PDM2 20210107

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

    <ImageView
        app:layout_constraintTop_toBottomOf="@id/idTvCapturedText"
        android:id="@+id/idIvCapturedImage"
        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.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.nio.charset.StandardCharsets;

public class MainActivity extends AppCompatActivity {
    Context mContext;
    TextView mTvAbout, mTvCapturedText;
    ImageView mIvCapturedImage;

    public final static String MY_DB = "MY_SHARED_TEXTS.DB";

    @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);
        mIvCapturedImage = findViewById (R.id.idIvCapturedImage);

        checkIfCalledByAnotherAppAndReceiveItsSharedData();

        mTvAbout.setText(
            whereIsThePrivateInternalStorage()
            +
            "\n"
            +
            getString(R.string.strTvAbout)
        );
    }//init

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

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

            boolean bItWasTheUserInterfaceOrAndroidStudio =
                strAction.equals(Intent.ACTION_MAIN);

            boolean bIsItActionSend =
                strAction.equals(Intent.ACTION_SEND); //share!

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

                //curious (serves both situations: text and image)
                Toast.makeText(
                    mContext,
                    strType,
                    Toast.LENGTH_LONG
                ).show();

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

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

                if (bIsItSharedText){
                    //receive the shared text
                    String strSharedText =
                        intentHowWasICalled.getStringExtra(
                            Intent.EXTRA_TEXT
                        );

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

                    insert(strSharedText);
                }//if

                if (bIsItSharedImage){
                    //TODO: how to handle image sharing?
                    Uri uriForTheImage =
                        intentHowWasICalled.getParcelableExtra(
                            Intent.EXTRA_STREAM
                        );
                    mIvCapturedImage.setImageURI(uriForTheImage);
                }
            }//if
        }//if
    }//checkIfCalledByAnotherAppAndReceiveItsSharedData

    Boolean insert(String pInsertWhat){
        return writeContentToFileInPIS(
            MY_DB,
            pInsertWhat+"\n", //TODO! "when \t what \n"
            MODE_APPEND
        );
    }//Boolean

    //---------------------------------------
    /*
    private internal storage?
    non-volatile memory region in the file system
    exclusive to each app
     */

    String whereIsThePrivateInternalStorage(){
        File pis = this.getFilesDir();
        return pis.getAbsolutePath();
    }//whereIsThePrivateInternalStorage

    Boolean writeContentToFileInPIS(
        String pFileName,
        String pFileContent,
        int pWriteMode //MODE_PRIVATE , MODE_APPEND
    ){
        try{
            FileOutputStream fos =
                this.openFileOutput(
                    pFileName,
                    pWriteMode
                );

            if (fos!=null){
                //fos.write(pFileContent);
                OutputStreamWriter osw =
                    new OutputStreamWriter(
                        fos,
                        StandardCharsets.UTF_8
                    );

                if (osw!=null){
                    osw.write(pFileContent);

                    osw.close();
                    fos.close();
                    return true;
                }//if got OutputStreamWrite
            }//if got FileOutputStream
        }//try
        catch (Exception e){
            Log.e(
                getClass().getName(),
                e.toString()
            );
        }//catch

        return false;
    }//writeContentToFileInPIS

    String readContentFromFileInPIS (
        String pFileName
    ){
        try {
            FileInputStream fis = this.openFileInput(pFileName);
            if (fis!=null){
                InputStreamReader isr = new InputStreamReader(
                    fis,
                    StandardCharsets.UTF_8
                );
                if (isr!=null){
                    char c; int i; String strAll = "";

                    while((i=isr.read())!=-1){
                        c = (char)i;
                        strAll+=c;
                    }//while

                    isr.close();
                    fis.close();

                    return strAll;
                }//if
            }//if
        }//try
        catch (Exception e){
            Log.e(
                getClass().getName(),
                e.toString()
            );
        }//catch

        return "";
    }//readContentFromFileInPIS

}//MainActivity