CODEWITHSUNDEEP
androidandroid-intent
mia
mia

Reputation: 83

Android Activity within Activity using Intent

I have one activity which has 2 button clicking on which takes to second and third activity. Second activity has 2 buttons "return to main activity" and "click to third activity". When I click on to "return main activity button" it isn't returning to main activity screen But when I click on "go to 3rd activity" button it is going to third activity. Can someone help me why my "return main activity button" isn't working?

here is my code

main activity
{
package com.example.aditya.activitywithinactivity;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.view.View.OnClickListener;

import static com.example.aditya.activitywithinactivity.R.id.start;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

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

        Button bttn1 = (Button) findViewById(R.id.button1);
        bttn1.setOnClickListener(MainActivity.this);
        Button bttn2 = (Button) findViewById(R.id.button2);
        bttn2.setOnClickListener(MainActivity.this);
    }
    public void onClick(View v) {
        switch (v.getId()) {

            case R.id.button1: {
                Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                startActivity(intent);
            }
            case R.id.button2: {
                Intent intent1 = new Intent(MainActivity.this, ThirdActivity.class);
                startActivity(intent1);
            }
        }
    }
    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        setContentView(R.layout.activity_main);

    };
}

SecondActivity.java

package com.example.aditya.activitywithinactivity;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;

public class SecondActivity extends AppCompatActivity implements View.OnClickListener {

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

        Button bttn3 = (Button) findViewById(R.id.button3);
        bttn3.setOnClickListener(SecondActivity.this);
        Button bttn4 = (Button) findViewById(R.id.button4);
        bttn4.setOnClickListener(SecondActivity.this);
    }
    public void onClick(View v) {
        switch (v.getId()) {

            case R.id.button3: {
                Intent intent2 = new Intent(this, MainActivity.class);
                intent2.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
                intent2.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
                startActivity(intent2);
            }
            case R.id.button4: {
                Intent intent3 = new Intent(SecondActivity.this, ThirdActivity.class);
                startActivity(intent3);
            }
        }
    };
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <EditText
        android:id="@+id/myText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="buttonClicked"
        android:text="Click to go to Secondary Activity" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="buttonClicked"
        android:text="Click to go to Third Activity" />

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

activity_second

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/myText2" />
    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="buttonClicked"
        android:text="Return to Main Activity"/>
    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="buttonClicked"
        android:text="Click to go to Third Activity"/>

</LinearLayout>

Upvotes: 1

Views: 1346

Answers (5)

mhenryk
mhenryk

Reputation: 551

There is no break; statement in your switch. It just continues to the next case step and therefore next activity. Also you can simply call finish() to end your current activity and go back - this will work better for your backstack. Anyway add break; after each case. Please check this Oracle tutorial about Switch statement.

Upvotes: -1

Aaron Lee
Aaron Lee

Reputation: 2155

The two lines code is in your source:

intent2.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
intent2.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);

I want to know what do you want to do between two activities. The two sources follow can do it, but they are different.

    //Source code 1:
   Intent intent2 = new Intent(SecondActivity.this, MainActivity.class);
   startActivity(intent2);

//Source code 2:
onBackPressed(); // or finish();

If use source code 1, the activities task will create another MainActivity object and put it to the top of task.

MainActivity@obj1 | SecondActivity@obj1 ==>

MainActivity@obj1 | SecondActivity@obj1 | MainActivity@obj2

If use source code 2, the activities tasks will remove SecondActivity object so that the MainActivity object at the top.

MainActivity@obj1 | SecondActivity@obj1 ==>

MainActivity@obj1

Upvotes: 0

KDD
KDD

Reputation: 148

change in MainActivity

Intent i= new Intent(MainActivity.this, SecondActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
finish();

Upvotes: 1

Damini Mehra
Damini Mehra

Reputation: 3347

try this:

public void onClick(View v) {
    switch (v.getId()) {

        case R.id.button3: {
            Intent intent2 = new Intent(SecondActivity.this, MainActivity.class);

            startActivity(intent2);
            break;
        }
        case R.id.button4: {
            Intent intent3 = new Intent(SecondActivity.this, ThirdActivity.class);
            startActivity(intent3);
           break;
        }
    }
};

Upvotes: 2

Burhanuddin Rashid
Burhanuddin Rashid

Reputation: 5370

You can call method onBackPressed(); when return MainActivity button is clicked like this in SecondActivity.java and use break in switch statement 

     public void onClick(View v) {
            switch (v.getId()) {

                case R.id.button3: 
                      onBackPressed();
                      break;

                case R.id.button4: 
                    Intent intent3 = new Intent(SecondActivity.this, ThirdActivity.class);
                    startActivity(intent3);
                    break;

            }
        };

Upvotes: 1

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