java-选择时如何更改卡片视图的颜色

我正在尝试卡片视图而不是按钮视图,我喜欢可以添加到他们的信息量.但是我想这样做,所以如果他们按卡片,它就会变色.一旦发布,我希望它变回来.因此它的工作方式与我的按钮类似.

我可以得到它,以便它在单击时发生变化,但是直到活动被破坏之前,它都保持不变,

这是我目前用于更改颜色的代码.

public void setSingleEvent(GridLayout maingrid) {
    for (int i = 0; i < maingrid.getChildCount(); i++) {
        final CardView cardView = (CardView) maingrid.getChildAt(i);
        final int finalI = i;
        cardView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(mcontext, "Button: " + finalI, Toast.LENGTH_SHORT).show();
                cardView.setCardBackgroundColor(mcontext.getResources().getColor(R.color.buttonPressed));
                if (finalI == 0) {
                    mcontext.startActivity(new Intent(mcontext, Genre_Streaming.class));
                }
            }
        });

解决方法:

您可以尝试将OnTouchListener与ACTION_DOWN和ACTION_UP结合使用来处理Press / Release事件,而不是OnClickListener.

修改后的代码：

public void setSingleEvent(GridLayout maingrid) {
    for (int i = 0; i < maingrid.getChildCount(); i++) {
        final CardView cardView = (CardView) maingrid.getChildAt(i);
        final int finalI = i;

        cardView.setOnTouchListener(new OnTouchListener () {
          public boolean onTouch(View view, MotionEvent event) {
            if (event.getAction() == android.view.MotionEvent.ACTION_DOWN) {
              Toast.makeText(mcontext, "Button: " + finalI, Toast.LENGTH_SHORT).show();
              cardView.setCardBackgroundColor(mcontext.getResources().getColor(R.color.buttonPressed));
              if (finalI == 0) {
                  mcontext.startActivity(new Intent(mcontext, Genre_Streaming.class));
              }
            } else if (event.getAction() == android.view.MotionEvent.ACTION_UP) {
              /* Reset Color */
              cardView.setCardBackgroundColor(mcontext.getResources().getColor(R.color.red));
            }
            return true;
          }
        }
}

链接：http://developer.android.com/reference/android/view/MotionEvent.html#ACTION_UP

标签：android-gridlayout,android-cardview,java,android
来源： https://codeday.me/bug/20191109/2012716.html