Android中view的简单应用---随手指移动的小球
16lz
2021-01-23
public class DrawView extends View{ public float currentX=40; public float currentY=50; public DrawView(Context context){ super(context); } //重写ondraw,通过canvas绘画 protected void onDraw(Canvas canvas){ Paint paint=new Paint(); paint.setColor(Color.RED); canvas.drawCircle(currentX,currentY,25,paint); }
<?xml version="1.0" encoding="utf-8"?>
public class MainActivity extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); LinearLayout root=(LinearLayout) findViewById(R.id.root); final DrawView drawView=new DrawView(this); WindowManager wm = this.getWindowManager(); int width = wm.getDefaultDisplay().getWidth(); int height = wm.getDefaultDisplay().getHeight(); Toast.makeText(this,"width is"+width+"height"+height,Toast.LENGTH_LONG).show(); drawView.setMinimumHeight(300); drawView.setMinimumHeight(500); drawView.setOnTouchListener(new View.OnTouchListener(){ @Override public boolean onTouch(View v, MotionEvent event) { drawView.currentX=event.getX(); drawView.currentY=event.getY(); drawView.invalidate(); return true; } }); root.addView(drawView); }}
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