Bradley/AndroidInterActivityStateSharingExample
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Adding a way to see what's been logged, back button on FirstActivity still isn't right...

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This commit is contained in:
Bradley Bickford 2025-03-03 18:30:24 -05:00
parent f27355fa2d
commit bf033932a1
10 changed files with 245 additions and 11 deletions
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6
.idea/vcs.xml generated Normal file
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@ -0,0 +1,6 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$" vcs="Git" />
</component>
</project>

8
app/src/main/java/com/coldlightalchemist/interactivitystatesharingexample/Constants.java Normal file
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@ -0,0 +1,8 @@
package com.coldlightalchemist.interactivitystatesharingexample;
public class Constants {
public static final String kInterActivityStateKey = "Inter Activity State";
public static final String kFileName = "MyFile.csv";
public static final String[] kCSVHeaders = {"First Activity String", "Second Activity Int"};
}

30
app/src/main/java/com/coldlightalchemist/interactivitystatesharingexample/FirstActivity.java
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@ -1,5 +1,7 @@
package com.coldlightalchemist.interactivitystatesharingexample;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
@ -8,6 +10,8 @@ import android.widget.Button;
import android.widget.EditText;
import androidx.activity.EdgeToEdge;
import androidx.activity.OnBackPressedCallback;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
@ -32,7 +36,29 @@ public class FirstActivity extends AppCompatActivity {
return insets;
});
InterActivityState state = (InterActivityState) Objects.requireNonNull(getIntent().getExtras()).get(MainActivity.kInterActivityStateKey);
Context context = getApplicationContext();
InterActivityState state = (InterActivityState) Objects.requireNonNull(getIntent().getExtras()).get(Constants.kInterActivityStateKey);
this.getOnBackPressedDispatcher().addCallback(new OnBackPressedCallback(true) {
@Override
public void handleOnBackPressed() {
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(context);
DialogInterface.OnClickListener listener = (d, w) -> {
switch(w) {
case DialogInterface.BUTTON_POSITIVE:
finish();
break;
case DialogInterface.BUTTON_NEGATIVE:
break;
}
};
alertBuilder.setMessage("Are you sure you want to back out, the data you've entered so far will be lost!")
.setPositiveButton("Yes", listener)
.setNegativeButton("No", listener)
.show();
}
});
enterStringField = (EditText) findViewById(R.id.enterStringField);
enterStringField.addTextChangedListener(new TextWatcher() {
@ -56,7 +82,7 @@ public class FirstActivity extends AppCompatActivity {
moveToSecondActivity = (Button) findViewById(R.id.moveToSecondActivity);
moveToSecondActivity.setOnClickListener((v) -> {
Intent secondActivityIntent = new Intent(v.getContext(), SecondActivity.class);
secondActivityIntent.putExtra(MainActivity.kInterActivityStateKey, state);
secondActivityIntent.putExtra(Constants.kInterActivityStateKey, state);
startActivity(secondActivityIntent);
});

5
app/src/main/java/com/coldlightalchemist/interactivitystatesharingexample/InterActivityState.java
View File

@ -9,9 +9,6 @@ import java.io.Serializable;
import java.nio.file.Files;
public class InterActivityState implements Serializable {
private static final String[] kCSVHeaders = {"First Activity String", "Second Activity Int"};
private File writeFile;
private String firstActivityString;
private int secondActivityInt;
@ -44,7 +41,7 @@ public class InterActivityState implements Serializable {
PrintWriter writer = new PrintWriter(new FileWriter(writeFile, true));
if (!fileExists) {
writer.println(Utilities.makeCSVString(kCSVHeaders));
writer.println(Utilities.makeCSVString(Constants.kCSVHeaders));
}
writer.println(Utilities.makeCSVString(firstActivityString, Integer.toString(secondActivityInt)));

52
app/src/main/java/com/coldlightalchemist/interactivitystatesharingexample/MainActivity.java
View File

@ -1,8 +1,13 @@
package com.coldlightalchemist.interactivitystatesharingexample;
import static android.view.View.INVISIBLE;
import static android.view.View.VISIBLE;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import androidx.activity.EdgeToEdge;
@ -11,17 +16,27 @@ import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import org.w3c.dom.Text;
import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
private InterActivityState interActivityState;
private Button startDataEntry;
public static final String kInterActivityStateKey = "Inter Activity State";
public static final String kFileName = "MyFile.csv";
private TextView nothingInFile;
private RecyclerView dataInFile;
private File dataFile;
@Override
protected void onCreate(Bundle savedInstanceState) {
@ -34,12 +49,41 @@ public class MainActivity extends AppCompatActivity {
return insets;
});
dataFile = new File(getFilesDir(), Constants.kFileName);
startDataEntry = (Button) findViewById(R.id.startDataEntry);
startDataEntry.setOnClickListener((v) -> {
interActivityState = new InterActivityState(new File(v.getContext().getFilesDir(), kFileName));
interActivityState = new InterActivityState(dataFile);
Intent firstActivityIntent = new Intent(v.getContext(), FirstActivity.class);
firstActivityIntent.putExtra(kInterActivityStateKey, interActivityState);
firstActivityIntent.putExtra(Constants.kInterActivityStateKey, interActivityState);
startActivity(firstActivityIntent);
});
nothingInFile = (TextView) findViewById(R.id.nothingInFile);
dataInFile = (RecyclerView) findViewById(R.id.dataInFile);
dataInFile.setLayoutManager(new LinearLayoutManager(this));
try {
List<Map<String, String>> currentFileData = Utilities.readFormattedCSV(dataFile);
if (currentFileData == null || currentFileData.isEmpty()) {
nothingInFile.setVisibility(VISIBLE);
dataInFile.setVisibility(INVISIBLE);
} else {
nothingInFile.setVisibility(INVISIBLE);
dataInFile.setVisibility(VISIBLE);
Log.d("RECYCLER DATA", "Recycler Data Size: " + currentFileData.size());
StoredDataRecyclerViewAdapter adapter = new StoredDataRecyclerViewAdapter(currentFileData);
dataInFile.setAdapter(adapter);
}
} catch (IOException e) {
nothingInFile.setVisibility(VISIBLE);
dataInFile.setVisibility(INVISIBLE);
Log.d("FILE READ", "Failed to read the data file for some reason", e);
}
}
}

