Example of an explicit Android Intent, calling another Intent
2. Explicit Intent example
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Example preview:
This is the model of the example:
Create "Empty Activity" project named ExplicitIntentExample:
- Name: ExplicitIntentExample
- Package name: org.o7planning.explicitintentexample
- main_activity.xml
If you are interested in the steps to design the interface of this application, please see the appendix at the end of the article.
activity_main.xml
<?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:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="27dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="26dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:text="Full Name:"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/editText_fullName"
android:layout_width="0dp"
android:layout_height="46dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="15dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:ems="10"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />
<Button
android:id="@+id/button_sendMessage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="28dp"
android:text="Send message to GreetingActivity"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editText_fullName" />
<TextView
android:id="@+id/textView2"
android:layout_width="0dp"
android:layout_height="34dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="34dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:text="Feedback from GreetingActivity:"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button_sendMessage" />
<TextView
android:id="@+id/textView_feedback"
android:layout_width="0dp"
android:layout_height="46dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="23dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:text="((Feedback))"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView2" />
</androidx.constraintlayout.widget.ConstraintLayout>
When users click the button, the program will call a other Activity to displays a greeting. You need to create an Activity with name GreetingActivity.
- File > New > Activity > Empty Activity
- activity_greeting.xml
activity_greeting.xml
<?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=".GreetingActivity">
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="29dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="27dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:text="Message sent from MainActivity:"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView_message"
android:layout_width="0dp"
android:layout_height="42dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="23dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:text="((Message))"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />
<Button
android:id="@+id/button_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="63dp"
android:text="Back"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView_message" />
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package org.o7planning.explicitintentexample;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private EditText editTextFullName;
private TextView textFeedback;
private Button buttonSendMessage;
public static final int MY_REQUEST_CODE = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.editTextFullName = (EditText)this.findViewById(R.id.editText_fullName);
this.textFeedback = (TextView)this.findViewById(R.id.textView_feedback);
this.buttonSendMessage = (Button)this.findViewById(R.id.button_sendMessage);
this.buttonSendMessage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sendMessage();
}
});
}
// When 'Greeting Activity' completed, it sends back a feedback.
// (If you have started it by startActivityForResult())
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK && requestCode == MY_REQUEST_CODE) {
String feedback = data.getStringExtra("feedback");
this.textFeedback.setText(feedback);
} else {
this.textFeedback.setText("!?");
}
}
// The method is called when the user clicks on "Send Message to GreetingActivity" button.
public void sendMessage( ) {
String fullName= this.editTextFullName.getText().toString();
String message = "Hello, Please say hello me!";
Intent intent = new Intent(this,GreetingActivity.class);
intent.putExtra("fullName", fullName);
intent.putExtra("message", message);
// Start Activity and no need feedback.
// this.startActivity(intent);
// Start Activity and get feedback.
this.startActivityForResult(intent, MY_REQUEST_CODE);
}
}
GreetingActivity.java
package org.o7planning.explicitintentexample;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class GreetingActivity extends AppCompatActivity {
private TextView textViewMessage;
private Button buttonBack;
private String fullName;
private String message;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_greeting);
this.textViewMessage =(TextView) this.findViewById(R.id.textView_message);
this.buttonBack = (Button) this.findViewById(R.id.button_back);
this.buttonBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
goBack();
}
});
// Intent is passed into
Intent intent = this.getIntent();
this.fullName = intent.getStringExtra("fullName");
this.message = intent.getStringExtra("message");
this.textViewMessage.setText(this.message );
}
// When completed this Activity, send feedback to the caller.
@Override
public void finish() {
// Prepare data intent
Intent data = new Intent();
String feedback = "OK, Hello " + this.fullName + ". How are you?";
data.putExtra("feedback", feedback);
// Activity finished ok, return the data
this.setResult(Activity.RESULT_OK, data);
super.finish();
}
// The method is called when the user clicks the "Back" button.
public void goBack() {
// Calling onBackPressed() method to back to the previous Activity.
this.onBackPressed();
}
}
Running application:
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