Lesson 2 Activities

2.1: Membuat dan Memulai Aktivitas

Tugas 1. Membuat proyek TwoActivities

1.1 Membuat proyek TwoActivities

Menggunakan cara yang sama dengan pembuatan proyek sebelumnya

1.2 Definisikan layout untuk aktivitas utama

1.3 Mendefinisikan tindakan tombol

package com.example.safiraaini.twoactivities;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

public class MainActivity extends AppCompatActivity {
private static final String LOG_TAG =
MainActivity.class.getSimpleName();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

public void launchSecondActivity(View view) {
Log.d(LOG_TAG, “Button clicked!”);
}
}

Hasil :

Tugas 2. Membuat dan meluncurkan aktivitas kedua

2.1 Membuat aktivitas kedua

2.2 Memodifikasi manifes Android

<?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.safiraaini.twoactivities">
 
     <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=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <activity android:name=".SecondActivity"
             android:label="@string/activity2_name"
             android:parentActivityName=".MainActivity">
             <meta-data
                 android:name="android.support.PARENT_ACTIVITY"
                 android:value="com.example.safiraaini.twoactivities.MainActivity" />
         </activity>
     </application>
 
 </manifest>

2.3 Mendefinisikan layout untuk aktivitas utama

2.4 Menambahkan intent ke aktivitas utama

Pada MainActivity.java:

package com.example.safiraaini.twoactivities;
 
 import android.content.Intent;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 
 public class MainActivity extends AppCompatActivity {
     private static final String LOG_TAG = MainActivity.class.getSimpleName();
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
     }
 
     public void launchSecondActivity(View view) {
         Log.d(LOG_TAG, "Button clicked!");
         Intent intent = new Intent(this, SecondActivity.class);
         startActivity(intent);
     }
 
 }

Pada second_activity.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=”com.example.safiraaini.twoactivities.SecondActivity”>

Hasil :

Tugas 3. Mengirim data dari aktivitas utama ke aktivitas kedua

3.1 Menambahkan EditText ke layout aktivitas utama

3.2 Menambahkan string ke ekstra intent aktivitas utama

3.3 Menambahkan TextView ke aktivitas kedua untuk pesan

3.4 Memodifikasi aktivitas kedua untuk mendapatkan ekstra dan menampilkan pesan

package com.example.safiraaini.twoactivities;
 
 import android.content.Intent;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.widget.TextView;
 
 public class SecondActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_second);
         Intent intent = getIntent();
 
         String message =
                 intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
 
         TextView textView = (TextView) findViewById(R.id.text_Message);
         textView.setText(message);
     }
 }

Tugas 4. Mengembalikan data ke aktivitas utama

4.1 Menambahkan EditText dan Tombol ke layout aktivitas kedua

4.2 Membuat intent respons dalam aktivitas kedua

4.3 Menambahkan TextViews ke layout aktivitas utama untuk menampilkan balasan

Activity_main.xml :

<?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout 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="com.example.safiraaini.twoactivities.MainActivity">
 
     <TextView
         android:id="@+id/text_header_reply"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentLeft="true"
         android:layout_alignParentStart="true"
         android:layout_alignParentTop="true"
 
         android:text="@string/text_header_reply"
 
         android:textStyle="bold"
         android:visibility="invisible"
         />
 
     <TextView
         android:id="@+id/text_message_reply"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignEnd="@+id/text_header"
         android:layout_alignRight="@+id/text_header"
         android:layout_below="@+id/text_header_reply"
         android:layout_marginStart="20dp"
         android:layout_marginLeft="45dp"
 
         android:visibility="invisible"
         />
     <Button
         android:id="@+id/button_main"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentBottom="true"
         android:layout_alignParentEnd="true"
         android:layout_alignParentRight="true"
 
         android:layout_marginBottom="13dp"
         android:layout_marginEnd="18dp"
         android:layout_marginRight="18dp"
         android:onClick="launchSecondActivity"
         android:text="@string/button_main" />
 
     <EditText
         android:id="@+id/editText_main"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_toLeftOf="@+id/button_main"
         android:layout_toStartOf="@+id/button_main"
         android:layout_marginBottom="13dp"
         android:layout_marginLeft="18dp"
         android:layout_alignParentBottom="true"
         android:ems="10"
         android:inputType="textPersonName"
         android:hint="@string/editText_main" />
 </RelativeLayout>

Activity_second.xml

android:textStyle=”bold”
tools:layout_editor_absoluteX=”16dp”
tools:layout_editor_absoluteY=”6dp” />

<TextView
android:id=”@+id/text_Message”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_alignEnd=”@+id/text_header”
android:layout_alignRight=”@+id/text_header”
android:layout_below=”@+id/text_header”
android:layout_marginEnd=”45dp”
android:layout_marginRight=”45dp”

