产品需求：
微信分享多图至好友，朋友圈。由于微信禁用了分享9图至朋友圈功能，这里分享微信只是将图片保存至本地，具体让用户手动分享。
问题分析：
微信没有提供分享多图的SDK，因此我们实现调用系统自带的分享功能。将分享的图片保存至本地，再调用系统本地的分享实现分享多图操作。
具体实现：
这里保存图片实现用了两种方式：
- 使用网络请求下载图片。
- 使用Glide加载图片。
2.1 将请求网络的图片转化成bitmap，再将bitmap图片保存至本地相册。
2.2 获取缓存至本地的文件，再将文件保存至指定目录，更新相册。
注意：保存图片至系统相册目录时，只能在主线程实现。推断里面使用了IO流的原因。
一、分享多图至微信
AtomicInteger count = new AtomicInteger();
ArrayList<Observable<File>> observables = new ArrayList<>();
List<Uri> imageUris = new ArrayList<Uri>();
mCommitDialog = WeiboDialogUtils.createLoadingDialog(this, "正在加载...");
observables.add(Observable.fromIterable(imageList).flatMap(new Function<String, ObservableSource<File>>() {
@Override
public ObservableSource<File> apply(String imagePath) throws Exception {
return Observable.create(new ObservableOnSubscribe<File>() {
@Override
public void subscribe(ObservableEmitter<File> emitter) throws Exception {
File file = PhotoUtils.saveImageToSdCard(getActivity(), imagePath);
emitter.onNext(file);
}
});
}
}).subscribeOn(Schedulers.io())); Observable.merge(observables).map(new Function<File, Boolean>() {
@Override
public Boolean apply(File f) throws Exception {
File file = new File(f.getAbsolutePath());
if(file.exists()) {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {//android 7.0以下
imageUris.add(Uri.fromFile(file));
} else {//android 7.0及以上
Uri uri = Uri.parse(android.provider.MediaStore.Images.Media.insertImage(getContentResolver(), file.getAbsolutePath(), file.getName(), null));
imageUris.add(uri);
}
return true;
}
return false;
}}).observeOn(AndroidSchedulers.mainThread())
.subscribe(new Consumer<Boolean>() {
@Override
public void accept(Boolean a) throws Exception {
if(a) count.addAndGet(1);
if(imageList.size() == count.get()){
mCommitDialog.dismiss();
// showMessage(R.string.text_share_success );
//分享到微信好友
Intent intent = new Intent();
ComponentName componentName = new ComponentName("com.tencent.mm", "com.tencent.mm.ui.tools.ShareImgUI");
if (imageUris.size() == 0) return;
intent.setComponent(componentName);
intent.setAction(Intent.ACTION_SEND_MULTIPLE);
intent.setType("image/*");
intent.putExtra(Intent.EXTRA_STREAM, (Serializable) imageUris);
startActivity(intent);
} }
}, new Consumer<Throwable>() {
@Override
public void accept(Throwable throwable) throws Exception {
mCommitDialog.dismiss();
showMessage(R.string.text_save_failed);
}
}, new Action() {
@Override
public void run() throws Exception { }
})
;
saveImageToSdCard方法如下。
//根据网络图片url路径保存到本地
public static final File saveImageToSdCard(Context context, String image) {
boolean success = false;
File file = null;
try {
file = createStableImageFile(context);
Bitmap bitmap = null;
URL url = new URL(image);
HttpURLConnection conn = null;
conn = (HttpURLConnection) url.openConnection();
InputStream is = null;
is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
FileOutputStream outStream;
outStream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream);
outStream.flush();
outStream.close();
success = true;
} catch (Exception e) {
e.printStackTrace();
} if (success) {
return file;
} else {
return null;
}
}
二、保存多图至本地。
1.Glide加载图片生成Bitmap对象。
AtomicInteger count = new AtomicInteger();
ArrayList<Observable<Boolean>> observables = new ArrayList<>();
for (String imagePath :
imageList) {
observables.add(Observable.create(new ObservableOnSubscribe<Boolean>() {
@Override
public void subscribe(ObservableEmitter<Boolean> emitter) throws Exception {
SimpleTarget<Bitmap> into = Glide.with(getActivity())
.asBitmap()
.load(imagePath)
.into(new SimpleTarget<Bitmap>() {
@Override
public void onResourceReady( Bitmap bitmap, @Nullable Transition<? super Bitmap> transition) {
if (bitmap != null) {
//图片信息不为空时才保存
emitter.onNext( PhotoUtils.savePhoto(getActivity(), DateUtils.formatDate(getActivity(),
System.currentTimeMillis()) + UUID.randomUUID() + ".png", bitmap));
}
}
});
}
}).subscribeOn(AndroidSchedulers.mainThread()));}
Observable.merge(observables).observeOn(AndroidSchedulers.mainThread())
.subscribe(new Consumer<Boolean>() {
@Override
public void accept(Boolean b) throws Exception {
if (b) {
count.addAndGet(1);
}
if(imageList.size() == count.get()){
showHintDialog();
// showMessage(R.string.text_save_pic_success );
} }
}, new Consumer<Throwable>() {
@Override
public void accept(Throwable throwable) throws Exception {
showMessage(R.string.text_save_pic_failed);
}
}, new Action() {
@Override
public void run() throws Exception { }
});
2.Glide加载图片，得到文件形式。
File file = Glide.with(context)
.load(images[i])
.downloadOnly(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL)
.get()
savePhoto方法如下：
/**
* 保存图片
*/
public static boolean savePhoto(Context context, String fileName, Bitmap bitmap) {
//系统相册目录
String galleryPath = Environment.getExternalStorageDirectory()
+ File.separator + Environment.DIRECTORY_DCIM
+ File.separator + "Camera" + File.separator;
File imagePath = new File(galleryPath);
if (!imagePath.exists()) {
imagePath.mkdirs();
}
File fileUri = new File(imagePath + File.separator + fileName);
if (!fileUri.exists()) {
try {
fileUri.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
Uri imgUri = Uri.fromFile(fileUri); try {
FileOutputStream out = new FileOutputStream(fileUri);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
intent.setData(imgUri);
context.sendBroadcast(intent);
return true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} return false;
}
注意：这里要申请权限。
参考博客：