Go to Main activity without Reloading or Refreshing activity
In this article I am going to discuss about to back main activity without refresh or reload activity.
If you have multiple activities as well as long code and you want to go main activity then I am telling you tips to back main activity and save your code as well as efficiency of the application. This code save your time, code as well as efficiency of your android application
MainAcitivity => Second Activity => ThirdActivity => MainAcitivity
Follow the steps which are given below -:
- Open Eclipse
- Select New Android Application Project
- Enter Application Name as BackMainActivity
- Click Next
- Click Finish.
Now add the following control in res/layout/activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<EditText
android:id="@+id/etName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="38dp"
android:layout_marginTop="34dp"
android:ems="10" />
<Button
android:id="@+id/btnNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/etName"
android:layout_below="@+id/etName"
android:layout_marginRight="57dp"
android:text="Next" />
<TextView
android:id="@+id/tvMainActivity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="Main Activity" />
</RelativeLayout>
In res/layout add the two xml file name should be second.xml and third.xml .
In second.xml write the following code
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/tvSecondActivity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="14dp"
android:text="Second Activity" />
<Button
android:id="@+id/btnNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginRight="39dp"
android:layout_marginTop="30dp"
android:text="Next" />
</RelativeLayout>
In third.xml write the following code
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/btnBackMain"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="108dp"
android:text="Back in Main" />
<TextView
android:id="@+id/tvThird"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/btnBackMain"
android:text="Third Activity" />
</RelativeLayout>
In src/ com.example.backmainactivity add the two new class name should
be SecondActivity.java and ThirdActivity.java
Write the following code in MainActivity.java
package com.example.backmainactivity;
public class MainActivity extends Activity {
Button btnNext;
EditText etname;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnNext=(Button)findViewById(R.id.btnNext);
etname=(EditText)findViewById(R.id.etName);
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//Create a new Activity and start the new activity
Intent intent=newIntent(MainActivity.this,SecondActivity.class);
startActivity(intent);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
In SeondActivity.java write the following code
package com.example.backmainactivity;
public class SecondActivity extends Activity {
Button btnNext;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
btnNext=(Button)findViewById(R.id.btnNext);
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=newIntent(SecondActivity.this,ThirdActivity.class);
startActivity(intent);
}
});
}
}
Now last paste the following code in Thirdactivity.java
package com.example.backmainactivity;
public class ThirdActivity extends Activity {
Button btnBackMain;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.third);
btnBackMain=(Button)findViewById(R.id.btnBackMain);
btnBackMain.setOnClickListener(new View.OnClickListener() {
@SuppressLint("NewApi")
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// TODO getIntent() return the first intent. And navigateUpTo method is use to back the source activity
navigateUpTo(getIntent());//Back in First Activity
}
});
}
}
Now define the activity in AndroidManifest.xml
</activity>
<activityandroid:name="com.example.backmainactivity.SecondActivity"/>
<activityandroid:name="com.example.backmainactivity.ThirdActivity"/>
Run your application output like this
Click the Next button and a new activity will be open
Again click Next button
Click Back in Main button and go back in main activity
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