在我的Android应用程序中,我有一个位图(比如说b)和一个按钮。现在当我点击按钮时,我想分享位图。我正在使用onClick()
中的以下代码来实现此目的: -
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("image/png");
intent.putExtra(Intent.EXTRA_STREAM, b);
startActivity(Intent.createChooser(intent , "Share"));
我期待所有能够处理此意图的应用程序列表,但我什么也得不到。没有应用程序列表也没有android studio中的任何错误。我的应用程序暂停了一段时间然后退出。
我检查了位图,它很好(它不是空的)。
我哪里出错?
答案 0 :(得分:24)
正如CommonsWare所说,你需要获取位图的URI并将其作为Extra。
传递String bitmapPath = Images.Media.insertImage(getContentResolver(), bitmap,"title", null);
Uri bitmapUri = Uri.parse(bitmapPath);
...
intent.putExtra(Intent.EXTRA_STREAM, bitmapUri );
答案 1 :(得分:24)
我找到了解决方案的2个变体。两者都将Bitmap保存到存储中,但图像未显示在库中。
保存到外部存储空间
在标记
之前添加到AndroidManifest.xml中<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"android:maxSdkVersion="18"/>
/**
* Saves the image as PNG to the app's private external storage folder.
* @param image Bitmap to save.
* @return Uri of the saved file or null
*/
private Uri saveImageExternal(Bitmap image) {
//TODO - Should be processed in another thread
Uri uri = null;
try {
File file = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES), "to-share.png");
FileOutputStream stream = new FileOutputStream(file);
image.compress(Bitmap.CompressFormat.PNG, 90, stream);
stream.close();
uri = Uri.fromFile(file);
} catch (IOException e) {
Log.d(TAG, "IOException while trying to write file for sharing: " + e.getMessage());
}
return uri;
}
可能无法访问外部存储空间,因此您应在尝试保存之前进行检查 - https://developer.android.com/training/data-storage/files
/**
* Checks wheather the external storage is writable.
* @return true if storage is writable, false otherwise
*/
public boolean isExternalStorageWritable() {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
return true;
}
return false;
}
使用FileProvider保存到cacheDir。它不需要任何许可。
<manifest>
...
<application>
...
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.mydomain.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
...
</application>
</manifest>
<?xml version="1.0" encoding="utf-8"?>
<resources>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<cache-path name="shared_images" path="images/"/>
</paths>
</resources>
/**
* Saves the image as PNG to the app's cache directory.
* @param image Bitmap to save.
* @return Uri of the saved file or null
*/
private Uri saveImage(Bitmap image) {
//TODO - Should be processed in another thread
File imagesFolder = new File(getCacheDir(), "images");
Uri uri = null;
try {
imagesFolder.mkdirs();
File file = new File(imagesFolder, "shared_image.png");
FileOutputStream stream = new FileOutputStream(file);
image.compress(Bitmap.CompressFormat.PNG, 90, stream);
stream.flush();
stream.close();
uri = FileProvider.getUriForFile(this, "com.mydomain.fileprovider", file);
} catch (IOException e) {
Log.d(TAG, "IOException while trying to write file for sharing: " + e.getMessage());
}
return uri;
}
有关文件提供程序的更多信息 - https://developer.android.com/reference/android/support/v4/content/FileProvider
压缩和保存可能非常耗时,这应该在不同的线程中完成
/**
* Shares the PNG image from Uri.
* @param uri Uri of image to share.
