使用外部图像 url 的 Android 意图共享
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原文地址: http://stackoverflow.com/questions/26301170/
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Android Intent Share using external image url
提问by user2799221
I couldn't help noticing that all examples of sharing images with Intent use locally stored files. Whenever I try to use a external url, facebook, twitter etc. gives me a toast saying "One or more media items could be not be added".
我不禁注意到所有与 Intent 共享图像的示例都使用本地存储的文件。每当我尝试使用外部 url 时，facebook、twitter 等都会给我一个敬酒说“不能添加一个或多个媒体项目”。
Do i have to store a copy of the image locally?If yes, how do i do that?
我必须在本地存储图像的副本吗？如果是，我该怎么做？
回答by Vishnudev K
Thank you @user2245247 for the link
It contains the correct answer to share image from remote url.
Use external library
谢谢@user2245247 提供的链接
它包含从远程 url 共享图像的正确答案。
使用外部库
// Get access to ImageView
ImageView ivImage = (ImageView) findViewById(R.id.ivResult);
// Fire async request to load image
Picasso.with(context).load(imageUrl).into(ivImage);
After the image loaded successfully to the image view, trigger the method for sharing intent.
图像加载成功到图像视图后，触发分享意图的方法。
// Can be triggered by a view event such as a button press
public void onShareItem(View v) {
// Get access to bitmap image from view
ImageView ivImage = (ImageView) findViewById(R.id.ivResult);
// Get access to the URI for the bitmap
Uri bmpUri = getLocalBitmapUri(ivImage);
if (bmpUri != null) {
// Construct a ShareIntent with link to image
Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.putExtra(Intent.EXTRA_STREAM, bmpUri);
shareIntent.setType("image/*");
// Launch sharing dialog for image
startActivity(Intent.createChooser(shareIntent, "Share Image"));
} else {
// ...sharing failed, handle error
}
}
// Returns the URI path to the Bitmap displayed in specified ImageView
public Uri getLocalBitmapUri(ImageView imageView) {
// Extract Bitmap from ImageView drawable
Drawable drawable = imageView.getDrawable();
Bitmap bmp = null;
if (drawable instanceof BitmapDrawable){
bmp = ((BitmapDrawable) imageView.getDrawable()).getBitmap();
} else {
return null;
}
// Store image to default external storage directory
Uri bmpUri = null;
try {
File file = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DOWNLOADS), "share_image_" + System.currentTimeMillis() + ".png");
file.getParentFile().mkdirs();
FileOutputStream out = new FileOutputStream(file);
bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
out.close();
bmpUri = Uri.fromFile(file);
} catch (IOException e) {
e.printStackTrace();
}
return bmpUri;
}
Make sure you have the following permissions given.
确保您拥有以下权限。
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
回答by Simas
Here's how you can share a link:
分享链接的方法如下：
Intent intent = new Intent(Intent.ACTION_SEND);
Uri uri = Uri.parse("http://linkto.com/your_image.png");
intent.setType("image/*");
intent.putExtra(Intent.EXTRA_STREAM, String.valueOf(uri));
startActivity(intent);
回答by belphegor
Another alternative way to achieve this with using method from previous answeris:
使用先前答案中的方法实现此目的的另一种替代方法是：
Picasso.with(this).load(imageurl).into(shareTarget);
private Target shareTarget = new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
// Get access to the URI for the bitmap
Uri bmpUri = getLocalBitmapUri(bitmap);
if (bmpUri != null) {
// Construct a ShareIntent with link to image
Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.putExtra(Intent.EXTRA_TEXT, getString(R.string.share_text));
shareIntent.putExtra(Intent.EXTRA_STREAM, bmpUri);
shareIntent.setType("image/*");
// Launch sharing dialog for image
startActivity(Intent.createChooser(shareIntent, "Share Image"));
} else {
// ...sharing failed, handle error
}
}
@Override
public void onBitmapFailed(Drawable errorDrawable) {
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
};
public Uri getLocalBitmapUri(Bitmap bmp) {
// Store image to default external storage directory
Uri bmpUri = null;
try {
File file = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DOWNLOADS), "share_image_" + System.currentTimeMillis() + ".png");
file.getParentFile().mkdirs();
FileOutputStream out = new FileOutputStream(file);
bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
out.close();
bmpUri = Uri.fromFile(file);
} catch (IOException e) {
e.printStackTrace();
}
return bmpUri;
}