<Button
android:id=”@+id/button_second”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_alignParentBottom=”true”
android:layout_alignParentEnd=”true”
android:layout_alignParentRight=”true”

android:layout_marginBottom=”13dp”
android:layout_marginEnd=”18dp”
android:layout_marginRight=”18dp”
android:onClick=”returnReply”
android:text=”@string/button_second” />

</RelativeLayout>

MainActivity.java

package com.example.safiraaini.twoactivities;
 
 import android.content.Intent;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.TextView;
 
 
 public class MainActivity extends AppCompatActivity {
     private static final String LOG_TAG = MainActivity.class.getSimpleName();
 
     public static final String EXTRA_MESSAGE =
             "com.example.safiraaini.twoactivities.extra.MESSAGE";
 
     public static final int TEXT_REQUEST = 1;
 
     private EditText mMessageEditText;
     private TextView mReplyHeadTextView;
     private TextView mReplyTextView;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
         mMessageEditText = (EditText) findViewById(R.id.editText_main);
         mReplyHeadTextView = (TextView) findViewById(R.id.text_header_reply);
         mReplyTextView = (TextView) findViewById(R.id.text_message_reply);
 
         Log.d(LOG_TAG, "-------");
         Log.d(LOG_TAG, "onCreate");
 
         if (savedInstanceState != null) {
             boolean isVisible = savedInstanceState.getBoolean("reply_visible");
             // Show both the header and the message views. If isVisible is
             // false or missing from the bundle, use the default layout.
             if (isVisible) {
                 mReplyHeadTextView.setVisibility(View.VISIBLE);
 
                 mReplyTextView.setText(savedInstanceState.getString("reply_text"));
                 mReplyTextView.setVisibility(View.VISIBLE);
             }
         }
     }
     @Override
     public void onStart(){
         super.onStart();
         Log.d(LOG_TAG, "onStart");
     }
 
     @Override
     public void onRestart() {
         super.onRestart();
         Log.d(LOG_TAG, "onRestart");
     }
 
     @Override
     public void onResume() {
         super.onResume();
         Log.d(LOG_TAG, "onResume");
     }
 
     @Override
     public void onPause() {
         super.onPause();
         Log.d(LOG_TAG, "onPause");
     }
 
     @Override
     public void onStop() {
         super.onStop();
         Log.d(LOG_TAG, "onStop");
     }
 
     @Override
     public void onDestroy() {
         super.onDestroy();
         Log.d(LOG_TAG, "onDestroy");
     }
 
     @Override
     public void onSaveInstanceState(Bundle outState) {
         super.onSaveInstanceState(outState);
 
         // If the heading is visible, we have a message that needs to be saved.
         // Otherwise we're still using default layout.
         if (mReplyHeadTextView.getVisibility() == View.VISIBLE) {
             outState.putBoolean("reply_visible", true);
             outState.putString("reply_text", mReplyTextView.getText().toString());
         }
     }
 
     public void launchSecondActivity(View view) {
         Log.d(LOG_TAG, "Button clicked!");
         Intent intent = new Intent(this, SecondActivity.class);
 
         String message = mMessageEditText.getText().toString();
         intent.putExtra(EXTRA_MESSAGE, message);
         startActivityForResult(intent, TEXT_REQUEST);
     }
 
     public void onActivityResult(int requestCode, int resultCode,
                                  Intent data) {
         super.onActivityResult(requestCode, resultCode, data);
 
         if (requestCode == TEXT_REQUEST) {
             if (resultCode == RESULT_OK) {
                 String reply =
                         data.getStringExtra(SecondActivity.EXTRA_REPLY);
 
                 mReplyHeadTextView.setVisibility(View.VISIBLE);
                 mReplyTextView.setText(reply);
                 mReplyTextView.setVisibility(View.VISIBLE);
             }
         }
     }
 
 }

SecondActivity.java

package com.example.safiraaini.twoactivities;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class SecondActivity extends AppCompatActivity {

public static final String EXTRA_REPLY =
“com.example.safiraaini.twoactivities.extra.REPLY”;

private EditText mReply;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);

mReply = (EditText) findViewById(R.id.editText_second);
Intent intent = getIntent();

String message =
intent.getStringExtra(MainActivity.EXTRA_MESSAGE);

TextView textView = (TextView) findViewById(R.id.text_Message);
textView.setText(message);
}

private static final String LOG_TAG =
SecondActivity.class.getSimpleName();

public void returnReply(View view) {
String reply = mReply.getText().toString();
Intent replyIntent = new Intent();
replyIntent.putExtra(EXTRA_REPLY, reply);
setResult(RESULT_OK, replyIntent);
Log.d(LOG_TAG, “End SecondActivity”);
finish();
}

