Android-----------跳转与数据传递

界面一Java

package com.example.myapplication;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
 
public class AActivity extends AppCompatActivity {
    private Button btn_a;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_a);
        btn_a=findViewById(R.id.btn_a);
        btn_a.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent=new Intent(AActivity.this,BActivity.class);
                Bundle bundle=new Bundle();
                bundle.putString("name","zhangsan");
                bundle.putInt("number",20);
                intent.putExtras(bundle);
                startActivity(intent);
            }
        });
    }
}

　　界面一XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
  <Button
      android:id="@+id/btn_a"
      android:layout_marginTop="200dp"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="跳转到下一界面"
      android:layout_gravity="center"/>
  <TextView
      android:layout_marginTop="50dp"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:text="点击跳转到下一界面 这里会传递两个数：zhangsan,20"
      android:textSize="20dp"
      />
</LinearLayout>

　　界面二JAVA

package com.example.myapplication;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.os.Bundle;
import android.widget.TextView;
 
public class BActivity extends AppCompatActivity {
       private TextView tv_b;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_b);
        tv_b=findViewById(R.id.tv_b);
       Bundle bundle=getIntent().getExtras();
       String name = bundle.getString("name");
       int number = bundle.getInt("number");
 
       tv_b.setText(name+","+number);
    }
}

　　界面二XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
 
    <TextView
        android:id="@+id/tv_b"
        android:layout_marginTop="200dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#000000"
        android:textSize="20dp"
        />
 
</LinearLayout>