[Android] TextView 文字元件

TextView text;//宣告

text = (TextView)findViewById(R.id.text);

text.setText("裡面放置文字");//設置文字

text.setTextColor(Color.RED);//設置文字顏色

text.setTextColor(Color.rgb(255,255,255));//設置文字顏色

text.setTextSize(10);//設置文字字體大小

範例

XML

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=".MainActivity">

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="text1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/text2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="text2"
        app:layout_constraintStart_toEndOf="@+id/text"
        app:layout_constraintTop_toTopOf="parent" />

android.support.constraint.ConstraintLayout>

JAVA

public class MainActivity extends AppCompatActivity {
TextView text,text2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
text = (TextView)findViewById(R.id.text);
text2 = (TextView)findViewById(R.id.text2);

text.setText("987654321");
text2.setText("123456789");

text.setTextColor(Color.RED);
text2.setTextColor(Color.rgb(255,0,0));

text.setTextSize(10);
text2.setTextSize(30);
    }
}