Question

当你单击ListView项目时，它会通过播放一些动画来响应，例如传播波，使项目背景灰色一段时间。从而用户可以看到点击了哪个项目。在我的RecyclerView上，我已经实现了，目前没有这样的动画。我实现了OnclickListener，当点击项目时，app会执行所有任务，但它缺少这个简单的动画。有人可以帮我这个吗？

MainActivity：

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;
    RecyclerViewAdapter adapter;
    RecyclerView.LayoutManager layoutManager;

    String[] data = {"Cola", "Sprite", "Pizza", "Coffee", "Salt", "Pepper", "KitKat"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        recyclerView = (RecyclerView) findViewById(R.id.myRecyclerView);
        adapter = new RecyclerViewAdapter(data, this);
        layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(adapter);
        RecyclerView.ItemAnimator itemAnimator = new DefaultItemAnimator();
        recyclerView.setItemAnimator(itemAnimator);
    }
}

适配器类：

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder> {

private String[] data;
public Context context;

public RecyclerViewAdapter(String[] input, Context c) {
    data = input;
    context = c;
}

public static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    public MyOnItemClickListener listener;
    public TextView mTextView;
    public Context cont;

    public MyViewHolder(View v, MyOnItemClickListener l, Context c) {
        super(v);
        mTextView = (TextView) v.findViewById(R.id.info_text);
        listener = l;
        cont = c;
        v.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        listener.startActivity(cont);
    }

    public static interface MyOnItemClickListener {
        public void startActivity(Context c);
    }
}

@Override
public RecyclerViewAdapter.MyViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
    final View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_view_item, parent, false);
    MyViewHolder vh = new MyViewHolder(v, new MyViewHolder.MyOnItemClickListener() {
        @Override
        public void startActivity(Context c) {
            Toast.makeText(c, "Item Pressed!", Toast.LENGTH_SHORT).show();

            Intent intent = new Intent(c, ItemInformationActivity.class);
            intent.putExtra("Text", ((TextView) v.findViewById(R.id.info_text)).getText().toString());
            c.startActivity(intent);

        }
    }, context);
    return vh;
}

@Override
public void onBindViewHolder(RecyclerViewAdapter.MyViewHolder holder, int position) {
    holder.mTextView.setText(data[position]);
}

@Override
public int getItemCount() {
    return data.length;
}
}

list_view_item.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="10dp"
card_view:cardCornerRadius="5dp"
card_view:cardElevation="3dp">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="20dp"
    android:layout_marginLeft="20dp"
    android:layout_marginTop="20dp">

    <ImageView
        android:id="@+id/img_android"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginRight="20dp"
        android:src="@mipmap/ic_launcher" />

    <TextView
        android:id="@+id/info_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginTop="10dp"
        android:layout_toRightOf="@+id/img_android"
        android:textSize="18sp"
        android:textStyle="bold" />
</RelativeLayout>

</android.support.v7.widget.CardView>

Answer 1

您指的是RippleDrawable RippleDrawable | Android Developers

您可以将其作为列表项的背景;只需确保/res/layout-v21变体中的RippleDrawable仅适用于Lollipop及其后续版本。

Answer 2

我终于想出了如何进行触摸反馈。克里斯拉尔森说得对，我需要涟漪效应。但是我添加了这个：

android:focusable="true"
android:clickable="true"
android:foreground="?android:attr/selectableItemBackground"

我不需要定制涟漪。只有默认值。这现在工作正常！

单击RecyclerView项时，如ListView中的Ripple响应

2 个答案: