Zi 字媒體

示範 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" > android.support.constraint.ConstraintLayout> JAVA public class MainActivity extends AppCompatActivity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new Panel(this)); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); } class Panel extends View { public Panel(Context context) { super(context); } public void onDraw(Canvas canvas) { Paint paint = new Paint(); paint.setColor(Color.BLUE); paint.setStyle(Paint.Style.STROKE); paint.setTextSize(100); canvas.drawLine(1000, 1000, 0, 0, paint); canvas.drawRect(500, 500, 1000, 1000, paint); canvas.drawCircle(500, 500, 400, paint); canvas.drawText("Hello!", 500, 600, paint); } } } 展示 相關文章: [Android] Android 程式設計教學