PDM2 20210105

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

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

//

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:gravity="center_horizontal"
        app:layout_constraintTop_toTopOf="parent"
        android:id="@+id/idTvAbout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/strTvAbout"/>

    <TextView
        app:layout_constraintTop_toBottomOf="@id/idTvAbout"
        android:id="@+id/idTvCapturedText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
    />

</androidx.constraintlayout.widget.ConstraintLayout>

//
package com.joythis.android.pdm2textcapturer;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    Context mContext;

    TextView mTvAbout, mTvCapturedText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        init();
    }//onCreate

    void init(){
        mContext = this;

        mTvAbout = findViewById(R.id.idTvAbout);
        mTvCapturedText = findViewById (R.id.idTvCapturedText);

        checkIfCalledByAnotherAppAndReceiveItsSharedData();
    }//init

    void checkIfCalledByAnotherAppAndReceiveItsSharedData(){
        Intent intentHowWasICalled = getIntent();

        if (intentHowWasICalled!=null){
            String strAction = intentHowWasICalled.getAction();

            boolean bIsItActionSend =
                strAction.equals(Intent.ACTION_SEND);

            //"banana".compareTo("Banana")!=0
            //"banana".compareToIgnoreCase("Banana")==0
            boolean bIsItActionSend2 =
                strAction.compareTo(Intent.ACTION_SEND)==0;

            boolean bIsItActionSend3 =
                strAction.compareToIgnoreCase(Intent.ACTION_SEND)==0;

            //is this a share situation?
            if (bIsItActionSend){
                String strType =
                    intentHowWasICalled.getType();

                boolean bIsItSharedText =
                    strType.startsWith("text/");

                boolean bIsItSharedImage =
                    strType.startsWith("image/");

                if (bIsItSharedText){
                    //TODO: we can handle text!
                    //receive the shared text
                    String strSharedText =
                        intentHowWasICalled.getStringExtra(
                            Intent.EXTRA_TEXT
                        );

                    //display the received text in mTvCapturedText
                    mTvCapturedText.setText(strSharedText);
                }//if

                if (bIsItSharedImage){
                    //TODO: how to handle image sharing?
                }
            }//if
        }//if
    }//checkIfCalledByAnotherAppAndReceiveItsSharedData
}//MainActivity