回收者视图和卡视图中的问题

Question

我想显示卡片视图，但不显示它显示致命异常，任何人都可以用您的编程技能解决此错误。请查看所有布局和类？

public class MainActivity extends AppCompatActivity {
 List<Person> persons;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    RecyclerView  rv = (RecyclerView)findViewById(R.id.recycle);
    rv.setHasFixedSize(true);
    initializeData();
    LinearLayoutManager ll = new LinearLayoutManager(this);
    rv.setLayoutManager(ll);
    RvAdapter rvAdapter = new RvAdapter(persons);
    rv.setAdapter(rvAdapter);

}

private void initializeData() {

    persons = new ArrayList<>();
    persons.add(new Person("Anilkumar","23 years",R.drawable.anil));
    persons.add(new Person("Prashanthi","21 years",R.drawable.inr));
}

}

人类

public class Person
{
String name;
String age;
int photoId;

Person(String name,String age,int photoId)
{
    this.name = name;
    this.age = age;
    this.photoId = photoId;
}

}

RV适配器类

public class RvAdapter extends RecyclerView.Adapter<RvAdapter.PersonViewHolder>
{


private List<Person> persons;
RvAdapter(List<Person> persons)
{
    this.persons = persons;
}

@Override
public PersonViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardlayout,parent,false);
    PersonViewHolder pvh = new PersonViewHolder(v);
    return pvh;
}

@Override
public void onBindViewHolder(PersonViewHolder holder, int position) {
        holder.personName.setText(persons.get(position).name);
    holder.personName.setText(persons.get(position).age);
    holder.personPhoto.setImageResource(persons.get(position).photoId);
}

@Override
public int getItemCount() {

    return persons.size();
}

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
}

public static class PersonViewHolder extends RecyclerView.ViewHolder
{
    CardView cardView;
    TextView personName;
    TextView personAge;
    ImageView personPhoto;
    public PersonViewHolder(View itemView) {
        super(itemView);
        cardView = (CardView)itemView.findViewById(R.id.card);
        personName = (TextView)itemView.findViewById(R.id.text);
        personAge = (TextView)itemView.findViewById(R.id.text2);
        personPhoto = (ImageView)itemView.findViewById(R.id.image);
    }
}
}

Logcat错误

06-20 22:51:57.126 5433-5433/com.example.anilkumar.recyclerview E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.OutOfMemoryError
at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:483)
at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:351)
at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:773)
at android.content.res.Resources.loadDrawable(Resources.java:1940)
at android.content.res.Resources.getDrawable(Resources.java:664)
at android.support.v4.content.ContextCompat.getDrawable(ContextCompat.java:368)
at android.support.v7.internal.widget.TintManager.getDrawable(TintManager.java:177)
at android.support.v7.internal.widget.TintManager.getDrawable(TintManager.java:170)
at android.support.v7.widget.AppCompatImageHelper.setImageResource(AppCompatImageHelper.java:53)
at android.support.v7.widget.AppCompatImageView.setImageResource(AppCompatImageView.java:74)
at com.example.anilkumar.recyclerview.RvAdapter.onBindViewHolder(RvAdapter.java:49)
at com.example.anilkumar.recyclerview.RvAdapter.onBindViewHolder(RvAdapter.java:16)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5746)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5779)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5016)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4892)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2029)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1414)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1377)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:578)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3239)
at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:2767)
at android.view.View.measure(View.java:12723)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:594)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:376)
at android.view.View.measure(View.java:12723)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
at android.support.v7.internal.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
at android.view.View.measure(View.java:12723)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)

卡布局 回收布局

Answer 1

您提到了大图像，处理大尺寸图像时必须注意内存问题。 您可以使用Picasso或Universal Image Loader或Glide

Theese库将异步加载您的图像，并且您不会遇到任何内存问题。

直到今天，我最大的图像尺寸之一是(4560x5250) ，但我没有遇到任何内存问题，但是如果要平滑滚动，可以在Picasso减小图像尺寸。

目前即时通讯使用Picasso在我RecyclerView 。我可以给例如Picasso这样的：

在您的onBindViewHolder ：

@Override
public void onBindViewHolder(PersonViewHolder holder, int position) {
holder.personName.setText(persons.get(position).name);
holder.personAge.setText(persons.get(position).age);
Picasso.with(context).load(persons.get(position).photoId).into(holder.personPhoto);

}

您还可以找到有关Theese库的比较： picasso-vs-imageloader-vs-fresco-vs-glide