Parcelableの実装確認用

Author: 柳澤 雄高

StudyAplication/app/src/main/java/app/maruty/com/studyaplication/MainActivity.java

@@ -19,17 +19,26 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        //ライフサイクル確認用
         Toast.makeText(this.getApplicationContext(),"onCreate", Toast.LENGTH_SHORT).show();
+
+        //各種ボタンのオブジェクト
         Button button1 = (Button)findViewById(R.id.button01);
         Button button2 = (Button)findViewById(R.id.button02);
+        Button button3 = (Button)findViewById(R.id.button03);
+
+        //各種ボタンのリスナー
         button1.setOnClickListener(this);
         button2.setOnClickListener(this);
+        button3.setOnClickListener(this);
 
     }
 
     @Override
     protected void onStart() {
         super.onStart();
+        //ライフサイクル確認用
         Toast.makeText(this.getApplicationContext(),"onStart", Toast.LENGTH_SHORT).show();
 
     }
@@ -38,48 +47,63 @@ protected void onStart() {
     @Override
     protected void onResume(){
         super.onResume();
+        //ライフサイクル確認用
         Toast.makeText(this.getApplicationContext(),"onResume", Toast.LENGTH_SHORT).show();
 
     }
 
     @Override
     protected void onPause(){
         super.onPause();
+        //ライフサイクル確認用
         Toast.makeText(this.getApplicationContext(),"onPause", Toast.LENGTH_SHORT).show();
 
     }
 
     @Override
     protected void onStop() {
         super.onStop();
+        //ライフサイクル確認用
         Toast.makeText(this.getApplicationContext(),"onStop", Toast.LENGTH_SHORT).show();
 
     }
 
     @Override
     protected void onDestroy() {
         super.onDestroy();
+        //ライフサイクル確認用
         Toast.makeText(this.getApplicationContext(),"onDestroy", Toast.LENGTH_SHORT).show();
 
     }
 
     @Override
     protected void onRestart() {
         super.onRestart();
+        //ライフサイクル確認用
         Toast.makeText(this.getApplicationContext(),"onRestart", Toast.LENGTH_SHORT).show();
     }
 
     public void onClick(View v){
         switch (v.getId()) {
             case R.id.button01:
+                //明示的インテントサンプル
                 Intent intent1 = new Intent(this , SubActivity.class);
                 intent1.putExtra("data","100");
                 startActivity(intent1);
                 break;
             case R.id.button02:
+                //暗黙的インテントサンプル
                 Uri uri = Uri.parse("http://google.com");
                 Intent intent2 = new Intent(Intent.ACTION_VIEW,uri);
                 startActivity(intent2);
+                break;
+            case R.id.button03:
+                //Parcelableサンプル
+                SampleParcelable sampleParcelable = new SampleParcelable();
+                Intent intent3 = new Intent(this, SubActivity.class);
+                intent3.putExtra("parcelable",sampleParcelable);
+                startActivity(intent3);
+                break;
 
             default:
                 break;

StudyAplication/app/src/main/java/app/maruty/com/studyaplication/SampleParcelable.java

@@ -0,0 +1,47 @@
+package app.maruty.com.studyaplication;
+
+
+import android.os.Parcel;
+import android.os.Parcelable;
+
+public class SampleParcelable implements Parcelable{
+
+
+    public String sampleParcelableVariable = "unko";
+
+
+    //コンストラクタ
+    protected SampleParcelable() {
+
+    }
+
+    //コンストラクタ
+    protected SampleParcelable(Parcel in) {
+        sampleParcelableVariable = in.readString();
+    }
+
+    //Interfaceの実装
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    //Interfaceの実装
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeString(sampleParcelableVariable);
+    }
+
+    //Interfaceの実装
+    public static final Creator<SampleParcelable> CREATOR = new Creator<SampleParcelable>() {
+        @Override
+        public SampleParcelable createFromParcel(Parcel in) {
+            return new SampleParcelable(in);
+        }
+
+        @Override
+        public SampleParcelable[] newArray(int size) {
+            return new SampleParcelable[size];
+        }
+    };
+}

StudyAplication/app/src/main/java/app/maruty/com/studyaplication/SubActivity.java

@@ -1,21 +1,50 @@
 package app.maruty.com.studyaplication;
 
+import android.annotation.SuppressLint;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.widget.TextView;
 
 public class SubActivity extends AppCompatActivity {
 
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-        Intent intent = getIntent();
-        String number = intent.getStringExtra("data");
 
+
+        /*
+            Bundle or Intent
+            Intentの内部にBundleを保持
+         */
+
+
+        String number ="";
+        SampleParcelable sampleParcelable = new SampleParcelable();
         TextView textView = (TextView) findViewById(R.id.text);
 
-        textView.setText("SubActivity" + number);
+        textView.setText("SubActivity");
+        //IntentでもらうパターンBundleから取り出すやり方
+        Intent intent = getIntent();
+        Bundle extras = getIntent().getExtras();
+
+        if(extras.containsKey("data")){
+
+            //Intentから
+            number = intent.getStringExtra("data");
+            textView.setText(textView.getText() + number);
+
+        }
+        if(extras.containsKey("parcelable")){
+            //Bundleから
+            sampleParcelable = (SampleParcelable) extras.getParcelable("parcelable");
+
+            TextView textView01 = (TextView)findViewById(R.id.text01);
+            textView01.setText(sampleParcelable.sampleParcelableVariable);
+
+        }
+
     }
 }

StudyAplication/app/src/main/res/layout/activity_main.xml

@@ -22,6 +22,13 @@
             android:text="MainActivity"
             tools:ignore="HardcodedText"/>
 
+        <TextView
+            android:id="@+id/text01"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="parcelable表示確認"
+            tools:ignore="HardcodedText"/>
+
         <Button
             android:id="@+id/button01"
             android:layout_width="wrap_content"
@@ -35,5 +42,12 @@
             android:layout_height="wrap_content"
             android:text="暗黙的intent"
             tools:ignore="HardcodedText"/>
+
+        <Button
+            android:id="@+id/button03"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="parcelable確認"
+            tools:ignore="HardcodedText"/>
     </LinearLayout>
 </LinearLayout>