我尝试使用ItemTouchHelper的onChildDraw()方法根据滑动方式改变视图的颜色但是它不起作用:
@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
final View foregroundView = ((com.lab1.ac01220.bloomv2.ViewHolder) viewHolder).getForeground();
if(dX < 0){
this.mData.getViewHolder().getDeleteText().setVisibility(View.VISIBLE);
this.mData.getViewHolder().getCompleteText().setVisibility(View.INVISIBLE);
this.mData.getViewHolder().getBackground().setBackgroundColor(getResources().getColor(R.color.colorAccent));
} else if(dX >0){
this.mData.getViewHolder().getCompleteText().setVisibility(View.VISIBLE);
this.mData.getViewHolder().getDeleteText().setVisibility(View.INVISIBLE);
this.mData.getViewHolder().getBackground().setBackgroundColor(getResources().getColor(R.color.colorComplete));
}
ItemTouchHelper.SimpleCallback.getDefaultUIUtil().onDraw(c, recyclerView, foregroundView, dX, dY,
actionState, isCurrentlyActive);
}
问题在于,虽然有些观点有我试图设计的属性,但其他观点并不是,它们保持相同的颜色,文本视图保持可见。
我没有在onChildDrawOver中实现代码,因为我没有看到理由
答案 0 :(得分:1)
以下代码在向左或向右滑动时更改视图的颜色。它使用OnTouchListener和一些逻辑来区分左右滑动。我知道这与您的方法不同,但它可能会对您有所帮助。
public class demo4 extends AppCompatActivity{
private static final String TAG = "demo4";
private TextView tv;
private View demo4;
private float mDownMotionX = 0;
private float mDownMotionY = 0;
private final int SWIPE_SENSITIVITY = 10;
private final int SWIPE_Y_SENSITIVITY = 20;
private final int SWIPE_X_SENSITIVITY_MIN = 0;
private int SWIPE_X_SENSITIVITY_MAX = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.demo4);
LayoutInflater inflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
tv = (TextView) findViewById(R.id.tv);
SWIPE_X_SENSITIVITY_MAX = getScreenWidth();
Log.e("Swipe", ""+SWIPE_X_SENSITIVITY_MAX);
tv.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent ev) {
Log.e(TAG, "Touch View");
final int action = ev.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
// Remember where the motion event started
mDownMotionX = ev.getX();
mDownMotionY = ev.getY();
break;
case MotionEvent.ACTION_MOVE:
// Scroll to follow the motion event
final float x = ev.getX();
final float y = ev.getY();
if (Math.abs(x - mDownMotionX) >= SWIPE_SENSITIVITY &&
(mDownMotionX > SWIPE_X_SENSITIVITY_MIN &&
mDownMotionX <= SWIPE_X_SENSITIVITY_MAX) &&
Math.abs(y - mDownMotionY) <= SWIPE_Y_SENSITIVITY) {
if ((x - mDownMotionX) > 0) {
tv.setBackgroundColor(Color.RED);
Log.d(TAG, "Dragging right");
}
} else if ((x - mDownMotionX) < 0) {
tv.setBackgroundColor(Color.GRAY);
Log.d(TAG, "Dragging left");
}
break;
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_CANCEL:
break;
}
return true;
}
});
}
public int getScreenWidth(){
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
return displayMetrics.widthPixels;
}}
下面是布局xml代码:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<TextView
android:id="@+id/tv"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="@android:color/darker_gray"
android:gravity="center"
android:textSize="30sp"
android:text="x"/>
</LinearLayout>