@Override
protected void onStart() {
super.onStart();
Log.d(LOG_TAG, “onStart”);
}

@Override
public void onRestart() {
super.onRestart();
Log.d(LOG_TAG, “onRestart”);
}

@Override
public void onResume() {
super.onResume();
Log.d(LOG_TAG, “onResume”);
}

@Override
public void onPause() {
super.onPause();
Log.d(LOG_TAG, “onPause”);
}

@Override
public void onStop() {
super.onStop();
Log.d(LOG_TAG, “onStop”);
}

@Override
public void onDestroy() {
super.onDestroy();
Log.d(LOG_TAG, “onDestroy”);
}
}

Hasil :

2.2: Siklus Hidup Aktivitas dan Status Instance

Tugas 1. Menambahkan Callback Siklus Hidup ke TwoActivities

1.2 Mengimplementasikan callback ke MainActivity

package com.example.safiraaini.twoactivities;
 
 import android.content.Intent;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.TextView;
 
 
 public class MainActivity extends AppCompatActivity {
     private static final String LOG_TAG = MainActivity.class.getSimpleName();
 
     public static final String EXTRA_MESSAGE =
             "com.example.safiraaini.twoactivities.extra.MESSAGE";
 
     public static final int TEXT_REQUEST = 1;
 
     private EditText mMessageEditText;
     private TextView mReplyHeadTextView;
     private TextView mReplyTextView;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
         mMessageEditText = (EditText) findViewById(R.id.editText_main);
         mReplyHeadTextView = (TextView) findViewById(R.id.text_header_reply);
         mReplyTextView = (TextView) findViewById(R.id.text_message_reply);
 
         Log.d(LOG_TAG, "-------");
         Log.d(LOG_TAG, "onCreate");
     }
     @Override
     public void onStart(){
         super.onStart();
         Log.d(LOG_TAG, "onStart");
     }
 
     @Override
     public void onRestart() {
         super.onRestart();
         Log.d(LOG_TAG, "onRestart");
     }
 
     @Override
     public void onResume() {
         super.onResume();
         Log.d(LOG_TAG, "onResume");
     }
 
     @Override
     public void onPause() {
         super.onPause();
         Log.d(LOG_TAG, "onPause");
     }
 
     @Override
     public void onStop() {
         super.onStop();
         Log.d(LOG_TAG, "onStop");
     }
 
     @Override
     public void onDestroy() {
         super.onDestroy();
         Log.d(LOG_TAG, "onDestroy");
     }
 
     public void launchSecondActivity(View view) {
         Log.d(LOG_TAG, "Button clicked!");
         Intent intent = new Intent(this, SecondActivity.class);
 
         String message = mMessageEditText.getText().toString();
         intent.putExtra(EXTRA_MESSAGE, message);
         startActivityForResult(intent, TEXT_REQUEST);
     }
 
     public void onActivityResult(int requestCode, int resultCode,
                                  Intent data) {
         super.onActivityResult(requestCode, resultCode, data);
 
         if (requestCode == TEXT_REQUEST) {
             if (resultCode == RESULT_OK) {
                 String reply =
                         data.getStringExtra(SecondActivity.EXTRA_REPLY);
 
                 mReplyHeadTextView.setVisibility(View.VISIBLE);
                 mReplyTextView.setText(reply);
                 mReplyTextView.setVisibility(View.VISIBLE);
             }
         }
     }
 
 }

1.3 Mengimplementasikan callback siklus hidup dalam SecondActivity

package com.example.safiraaini.twoactivities;
 
 import android.content.Intent;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.TextView;
 
 public class SecondActivity extends AppCompatActivity {
 
     public static final String EXTRA_REPLY =
             "com.example.safiraaini.twoactivities.extra.REPLY";
 
     private EditText mReply;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_second);
 
         mReply = (EditText) findViewById(R.id.editText_second);
         Intent intent = getIntent();
 
         String message =
                 intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
 
         TextView textView = (TextView) findViewById(R.id.text_Message);
         textView.setText(message);
     }
 
     private static final String LOG_TAG =
             SecondActivity.class.getSimpleName();
 
     public void returnReply(View view) {
         String reply = mReply.getText().toString();
         Intent replyIntent = new Intent();
         replyIntent.putExtra(EXTRA_REPLY, reply);
         setResult(RESULT_OK, replyIntent);
         Log.d(LOG_TAG, "End SecondActivity");
         finish();
     }
 
     @Override
     protected void onStart() {
         super.onStart();
         Log.d(LOG_TAG, "onStart");
     }
 
     @Override
     public void onRestart() {
         super.onRestart();
         Log.d(LOG_TAG, "onRestart");
     }
 
     @Override
     public void onResume() {
         super.onResume();
         Log.d(LOG_TAG, "onResume");
     }
 
     @Override
     public void onPause() {
         super.onPause();
         Log.d(LOG_TAG, "onPause");
     }
 
     @Override
     public void onStop() {
         super.onStop();
         Log.d(LOG_TAG, "onStop");
     }
 
     @Override
     public void onDestroy() {
         super.onDestroy();
         Log.d(LOG_TAG, "onDestroy");
     }
 }

Tugas 2. Menyimpan dan memulihkan status instance aktivitas.

