[JAVA] [Android] How to pass images and receive callbacks when sharing using ShareCompat

↓ This thing

I felt that there was a lot of information, but it didn't come out unexpectedly, so I wrote a memo.

Library

com.android.support:support-compat:28.0.0

Implementation

`SomeActivity.java`


//Prerequisite code to run from within the activity
private void showShareChooser() {
	File tempFile = new File(getApplicationContext().getExternalCacheDir(), tempImgFilePath);

	//If you want to get the URI to share the file, you need to get it by specifying the name of the authority described later through FileProvider.
	Uri uri = FileProvider.getUriForFile(getApplicationContext()
			, getApplicationContext().getPackageName() + ".provider"
			, tempFile);

	ShareCompat.IntentBuilder builder = ShareCompat.IntentBuilder.from(this);
	builder.setChooserTitle(chooserTitle) //Title when sharing
			.setSubject(subject) //subject. How it is used depends on the shared app
			.setText(text) //Text. How it is used depends on the shared app
			.setStream(uri) //When sharing a file, specify its URI
			.setType("image/jpeg"); //MIME type of the file specified in the stream

	//Grant read permission on the URI
	Intent intent = builder.createChooserIntent().addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

	//If you want to receive a callback, use that intent to start the activity
	if (intent.resolveActivity(getPackageManager()) != null) {
		startActivityForResult(intent, SNS_SHARE);
	}

	//If you don't need to receive the results, you can just start from the builder
	// builder.startChooser();
}

If you want to receive the return, you can receive it with ʻonActivityResult` as usual.

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
	switch (requestCode) {
		case SNS_SHARE:
			//Receive the return and do something
			//resultCode is always zero, so RESULT_Do not judge with OK
			doSomething();
			break;

		default:
			super.onActivityResult(requestCode, resultCode, data);
			break;
	}
}

When sharing files

When sharing images etc., Bitmap cannot be shared as it is, so it is necessary to save it to a file once. In addition, it is necessary to allow reading from the save destination as follows.

First, specify the path in XML.

`src/main/res/xml/provider_paths.xml`


<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-cache-path name="cache" path="." />
</paths>

ʻExternal-cache-path etc. changes depending on the save destination. Although it is in English, see [Official FileProvider Reference](https://developer.android.com/reference/android/support/v4/content/FileProvider). Then specify that provider in ʻAndroidManifest.xml.

`AndroidManifest.xml`


<manifest
    package="com.example"
    xmlns:android="http://schemas.android.com/apk/res/android">
:
        <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="${applicationId}.provider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths"/>
        </provider>
:
    </application>
:
</manifest>