The way Android implements communication between activity _android

The examples in this article describe the way Android implements communication between activity. Share to everyone for your reference. Specifically as follows:

A system-supplied startactivity (Intent Intent) method can be used to open new activity in an activity, and you can decide whether to pass parameters for new activity before opening a new activity.

First: Open new activity, do not pass parameters

public class Mainactivity extends activity {
  @Override public
  void OnCreate (Bundle savedinstancestate) {
    Super.oncreate (savedinstancestate);
    Setcontentview (r.layout.main);
    Button btnopen= (button) This.findviewbyid (r.id.btnopen);
    Btnopen.setonclicklistener (New View.onclicklistener () {public
      void OnClick (View v) {
        //new an explicit intent, The first parameter is the current Activity class object, and the second parameter is the activity class startactivity you want to open
        (new Intent (Mainactivity.this, Otheractivity.class));
      }
    });
  }
}

Second: Open a new activity and pass several arguments to it

Package com.ljq.activitys;
Import android.app.Activity;
Import android.content.Intent;
Import Android.os.Bundle;
Import Android.view.View;
Import Android.widget.Button; public class Mainactivity extends activity {@Override public void onCreate (Bundle savedinstancestate) {Super.onc
    Reate (savedinstancestate);
    Setcontentview (R.layout.main);
    Button btnopen= (button) This.findviewbyid (R.id.btnopen); Btnopen.setonclicklistener (New View.onclicklistener () {public void OnClick (View v) {//First: Open a new activity, do not pass the parameter Number//Create an explicit intent, the first parameter is the current Activity class object, and the second parameter is the activity class you want to open//startactivity (new Intent (Mainactivity.this, Othera
        Ctivity.class));
        Second: Open new activity and pass several parameters to it Intent intent=new Intent (Mainactivity.this, Otheractivity.class);
        The Bundle class is used for carrying data Bundle bundle=new Bundle ();
        Bundle.putstring ("name", "Linjiqin");
        Bundle.putint ("Age", 24);
        Attached with additional data Intent.putextras (bundle); StartactIvity (Intent);
  }
    });

 }
}

To receive the parameters passed by the previous activity in a new activity

Package com.ljq.activitys;
Import android.app.Activity;
Import Android.os.Bundle;
Import Android.util.Log;
public class Otheractivity extends activity {
  Private final static String tag= "Otheractivity";
  @Override
  protected void onCreate (Bundle savedinstancestate) {
    super.oncreate (savedinstancestate);
    Setcontentview (r.layout.other);
    In the new activity receive the parameters passed by the preceding activity
    Bundle bundle=this.getintent (). Getextras ();
    String name=bundle.getstring ("name");
    Integer age=bundle.getint ("Age");
    LOG.I (TAG, name+ ":" +age);
  }

I hope this article will help you with your Android program.