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   源码介绍

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 在AndroidManifest.xml文件中配置SecondActivity：

配置Intent的Action属性为com.sise.intent.action.JHY_ACTION；

配置Category属性为com.sise.intent.category.JHY_CATEGORY。使用显式Intent启动SecondActivity，并使用Intent从FirstActiv传递数据到SecondActivity。使用Intent传递数据从SecondActivity返回数据到FirstActivity中去。编写代码，运行程序。

 

Activity_third.xml

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="@dimen/box_inset_layout_padding"     tools:context=".ThirdActivity"     tools:deviceIds="wear">     <TextView         android:id="@ id/textView"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginTop="20dp"         android:text="Action为：com.sise.intent.action.JHY_ACTION"         app:layout_constraintEnd_toEndOf="parent"         app:layout_constraintStart_toStartOf="parent"         app:layout_constraintTop_toTopOf="parent" />     <TextView         android:id="@ id/textView2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginTop="16dp"         android:text="Gategory属性为：[com.sise.intent.category.JHY_GATEGORY]"         app:layout_constraintEnd_toEndOf="parent"         app:layout_constraintHorizontal_bias="0.501"         app:layout_constraintStart_toStartOf="parent"         app:layout_constraintTop_toBottomOf="@ id/textView" />     <Button         android:id="@ id/button_back"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginStart="159dp"         android:layout_marginEnd="159dp"         android:text="返回主页面"         app:layout_constraintEnd_toEndOf="parent"         app:layout_constraintStart_toStartOf="parent"         app:layout_constraintTop_toBottomOf="@ id/textView2" />









</androidx.constraintlayout.widget.ConstraintLayout>

Activity_second.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="@dimen/box_inset_layout_padding"     tools:context=".SecondActivity"     tools:deviceIds="wear">     <LinearLayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="vertical">         <EditText             android:id="@ id/editText1"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:text="Hello_world" />         <Button             android:id="@ id/button_back"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:text="Button back" />     </LinearLayout>





</RelativeLayout>

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context=".MainActivity">     <LinearLayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="vertical">         <Button             android:id="@ id/button_1"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:text="启动指定Action、指定Gategory对应的Activity" />         <Button             android:id="@ id/button_2"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:text="传递数据：Hello word" />         <LinearLayout             android:layout_width="match_parent"             android:layout_height="match_parent"             android:orientation="horizontal">             <TextView                 android:id="@ id/textView"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="结果显示：" />             <EditText                 android:id="@ id/editText1"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content" />         </LinearLayout>     </LinearLayout>



</RelativeLayout>

3.源程序

ThirdActivity.java

package com.example.intenttest;



import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;



public class ThirdActivity extends Activity {     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_third);         setTitle("Intent传递数据");         Button button = (Button)findViewById(R.id.button_back);         button.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 Toast.makeText(ThirdActivity.this,"You Click Button 2",Toast.LENGTH_SHORT).show();                 finish();             }         });     }

}

SecondActivity.java

package com.example.intenttest;



import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;



public class SecondActivity extends Activity {     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);        // requestWindowFeature(Window.FEATURE_NO_TITLE);         setContentView(R.layout.activity_second);         EditText editText = (EditText)findViewById(R.id.editText1);         Button button = (Button)findViewById(R.id.button_back);         button.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 String result = editText.getText().toString();                 Intent intent = new Intent();                 intent.putExtra("result",result);                 setResult(1001,intent);                 finish();             }         });     }

}

MainActivity.java

package com.example.intenttest;



import androidx.appcompat.app.AppCompatActivity;



import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;



public class MainActivity extends AppCompatActivity {     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         setTitle("软件1801贺佳诚1811030107");         Button button1 = (Button) findViewById(R.id.button_1);         button1.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 Toast.makeText(MainActivity.this, "You Click Button 2", Toast.LENGTH_SHORT).show();                 Intent intent = new Intent("com.example.activitytest.ACTION_START");                 intent.addCategory("com.example.activitytest.MY_CATEGORY");                 startActivity(intent);             }         });         Button button2 = (Button) findViewById(R.id.button_2);         button2.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 Toast.makeText(MainActivity.this, "传递数据：Hello word", Toast.LENGTH_SHORT).show();                 Intent intent = new Intent(MainActivity.this, SecondActivity.class);                 startActivityForResult(intent,1000);             }         });     }     @Override     protected void onActivityResult(int requestCode, int resultCode, Intent data) {         super.onActivityResult(requestCode, resultCode, data);         EditText editText = (EditText) findViewById(R.id.editText1);         if (requestCode == 1000 && resultCode == 1001) {             String result_value = data.getStringExtra("result");             editText.setText(result_value);         }     }



}