
int lastSavedNumber = savedNumber.getInt("lastsavednumber",0);
lastSavedNumber++;
String fname = "Image-"+lastSavedNumber+".png";
File file = new File (myDir, fname);
if (file.exists ()) {file.delete (); }
try {
FileOutputStream out = new FileOutputStream(file);
bm.compress(Bitmap.CompressFormat.JPEG, 90, out);//Your Bitmap from the resouce
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
//To Store the last Number
SharedPreferences saveNumber = getApplicationContext().getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editorset = saveNumber.edit();
editorset.putInt("lastsavednumber",lastSavedNumber);
editorset.commit();
如果在第一步中做错了什么,就会发生重复。
编辑要按顺序存储所有图像,请使用SharedPreferences来存储最后保存的图像编号。
public static final String PREFS_NAME = "ImageNumber";
// Get Last Saved Number
SharedPreferences savedNumber = getSharedPreferences(PREFS_NAME, 0);
int lastSavedNumber = savedNumber.getInt("lastsavednumber",0);
lastSavedNumber++;
String fname = "Image-"+lastSavedNumber+".png";
//To Store Last Saved Number
SharedPreferences saveNumber = getApplicationContext().getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editorset = saveNumber.edit();
editorset.putInt("lastsavednumber",lastSavedNumber);
editorset.commit();
直接使用for
循环。如果你想在SD卡上保存多少图像,那么
for(int n=1 ; n <= size ; n++){
String fname = "Image-"+ n +".png";
// you other stuff here
}
原谅随机,如果您希望图像按顺序排列(如Pragnani所建议的,并且您批准了上面的评论),并且假设您的代码没问题,请这样做:
Override
public void onClick(View arg0) {
String root = Environment.getExternalStorageDirectory().toString();
File imagesFolder = new File(root + "/imagesFolder");
imagesFolder.mkdirs();
for (int i = 0; i < 10; i++) {
String fname = "Image-" + i + ".png";
File file = new File (imagesFolder, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
bm.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
Toast.makeText(MainActivity.this, "Saved", Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_SHORT).show();
}
}
}
测试后告诉我