RecyclerView 滚动滞后于简单项目

Question

我有一个简单的回收器视图，其中包含只有 1 个 imageView 的卡片视图，它是从资源加载的，但是无论如何滚动时我都有很强的滞后性，我尝试了 recycler.setHasFixedSize(true) 但它没有帮助。

活动代码

public class MainActivity extends AppCompatActivity {

    private final int[] drawables = {
            R.drawable.nxt_bluetooth_dongle,
            R.drawable.color_sensor,
            R.drawable.connector_cabels,
            R.drawable.e_motor,
            R.drawable.energy_storage,
            R.drawable.energy_display,
            R.drawable.gyroscopic_sensor,
            R.drawable.intelligent_nxt_brick,
            R.drawable.keyfob_transponder,
            R.drawable.light_sensor,
            R.drawable.motion_sensor,
            R.drawable.nxt_ir_receiver,
            R.drawable.nxt_light_sensor,
            R.drawable.nxt_servo_motor,
            R.drawable.nxt_sound_sensor,
            R.drawable.nxt_touch_sensor,
            R.drawable.nxt_ultrasonic_sensor,
            R.drawable.rf_id_sensor,
            R.drawable.solar_panel,
            R.drawable.tilt_sensor,
            R.drawable.temperature_sensor,
            R.drawable.usb_hub
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RecyclerView recycler = (RecyclerView) findViewById(R.id.recycler);
        MyAdapter adapter = new MyAdapter(drawables);
        recycler.setAdapter(adapter);
        recycler.setLayoutManager(new GridLayoutManager(this, 3));
    }

    private class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyHolder> {

        private int[] drawables;

        private MyAdapter(int[] drawables) {
            this.drawables = drawables;
        }

        @Override
        public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.lego_recycler_item, null, false);
            return new MyHolder(view);
        }

        @Override
        public void onBindViewHolder(MyHolder holder, int position) {
            holder.legoImage.setImageResource(drawables[position]);
        }

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

        class MyHolder extends RecyclerView.ViewHolder {

            ImageView legoImage;

            MyHolder(View itemView) {
                super(itemView);
                legoImage = (ImageView) itemView.findViewById(R.id.legoImage);
                legoImage.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        Intent intent = new Intent(MainActivity.this, LegoDetailActivity.class);
                        intent.putExtra(LegoDetailActivity.EXTRA_DRAWABLE_ID, drawables[getAdapterPosition()]);
                        ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(
                                MainActivity.this, legoImage, "legoDetail"
                        );
                        startActivity(intent, options.toBundle());
                    }
                });
            }
        }
    }
}

活动 xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/recycler"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#e0e0e0"
    tools:context="com.lol.legomindstorms.MainActivity">

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

回收站项目 xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:cardUseCompatPadding="true"
    app:cardCornerRadius="0dp">

    <ImageView
        android:id="@+id/legoImage"
        android:layout_width="115dp"
        android:layout_height="115dp"
        android:transitionName="legoDetail" />

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

Answer 1

根据我的经验，我认为问题在于加载多个图像
由于 android 在内存中加载大量图像时确实存在问题， 因为android默认不允许很多gc memeory size， 查看您的日志，您是否收到 gc 内存过载错误 或类似的东西

1.你也可以尝试改变堆大小

2.尝试使用外部库，总有人说永远不要重新发明轮子 试试滑翔或毕加索

3.尝试自己清除位图内存

PS：我不是那么写，所以请不要介意我的措辞是否不好，但我已经处理了很多这些问题，所以我非常熟悉这个问题