Android实现界面跳转功能

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package com.android02;

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.EditText;

public class MainActivity extends AppCompatActivity {

 //定义常量，作为消息的key
 public final static String MESSAGE_KEY="com.android2";

 @Override
 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);
  /**
   * 指定布局（res下的activity_main.xml编译成r.java）
   */
  setContentView(R.layout.activity_main);
 }

 /**
  *响应onclick事件
  */
 public void send(View button){

  //以id获取EditText
  EditText editText = findViewById(R.id.input);

  //获取编辑框文字
  String message = editText.getText().toString();

 //activity、service和broadcast receiver通过Intent进行交互
  Intent intent = new Intent(this,ReceiveActivity.class);

  //在intent中附加信息
  intent.putExtra(MESSAGE_KEY,message);
  startActivity(intent);
 }

}

package com.android02;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class ReceiveActivity extends AppCompatActivity {

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

  //获取intent引用
  Intent intent = getIntent();

  //以MESSAGE_KEY获取获取编辑框文字
  String message = intent.getStringExtra(MainActivity.MESSAGE_KEY);

  //以id获取TextView
  TextView textView = findViewById(R.id.output);

  //显示message
  textView.setText(message);

 }
}