2
app/src/main/java/com/coldlightalchemist/interactivitystatesharingexample/SecondActivity.java
View File

@ -35,7 +35,7 @@ public class SecondActivity extends AppCompatActivity {
return insets;
});
InterActivityState state = (InterActivityState) Objects.requireNonNull(getIntent().getExtras()).get(MainActivity.kInterActivityStateKey);
InterActivityState state = (InterActivityState) Objects.requireNonNull(getIntent().getExtras()).get(Constants.kInterActivityStateKey);
editNumber = (EditText) findViewById(R.id.editNumber);
editNumber.addTextChangedListener(new TextWatcher() {

65
app/src/main/java/com/coldlightalchemist/interactivitystatesharingexample/StoredDataRecyclerViewAdapter.java Normal file
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@ -0,0 +1,65 @@
package com.coldlightalchemist.interactivitystatesharingexample;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
import java.util.Map;
public class StoredDataRecyclerViewAdapter extends RecyclerView.Adapter<StoredDataRecyclerViewAdapter.StoredDataRecyclerViewHolder> {
private final List<Map<String, String>> data;
public static class StoredDataRecyclerViewHolder extends RecyclerView.ViewHolder {
private final TextView rvFirstActivityString;
private final TextView rvSecondActivityInt;
public StoredDataRecyclerViewHolder(View itemView) {
super(itemView);
rvFirstActivityString = itemView.findViewById(R.id.rvFirstActivityString);
rvSecondActivityInt = itemView.findViewById(R.id.rvSecondActivityInt);
}
public TextView getFirstActivityStringTextView() {
return rvFirstActivityString;
}
public TextView getSecondActivityIntTextView() {
return rvSecondActivityInt;
}
}
public StoredDataRecyclerViewAdapter(List<Map<String, String>> data) {
this.data = data;
}
@NonNull
@Override
public StoredDataRecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.stored_data_recycler_view_item, parent, false);
return new StoredDataRecyclerViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull StoredDataRecyclerViewHolder holder, int position) {
holder.getFirstActivityStringTextView().setText(
data.get(position).get(Constants.kCSVHeaders[0])
);
holder.getSecondActivityIntTextView().setText(
data.get(position).get(Constants.kCSVHeaders[1])
);
}
@Override
public int getItemCount() {
return data.size();
}
}

27
app/src/main/java/com/coldlightalchemist/interactivitystatesharingexample/Utilities.java
View File

@ -1,6 +1,12 @@
package com.coldlightalchemist.interactivitystatesharingexample;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
public class Utilities {
@ -9,4 +15,25 @@ public class Utilities {
.map((s) -> "\"" + s + "\"")
.collect(Collectors.joining(","));
}
public static List<Map<String, String>> readFormattedCSV(File toRead) throws IOException {
if (!toRead.exists()) {
return null;
}
BufferedReader reader = new BufferedReader(new FileReader(toRead));
return reader.lines()
.filter((s) -> !s.equals(makeCSVString(Constants.kCSVHeaders)))
.map((s) -> {
String[] spliteration = s.split("\",\"");
// TODO: If you were to add columns, this would need to be more dynamic then it is
return Map.of(
Constants.kCSVHeaders[0], spliteration[0].replace("\"", ""),
Constants.kCSVHeaders[1], spliteration[1].replace("\"", "")
);
})
.collect(Collectors.toList());
}
}

11
app/src/main/res/layout/activity_main.xml
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@ -29,6 +29,17 @@
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Start Data Entry" />
<TextView
android:id="@+id/nothingInFile"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="THERE IS NOTHING IN THE DATA FILE!" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/dataInFile"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>

50
app/src/main/res/layout/stored_data_recycler_view_item.xml Normal file
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@ -0,0 +1,50 @@
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/textView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="First Activity String" />
<TextView
android:id="@+id/rvFirstActivityString"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/textView9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Second Activity Int" />
<TextView
android:id="@+id/rvSecondActivityInt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>