Why I can't send broadcast to receiver successfull if Intent was set Type?

Question

I create a receiver and dynamic register it in my app:

MyReceiver receiver = new MyReceiver();
IntentFilter intentFilter = new IntentFilter("com.test.receiver");
LocalBroadcastManager.getInstance(this).registerReceiver(receiver, intentFilter); 

I write some codes as below to sending broadcast, my receiver can recive the message successull, everything is ok.

Intent intent = new Intent();
intent.setAction("com.test.receiver");
LocalBroadcastManager.getInstance(MainActivity.this).sendBroadcast(intent);

But if I try to setType() for the Intent, my receiver will not work, nothing will be received.

Intent intent = new Intent();
intent.setAction("com.test.receiver");

intent.setType("test");

LocalBroadcastManager.getInstance(this).sendBroadcast(intent);

According to Android API document, Type doesn't have intent-filter function, do you know why?

Answer 1

From Android documentation, setType() method is used to set valid MIME type.

setType(String type)

Set an explicit MIME data type.

Here is common MIME type that you can send.

image/jpeg
audio/mpeg4-generic
text/html
audio/mpeg
audio/aac
audio/wav
audio/ogg
audio/midi
audio/x-ms-wma
video/mp4
video/x-msvideo
video/x-ms-wmv
image/png
image/jpeg
image/gif
.xml ->text/xml
.txt -> text/plain
.cfg -> text/plain
.csv -> text/plain
.conf -> text/plain
.rc -> text/plain
.htm -> text/html
.html -> text/html
.pdf -> application/pdf
.apk -> application/vnd.android.package-archive

Whereas test is not a valid MIME type.