2.1 Simpan status instance aktivitas dengan onSaveInstanceState()

2.2. Memulihkan status instance aktivitas dalam onCreate()

2.3: Memulai Aktivitas dengan Intent Implisit

Tugas 1. Membuat proyek dan layout baru

1.1 Membuat proyek

Tugas 2. Mengimplementasikan “buka situs web”

2.1 Mendefinisikan metode openWebsite

Tugas 3. Mengimplementasikan “buka lokasi”

3.1 Definisikan metode openLocation

Tugas 4. Mengimplementasikan bagikan teks ini

4.1 Mengimplementasikan metode shareText

Tugas 5. Menerima Intent Implisit

5.1 Membuat Proyek & Layout

5.2 Memodifikasi Manifes Android untuk menambahkan filter intent

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout 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:orientation="vertical"
     tools:context="com.example.safiraaini.implicitintents.MainActivity">
 
     <EditText
         android:id="@+id/website_edittext"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:ems="10"
         android:inputType="textPersonName"
         android:text="@string/edittext_uri"
         tools:layout_editor_absoluteX="16dp"
         tools:layout_editor_absoluteY="16dp" />
 
     <Button
         android:id="@+id/button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/open_website_button"
         tools:layout_editor_absoluteX="16dp"
         tools:layout_editor_absoluteY="62dp"
         android:layout_marginBottom="24dp"
         android:onClick="openWebsite"/>
 
     <EditText
         android:id="@+id/location_edittext"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:ems="10"
         android:inputType="textPersonName"
         android:text="@string/edittext_loc"
         tools:layout_editor_absoluteX="16dp"
         tools:layout_editor_absoluteY="123dp" />
 
     <Button
         android:id="@+id/open_location_button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/button_loc"
         tools:layout_editor_absoluteX="16dp"
         tools:layout_editor_absoluteY="169dp"
         android:onClick="openLocation"/>
 
     <EditText
         android:id="@+id/share_edittext"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:ems="10"
         android:inputType="textPersonName"
         android:text="@string/edittext_share"
         tools:layout_editor_absoluteX="16dp"
         tools:layout_editor_absoluteY="232dp" />
 
     <Button
         android:id="@+id/share_text_button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/button_share"
         tools:layout_editor_absoluteX="16dp"
         tools:layout_editor_absoluteY="278dp"
         android:onClick="shareText"/>
 
 </LinearLayout>

MainActivity.java

package com.example.safiraaini.implicitintents;
 
 import android.content.Intent;
 import android.net.Uri;
 import android.support.v4.app.ShareCompat;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.widget.EditText;
 
 public class MainActivity extends AppCompatActivity {
     private EditText mWebsiteEditText;
     private EditText mLocationEditText;
     private EditText mShareTextEditText;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
         mWebsiteEditText = (EditText) findViewById(R.id.website_edittext);
         mLocationEditText = (EditText) findViewById(R.id.location_edittext);
         mShareTextEditText = (EditText) findViewById(R.id.share_edittext);
 
     }
 
     public void openWebsite(View view) {
         String url = mWebsiteEditText.getText().toString();
 
         // Parse the URI and create the intent.
         Uri webpage = Uri.parse(url);
         Intent intent = new Intent(Intent.ACTION_VIEW, webpage);
 
         // Find an activity to hand the intent and start that activity.
         if (intent.resolveActivity(getPackageManager()) != null) {
             startActivity(intent);
         } else {
             Log.d("ImplicitIntents", "Can't handle this intent!");
         }
     }
 
     public void openLocation(View view) {
         String loc = mLocationEditText.getText().toString();
 
         // Parse the location and create the intent.
         Uri addressUri = Uri.parse("geo:0,0?q=" + loc);
         Intent intent = new Intent(Intent.ACTION_VIEW, addressUri);
 
         // Find an activity to handle the intent, and start that activity.
         if (intent.resolveActivity(getPackageManager()) != null) {
             startActivity(intent);
         } else {
             Log.d("ImplicitIntents", "Can't handle this intent!");
         }
     }
 
     public void shareText(View view) {
         String txt = mShareTextEditText.getText().toString();
         String mimeType = "text/plain";
 
         ShareCompat.IntentBuilder
                 .from(this)
                 .setType(mimeType)
                 .setChooserTitle("Share this text with: ")
                 .setText(txt)
                 .startChooser();
     }
 }