多activity界面跳转并传递数据

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.zhoushasha.myapplication.MainActivity">

    <EditText
        android:id="@+id/et1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="请输入姓名"
        android:layout_gravity="center"
        android:textSize="25dp"
        />
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:id="@+id/bt1"
            android:layout_weight="1"
            android:onClick="onClick"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="进入评估"
            android:textSize="25dp"/>
        <Button
            android:id="@+id/bt2"
            android:layout_weight="1"
            android:onClick="onClick"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="退出"
            android:textSize="25dp"/>
    </LinearLayout>
    <TextView
        android:id="@+id/tv1"
        android:layout_gravity="center_horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="评论结果"
        android:textSize="25dp"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main2"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.zhoushasha.myapplication.Main2Activity">
<TextView
    android:id="@+id/tv1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="有没有信心？"
    android:textSize="54dp" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" />

        <Button
            android:id="@+id/bt1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="有"
            android:textSize="25dp"/>

    <Button
        android:id="@+id/bt2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="没有"
        android:textSize="25dp"/>
</LinearLayout>

第一个activity的跳转功能实现代码

package com.example.zhoushasha.myapplication;

import android.content.Context;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import static android.R.attr.data;
import static android.R.attr.name;
import static android.R.attr.revisionCode;

public class MainActivity extends AppCompatActivity {
    private Button bt1;
    private Button bt2;
    private Context mContent;
    private EditText et1;
    private TextView tv1;
    public static final int REQUEST_CODE = 1000;
    public static final int RESULT_CODE = 1001;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et1 = (EditText) findViewById(R.id.et1);
        bt1 = (Button) findViewById(R.id.bt1);
        bt2 = (Button) findViewById(R.id.bt2);
        tv1 = (TextView) findViewById(R.id.tv1);

    }
           public void onClick(View view) {
               switch (view.getId()) {
                   case R.id.bt1:
                       setBt1();
                       break;
               }
           }

           private void setBt1() {
               Intent intent = new Intent(MainActivity.this, Main2Activity.class);

               if (TextUtils.isEmpty(et1.getText().toString())) {
                   Toast.makeText(MainActivity.this, "输入名称不能为空", Toast.LENGTH_SHORT).show();
                   return;
               }
               Intent mIntent = new Intent(MainActivity.this, Main2Activity.class);
               mIntent.putExtra("intent", et1.getText().toString().trim());
               startActivityForResult(mIntent, 1000);
           }

           @Override
           protected void onActivityResult(int requestCode, int resultCold, Intent result) {
               MainActivity.super.onActivityResult(requestCode, resultCold, result);
               if (requestCode == REQUEST_CODE && resultCold == RESULT_CODE) {
                   String result_value = result.getStringExtra("result");
                   tv1.setText("评论内容返回为：" + result_value);
               }
           }
      

第二个activity的实现传回数据的代码

package com.example.zhoushasha.myapplication;

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

public class Main2Activity extends AppCompatActivity {
    private TextView tv1;
    private Button bt1;
    private Button bt2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        tv1= (TextView) findViewById(R.id.tv1);
        String userName = tv1.getText().toString();
        bt1 = (Button) findViewById(R.id.bt1);
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String result = "有";
                Intent intent = new Intent();
                intent.putExtra("result",result);
                setResult(MainActivity.RESULT_CODE,intent);
                finish();
            }

        });
        bt2= (Button) findViewById(R.id.bt2);
        bt2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String result = "没有";
                Intent intent = new Intent();
                intent.putExtra("result", result);
                setResult(MainActivity.RESULT_CODE,intent);
                finish();
            }
        });
    }
}