FindViewById
activity_xml
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19 | <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="com.gclue.uisample.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="@+id/testView1"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
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android:idでTextViewに名前をつけます。
| android:id="@+id/testView1"
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こうすることで、プログラムからは、
でXMLで記述されたViewをプログラムに取り込むことが可能になります。
http://developer.android.com/intl/ja/reference/android/view/View.html
MainActivity.java
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36 | package com.gclue.uisample;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
/**
* Skeleton of an Android Things activity.
* <p>
* Android Things peripheral APIs are accessible through the class
* PeripheralManagerService. For example, the snippet below will open a GPIO pin and
* set it to HIGH:
* <p>
* <pre>{@code
* PeripheralManagerService service = new PeripheralManagerService();
* mLedGpio = service.openGpio("BCM6");
* mLedGpio.setDirection(Gpio.DIRECTION_OUT_INITIALLY_LOW);
* mLedGpio.setValue(true);
* }</pre>
* <p>
* For more complex peripherals, look for an existing user-space driver, or implement one if none
* is available.
*
* @see <a href="https://github.com/androidthings/contrib-drivers#readme">https://github.com/androidthings/contrib-drivers#readme</a>
*/
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView mTextView = (TextView) findViewById(R.id.testView1);
mTextView.setText("TEST Writing");
}
}
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TextViewの背景に色をつける
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20 | <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="com.gclue.uisample.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="@+id/testView1"
android:background="#ff0000"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
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TextViewの文字に色をつける
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21 | <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="com.gclue.uisample.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="@+id/testView1"
android:background="#ff0000"
android:textColor="#00ff00"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
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TEXTのサイズを変える
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22 | <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="com.gclue.uisample.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="@+id/testView1"
android:background="#ff0000"
android:textColor="#00ff00"
android:textSize="100px"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
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TextViewのサイズを変える
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22 | <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="com.gclue.uisample.MainActivity">
<TextView
android:layout_width="200px"
android:layout_height="200px"
android:text="Hello World!"
android:id="@+id/testView1"
android:background="#ff0000"
android:textColor="#00ff00"
android:textSize="100px"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
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