Android Intent-filters
An instance of the Intent-filter class is an intent filter. While using implicit intents, intent filters are useful. Because they cannot be handled in Java code, we must set them up in AndroidManifest.xml. Intent filters provide Android with information about intent and actions because Android needs to know what kind of intent it is launching.
1. Create a new project and write the code inside the activity_main.xml.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 |
<?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" tools:context=".MainActivity"> <Button android:id="@+id/buton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout> |
2. Action performed on the button click in the MainActivity.java write the below code.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 |
package com.example.intentfilter; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.RadioButton; public class MainActivity extends AppCompatActivity { RadioButton radioButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final Button button = findViewById(R.id.buton); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(Intent.ACTION_SEND); intent.setType("message/rfc822"); intent.putExtra(Intent.EXTRA_EMAIL, new String[]{"contact@tutorialspoint.com"}); intent.putExtra(Intent.EXTRA_SUBJECT, "Welcome to tutorialspoint.com"); startActivity(Intent.createChooser(intent, "Choose default Mail App")); } }); } } |
3. Add the code in the manifest.xml.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 |
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools"> <application android:allowBackup="true" android:dataExtractionRules="@xml/data_extraction_rules" android:fullBackupContent="@xml/backup_rules" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/Theme.IntentFilter" tools:targetApi="31"> <activity android:name=".MainActivity" android:exported="true"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> <action android:name="android.intent.action.SEND" /> <category android:name="android.intent.category.DEFAULT" /> <data android:mimeType="message/rfc822" /> </intent-filter> </activity> </application> </manifest> |
