我正在尝试将由图库或相机选择的m图像发送到另一个活动,但似乎没有发生任何事情,我已将Bitmap转换为字符串以通过意图发送它但似乎永远不会调用intent
请帮助我,我做错了什么?
这是我的onActivityResult()代码
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Bitmap thumbnail = null;
if(requestCode==RESULT_LOAD_IMAGE){
if(resultCode==RESULT_OK){
Uri selectedImageUri = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImageUri,filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
data.getExtras().get("data");
thumbnail = (BitmapFactory.decodeFile(picturePath));
//CONVERT BITMAP TO STRING
ByteArrayOutputStream baos=new ByteArrayOutputStream();
thumbnail.compress(Bitmap.CompressFormat.PNG,100, baos);
byte [] b=baos.toByteArray();
String temp=Base64.encodeToString(b, Base64.DEFAULT);
//trying to start activity...
Intent intent = new Intent(Home.this, Upload.class);
intent.putExtra("picture", temp);
startActivity(intent);}
}
}
}
答案 0 :(得分:1)
为什么不使用文件路径并在其他活动中重新加载,而不是将图像转换为字符串?我的应用Pic4Share遇到了同样的问题,我就这样解决了。
在从图库加载图片的活动中:
String stringPath;
protected void onActivityResult(int requestCode, int resultCode,Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
switch(requestCode) {
case SELECT_PHOTO:
if(resultCode == RESULT_OK){
Uri selectedImage = imageReturnedIntent.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
stringPath = cursor.getString(columnIndex); // ***Here is stored the path***
cursor.close();
BitmapFactory.Options opts = new BitmapFactory.Options ();
opts.inSampleSize = 4; // for 1/2 the image to be loaded
opts.inPurgeable = true;
image.setImageBitmap(decodeSampledBitmapFromFile(txtPath, 800, 800));
}
else{
//Toast.makeText(getApplicationContext(),"Error", Toast.LENGTH_SHORT).show();
}
}
}
}
然后你可以使用intent传递带有路径的字符串:
Intent intent = new Intent(Home.this, Upload.class);
Bundle b = new Bundle();
b.putString("picture", stringPath);
intent.putExtras(b);
startActivity(intent);
最后,在您的其他应用程序中,您使用以下路径重新加载图片:
Bundle b = getIntent().getExtras();
String picturePath = b.getString("picture");
Bitmap scaledBitmap = decodeSampledBitmapFromFile(picturePath, 150, 150);
答案 1 :(得分:0)
我不知道你是否需要在String对象中转换你的位图以尊重你活动中的某些逻辑。如果不是这种情况,那么转换位图 - >字符串变得无用,因为Bitmap
实现了Parcelable
,因此您可以使用putExtra(String name, Parcelable value)
方法通过意图传递它。
您可以在此link
找到一些代码示例:
发送意图
Intent intent = new Intent(Home.this, Upload.class);
intent.putExtra("picture", thumbnail);
并从其他活动中检索
Bitmap bitmap = (Bitmap) intent.getParcelableExtra("picture");
希望有所帮助