24 得到Activity返回的数据

得到Activity返回的数据

 相关代码及截图：

MainActivity.java

package com.example.getbackdata;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    public final static int REUEST_CODE=1;

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

    public void btn_start_otherActivity(View view) {
        //步骤一
        Intent intent=new Intent(this,OtherActivity.class);
        startActivityForResult(intent,REUEST_CODE);
    }
　　　　　
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode){
            case REUEST_CODE:
                TextView textView = findViewById(R.id.textView);
                textView.setText(data.getStringExtra("result"));
            default:
                break;

        }
    }

}

OtherActivity.java

package com.example.getbackdata;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class OtherActivity extends AppCompatActivity {

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

    public void btn_back(View view) {
        //步骤二
        EditText editText=findViewById(R.id.editText);
        Intent intent=new Intent();
        intent.putExtra("result",editText.getText().toString());
        this.setResult(0,intent);
        finish();
    }
}

运行截图：

1.初识界面

2.启动OtherActivity

 3.返回界面