*/
private void shareImageUri(Uri uri){
Intent intent = new Intent(android.content.Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_STREAM, uri);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.setType("image/png");
startActivity(intent);
}
答案 2 :(得分:11)
**最后我得到了解决方案。**
第1步: 分享意图处理阻止。这将弹出您的窗口,其中包含您手机中的应用程序列表
public void share_bitMap_to_Apps() {
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("image/*");
ByteArrayOutputStream stream = new ByteArrayOutputStream();
/*compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] bytes = stream.toByteArray();*/
i.putExtra(Intent.EXTRA_STREAM, getImageUri(mContext, getBitmapFromView(relative_me_other)));
try {
startActivity(Intent.createChooser(i, "My Profile ..."));
} catch (android.content.ActivityNotFoundException ex) {
ex.printStackTrace();
}
}
第2步: 将视图转换为BItmap
public static Bitmap getBitmapFromView(View view) {
//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);
//Get the view's background
Drawable bgDrawable = view.getBackground();
if (bgDrawable != null)
//has background drawable, then draw it on the canvas
bgDrawable.draw(canvas);
else
//does not have background drawable, then draw white background on the canvas
canvas.drawColor(Color.WHITE);
// draw the view on the canvas
view.draw(canvas);
//return the bitmap
return returnedBitmap;
}
第3步:
从位图图片获取URI
public Uri getImageUri(Context inContext, Bitmap inImage) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
return Uri.parse(path);
}
答案 3 :(得分:4)
因此,内容:包含与Intent关联的数据流的URI,与ACTION_SEND一起使用以提供正在发送的数据。
b
不应该是Bitmap
,而是Uri
指向Bitmap
,由ContentProvider
提供服务。例如,您可以将Bitmap
写入文件,然后使用FileProvider
进行投放。
答案 4 :(得分:4)
ImageButton capture_share = (ImageButton) findViewById(R.id.share);
capture_share.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String bitmapPath = MediaStore.Images.Media.insertImage(getContentResolver(), bitmap,"title", null);
Uri bitmapUri = Uri.parse(bitmapPath);
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("image/png");
intent.putExtra(Intent.EXTRA_STREAM, bitmapUri);
startActivity(Intent.createChooser(intent, "Share"));
}
});
答案 5 :(得分:1)
花了很多时间之后:
检查是否已授予权限。然后:
步骤1:在活动中创建想要的图像的ImageView,然后将其转换为无位图
ImageView imageView = findViewById(R.id.image);
Bitmap bitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap();
//save the image now:
saveImage(bitmap);
//share it
send();
第2步:将图像存储在内部文件夹中:
private static void saveImage(Bitmap finalBitmap) {
String root = Environment.getExternalStorageDirectory().getAbsolutePath();
File myDir = new File(root + "/saved_images");
Log.i("Directory", "==" + myDir);
myDir.mkdirs();
String fname = "Image-test" + ".jpg";
File file = new File(myDir, fname);
if (file.exists()) file.delete();
try {
FileOutputStream out = new FileOutputStream(file);
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
第3步:发送保存的图像:
public void send() {
try {
File myFile = new File("/storage/emulated/0/saved_images/Image-test.jpg");
MimeTypeMap mime = MimeTypeMap.getSingleton();
String ext = myFile.getName().substring(myFile.getName().lastIndexOf(".") + 1);
String type = mime.getMimeTypeFromExtension(ext);
Intent sharingIntent = new Intent("android.intent.action.SEND");
sharingIntent.setType(type);
sharingIntent.putExtra("android.intent.extra.STREAM", Uri.fromFile(myFile));
startActivity(Intent.createChooser(sharingIntent, "Share using"));
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
现在,发送后,如果不想在存储中保存图像,可以将其删除。检查其他链接可以做到这一点。
答案 6 :(得分:0)
private void sharePalette(Bitmap bitmap) {
String bitmapPath = MediaStore.Images.Media.insertImage(getContentResolver(), bitmap, "palette", "share palette");
Uri bitmapUri = Uri.parse(bitmapPath);
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("image/png");
intent.putExtra(Intent.EXTRA_STREAM, bitmapUri);
startActivity(Intent.createChooser(intent, "Share"));
}
答案 7 :(得分:0)
Kotlin中的解决方案,其中图像名称带有时间戳:
list_dict = [{x:y for x,y in zip(r,['name', 'blood type', 'age'])} for r in mylist]