无法在画布上绘图和聆听触摸以同时查看

Question

我的主活动包含一个textView。如果触摸，它确实会运行动画。在同一个屏幕上，我可以画一条带扩展视图的线(示例(。

画布上的OnTouchEvent必须返回true，但textView中的onTouch永远不会得到它。

我想让触摸屏同时适用于两者。我该怎么做？

主要活动.java

public class MainActivity extends AppCompatActivity {
TextView tv,lettres;
TranslateAnimation animation;
ConstraintLayout constraintLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = findViewById(R.id.tv);
tv.setX(100);
tv.setY(100);
constraintLayout = findViewById(R.id.cl);
lettres = new TextView(this);
constraintLayout.addView(lettres);
lettres.setVisibility(View.GONE);
lettres.setText("test");
tv.setOnTouchListener(touchListener);
}
private View.OnTouchListener touchListener = new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (view == tv){
lettres.setX(50);
lettres.setY(50);
animation = new TranslateAnimation(0,10,0,10);
lettres[i].startAnimation(animation[i]);
}
return false;
}
};
}

activity_main。XML

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:id="@+id/cl"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
<fr.DrawingView
android:id="@+id/myDrawingView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

DrawingView.java

public class DrawingView extends View {
Paint myPaint;
int debutX=0;
int debutY=0;
int finX=0;
int finY=0;
public DrawingView(Context context, AttributeSet attributeSet) {
super(context,attributeSet);
myPaint = new Paint();
myPaint.setColor(Color.RED);
myPaint.setStyle(Paint.Style.FILL_AND_STROKE);
myPaint.setStrokeWidth(20);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawLine(debutX, debutY, finX, finY, myPaint);
invalidate();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
debutX = (int) event.getX();
debutY = (int) event.getY();
finX = (int) event.getX();
finY = (int) event.getY();
invalidate();
break;
case MotionEvent.ACTION_MOVE:
finX = (int) event.getX();
finY = (int) event.getY();
invalidate();
break;
case MotionEvent.ACTION_UP:
invalidate();
break;
}
return true;
}
}

Answer 1

因为您的主布局会消耗触摸事件。并且您在TouchEvent 内部返回true