22级云计算杜陈阳2022005011移动应用程序开发基础.zip

package com.example.myapplication2; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import androidx.activity.EdgeToEdge; import androidx.activity.result.ActivityResultLauncher; import androidx.activity.result.contract.ActivityResultContracts; import androidx.appcompat.app.AppCompatActivity; import androidx.core.graphics.Insets; import androidx.core.view.ViewCompat; import androidx.core.view.WindowInsetsCompat; public class MainActivity028 extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main028); //获取文本框中的值 //点击按钮跳转到29页面 //29页面要显示：xx登录成功 //点击29按钮，回到主页面28要显示xx已经登录成功 EditText txtname=findViewById(R.id.editTextText3); TextView txtState=findViewById(R.id.textView6); Button btn=findViewById(R.id.button5); //定义一个可以结束返回值的意图对象intent(在该意图被关掉后，获取一个返回值) ActivityResultLauncher intentActivityResultLauncher= registerForActivityResult(new ActivityResultContracts.StartActivityForResult(), result -> { if (result.getResultCode()==1) { txtState.setText(result.getData().getStringExtra("result")); } }); btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent=new Intent(MainActivity028.this,MainActivity029.class); intent.putExtra("loginname",txtname.getText().toString()); intentActivityResultLauncher.launch(intent); } }); } }