ที่ MainActivity ให้เรียก SecondActivity ด้วย startActivityForResult()
และรอรับข้อมูลกลับมาด้วย onActivityResult()
ไฟล์ที่เกี่ยวข้อง
- AndroidManifest.xml
- activity_main.xml
- MainActivity.java
- activity_second.xml
- SecondActivity.java
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:dist="http://schemas.android.com/apk/distribution" package="com.phaisarn.myapplication"> <dist:module dist:instant="true" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".SecondActivity" android:parentActivityName=".MainActivity"></activity> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
activity_main.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=".MainActivity"> <Button android:id="@+id/button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Call Second Activity" /> </LinearLayout>
MainActivity.java
package com.phaisarn.myapplication; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity { public final static String MESSAGE2 = "Message2"; public static final int CODE = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button = findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(getApplicationContext(), SecondActivity.class); startActivityForResult(intent, CODE); } }); } @Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == CODE) { if (resultCode == RESULT_OK) { String msg = data.getStringExtra(MESSAGE2); Toast.makeText(this, msg, Toast.LENGTH_SHORT).show(); } } } }
activity_second.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" tools:context=".SecondActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal"> <EditText android:id="@+id/editText" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:hint="Text Me" android:text="Hello MainActivity" /> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Send" /> </LinearLayout> </LinearLayout>
SecondActivity.java
package com.phaisarn.myapplication; 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; public class SecondActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); final EditText editText = findViewById(R.id.editText); Button button = findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String msg = editText.getText().toString(); Intent intent = new Intent(); intent.putExtra(MainActivity.MESSAGE2, msg); setResult(RESULT_OK, intent); finish(); } }); } }
บรรทัดที่ 29: finish()
เป็นการกำหนดให้ SecondActivity นี้ทำงานเสร็จสิ้น ให้ปิดทันที