Transfer file (.txt) between apps

Question

An application is exporting a text (.txt) file when shared through it, I can see apps like Gmail, Dropbox, drive, share it etc to share it through that app. I want to import that text file in my application for further modification of that. txt file. What should I implement in manifest or main activity? Should I use INTENT filter or should I use getUriForFile() method to receive the text file? How will my app appear in other apps sharing list which export text files?.

Answer 1

You can use the following intent-filter for importing any file from another application into your manifest

            <intent-filter>
            <action android:name="android.intent.action.SEND"/>
            <category android:name="android.intent.category.DEFAULT"/>
            <data android:mimeType="*/*"/>
            <data android:mimeType="text/plain"/>

Then use below code in your activity for getting URI for a text file

    private Uri getUriForFile() {
    Intent intent = getIntent();
    String action = intent.getAction();
    String type = intent.getType();
    if (TextUtils.equals(Intent.ACTION_SEND, action) && !TextUtils.isEmpty(type)) {

        Uri uri = intent.getParcelableExtra(Intent.EXTRA_STREAM);
        if (uri != null) {
            Log.e("uri",uri.toString());
            return  uri;
        }
    }
    return null;
}

UPDATE

if the activity is your launcher activity then use the following intent filter

    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
         <intent-filter>
            <action android:name="android.intent.action.SEND_MULTIPLE"/>
            <category android:name="android.intent.category.DEFAULT"/>
            <data android:mimeType="*/*"/>
            <data android:mimeType="text/plain"/>
        </intent-filter>
    </activity>