XML
<?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:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="lesson10.computer.app3.MainActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="这是主界面" android:textSize="20sp" android:layout_margin="8dp" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="8dp" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="跳转界面返回的值是:" android:textSize="20sp" /> <TextView android:id="@+id/tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="测试值" android:textSize="20sp" /> </LinearLayout> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="点我跳转到1" android:layout_gravity="center_horizontal" android:onClick="jumpMethod1" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="点我跳转到2" android:layout_gravity="center_horizontal" android:onClick="jumpMethod2" /> </LinearLayout>跳转界面XML
<?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:layout_width="match_parent" android:layout_height="match_parent" android:paddingTop="@dimen/activity_vertical_margin" android:orientation="vertical" tools:context="lesson10.computer.app3.JumpActivity1"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="8dp" android:text="这是跳转页面1" android:textSize="20sp" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="8dp" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="返回值1" android:textSize="20sp" /> <EditText android:id="@+id/et_param1" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入返回值1" android:textSize="20sp" android:textColorHint="@color/colorAccent" android:background="@null" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="8dp" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="返回值2" android:textSize="20sp" /> <EditText android:id="@+id/et_param2" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入返回值2" android:textSize="20sp" android:textColorHint="@color/colorAccent" android:background="@null" /> </LinearLayout> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="返回主界面" android:onClick="returnMethod" android:layout_gravity="center_horizontal" /> </LinearLayout>Main后台代码
package lesson10.computer.app3; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private final int REQUEST_CODE_1 = 1; private final int REQUEST_CODE_2 = 2; private TextView value; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init(); } private void init() { value = (TextView) findViewById(R.id.tv); } /** * 跳转按钮的事件处理函数 * @param v */ public void jumpMethod1(View v){ Intent intent = new Intent(this,JumpActivity1.class); //有返回值，启用此函数，第二给值requestCode,接收返回值用这个值 startActivityForResult(intent,REQUEST_CODE_1); } /** * 跳转按钮的事件处理函数 * @param v */ public void jumpMethod2(View v){ } @Override //只要有返回值则会触发此函数，通过requestCode判断是谁给的 protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode){ //REQUEST_CODE_1，表示第一个画面因为，jumpMethod1是第一个画面的点击事件 case REQUEST_CODE_1: if(resultCode == Utils.RESULT_OK) { //获取返回值 String rtn1 = data.getStringExtra("rtn1"); String rtn2 = data.getStringExtra("rtn2"); value.setText(rtn1 +" " + rtn2); } else // TODO: 2020/10/20 Toast.makeText(MainActivity.this, "操作失败!", Toast.LENGTH_SHORT).show(); break; case REQUEST_CODE_2: // TODO: 2020/10/20 break; } super.onActivityResult(requestCode, resultCode, data); } }JumpActivity1
package lesson10.computer.app3; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.EditText; public class JumpActivity1 extends AppCompatActivity { private EditText et_param1; private EditText et_param2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_jump1); init(); } private void init() { et_param1 = (EditText) findViewById(R.id.et_param1); et_param2 = (EditText) findViewById(R.id.et_param2); } public void returnMethod(View v){ Intent intent = new Intent(this,MainActivity.class); intent.putExtra("rtn1",et_param1.getText().toString()); intent.putExtra("rtn2",et_param2.getText().toString()); setResult(Utils.RESULT_OK,intent); //设置返回值，Utils为静态直接用就行不需要实例化 finish(); } }Utiles
package lesson10.computer.app3; /** * Created by dell-pc on 2020/10/20. */ public class Utils { //final常量别人不可以修改,static直接用就行，不用实例化 public static final int RESULT_OK=1; public static final int RESULT_ERR=0; }