我试图在单击按钮时刷新屏幕,所以我想知道我应该在 OnClick() 方法中编写什么,以便自定义 View (即 TouchEventView)将重新加载或刷新,这是我的代码 TouchEventView.java
public class TouchEventView extends View {
private Paint paint = new Paint();
private Path path = new Path();
public TouchEventView(Context context, AttributeSet attrs) {
super(context, attrs);
paint.setAntiAlias(true);
paint.setColor(Color.WHITE);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(5f);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawPath(path, paint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float eventX = event.getX();
float eventY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
path.moveTo(eventX, eventY);
return true;
case MotionEvent.ACTION_MOVE:
path.lineTo(eventX, eventY);
break;
case MotionEvent.ACTION_UP:
// nothing to do
break;
default:
return false;
}
// Schedules a repaint.
invalidate();
return true;
}
}
`
这里是 main.xml 文件``
<de.vogella.android.touch.TouchEventView
android:id="@+id/mydrawview1"
android:layout_width="wrap_content"
android:layout_height="328dp"
android:layout_weight="0.91" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/reset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Reset" />
</LinearLayout>
</LinearLayout>`
这里是 Activity 类`
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button res = (Button) findViewById(R.id.reset);
res.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
TouchEventView touchView = (TouchEventView) findViewById(R.id.mydrawview1);
touchView.clear();
}
});
}
}`
最佳答案
只需将此方法添加到您的 TouchEventView
中即可:
public void clear ()
{
path = new Path();
invalidate();
}
然后从onClick()
调用它:
@Override
public void onClick(View v) {
TouchEventView touchView = (TouchEventView) findViewById(R.id.mydrawview1);
touchView.clear();
}
关于android - 单击按钮时重新加载自定义 View ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11115809/