Android stutio实现Activity数据传递和回传

实验二：Android stutio实现Activity数据传递和回传

本次实验需要两个界面来回传递

 activity_main.xml文件代码：

 activity_main2.xml文件代码：

MainActivity.java文件代码：

package com.example.a86761.datazdj;

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.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
    TextView tv3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tv3 = findViewById(R.id.textView3);
        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, Main2Activity.class);
                startActivityForResult(intent,1);
            }
        });
    }
    protected void onActivityResult(int requestCode,int resultCode,Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 1 && resultCode == 2) {
            String data1 = data.getStringExtra("data");
            tv3.setText(data1);
        }
    }
}

Main2Activity.java文件代码：

package com.example.a86761.datazdj;

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.EditText;
import android.widget.TextView;
public class Main2Activity extends AppCompatActivity {
EditText tv;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        tv = findViewById(R.id.data1);
        Button button1 = findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {
                String data1 =tv.getText().toString();
                Intent intent = new Intent();
                intent.putExtra("data",data1);
                setResult(2,intent);
                finish();
            }
        });


    }
}

运行结果：