यह असामान्य लेकिन काफी सामान्य व्यवहार नहीं है। आपको चिंता करने की ज़रूरत नहीं है।
यह सच है कि एक व्यूहोल्डर का पुनर्नवीनीकरण किया जाएगा और फिर से फिर से बनाया नहीं जाएगा।
हालांकि, एकाधिक व्यूहोल्डर ऐप की स्क्रीन पर एकाधिक आइटम प्रदर्शित करने के लिए आवश्यक हैं। तो व्यूहोल्डर्स की एक निश्चित संख्या बनाई जाएगी और इसके लिए क्रिएटव्यूहोल्डर को निश्चित समय कहा जाता है।
और जब भी ViewHolders में डेटा रीसेट हो जाता है तो ऑनबिंडव्यूहोल्डर को infinitly कहा जाएगा।
MainActivity:
public class MainActivity extends AppCompatActivity {
private static final String[] DATASET = new String[]{
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
MyAdapter myAdapter = new MyAdapter(DATASET);
recyclerView.setAdapter(myAdapter);
}
}
MyAdapter:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private static final String LOG_TAG = "RecyclerViewAdapter";
private String[] dataset;
private int counterOnCreateViewHolder = 0;
private int counterOnBindViewHolder = 0;
public MyAdapter(String[] dataset) {
Log.d(LOG_TAG, "Construct");
this.dataset = dataset;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView textView;
public ViewHolder(TextView textView) {
super(textView);
this.textView = textView;
}
}
@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Log.d(LOG_TAG, "onCreateViewHolder (" + ++counterOnCreateViewHolder + ")");
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.adapter_textview, parent, false);
ViewHolder viewHolder = new ViewHolder((TextView) view);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Log.d(LOG_TAG, "onBindViewHolder (" + ++counterOnBindViewHolder + ")");
holder.textView.setText(dataset[position]);
}
@Override
public int getItemCount() {
// Log.d(LOG_TAG, "getItemCount");
return dataset.length;
}
}
लेआउट/activity_main.xml:
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:id="@+id/recycler_view" />
एल
मैं नीचे की तरह परीक्षण आवेदन के साथ इस तथ्य की जांच की ayout/adapter_textview.xml:
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/adapter_textview"
android:textSize="30sp" />
परिणाम:
09-22 06:03:04.166 D/RecyclerViewAdapter﹕ Construct
09-22 06:03:05.179 D/RecyclerViewAdapter﹕ onCreateViewHolder (1)
09-22 06:03:05.183 D/RecyclerViewAdapter﹕ onBindViewHolder (1)
09-22 06:03:05.190 D/RecyclerViewAdapter﹕ onCreateViewHolder (2)
09-22 06:03:05.192 D/RecyclerViewAdapter﹕ onBindViewHolder (2)
09-22 06:03:05.192 D/RecyclerViewAdapter﹕ onCreateViewHolder (3)
09-22 06:03:05.194 D/RecyclerViewAdapter﹕ onBindViewHolder (3)
09-22 06:03:05.195 D/RecyclerViewAdapter﹕ onCreateViewHolder (4)
09-22 06:03:05.197 D/RecyclerViewAdapter﹕ onBindViewHolder (4)
09-22 06:03:05.198 D/RecyclerViewAdapter﹕ onCreateViewHolder (5)
09-22 06:03:05.199 D/RecyclerViewAdapter﹕ onBindViewHolder (5)
09-22 06:03:05.200 D/RecyclerViewAdapter﹕ onCreateViewHolder (6)
09-22 06:03:05.202 D/RecyclerViewAdapter﹕ onBindViewHolder (6)
09-22 06:03:05.203 D/RecyclerViewAdapter﹕ onCreateViewHolder (7)
09-22 06:03:05.204 D/RecyclerViewAdapter﹕ onBindViewHolder (7)
09-22 06:03:05.206 D/RecyclerViewAdapter﹕ onCreateViewHolder (8)
09-22 06:03:05.207 D/RecyclerViewAdapter﹕ onBindViewHolder (8)
09-22 06:03:05.209 D/RecyclerViewAdapter﹕ onCreateViewHolder (9)
09-22 06:03:05.211 D/RecyclerViewAdapter﹕ onBindViewHolder (9)
09-22 06:03:05.212 D/RecyclerViewAdapter﹕ onCreateViewHolder (10)
09-22 06:03:05.213 D/RecyclerViewAdapter﹕ onBindViewHolder (10)
09-22 06:03:05.215 D/RecyclerViewAdapter﹕ onCreateViewHolder (11)
09-22 06:03:05.217 D/RecyclerViewAdapter﹕ onBindViewHolder (11)
09-22 06:03:05.218 D/RecyclerViewAdapter﹕ onCreateViewHolder (12)
09-22 06:03:05.220 D/RecyclerViewAdapter﹕ onBindViewHolder (12)
09-22 06:03:55.048 D/RecyclerViewAdapter﹕ onCreateViewHolder (13)
09-22 06:03:55.050 D/RecyclerViewAdapter﹕ onBindViewHolder (13)
09-22 06:03:55.228 D/RecyclerViewAdapter﹕ onCreateViewHolder (14)
09-22 06:03:55.229 D/RecyclerViewAdapter﹕ onBindViewHolder (14)
09-22 06:03:55.230 D/RecyclerViewAdapter﹕ onCreateViewHolder (15)
09-22 06:03:55.231 D/RecyclerViewAdapter﹕ onBindViewHolder (15)
09-22 06:03:55.232 D/RecyclerViewAdapter﹕ onBindViewHolder (16)
09-22 06:03:55.232 D/RecyclerViewAdapter﹕ onBindViewHolder (17)
09-22 06:03:55.260 D/RecyclerViewAdapter﹕ onBindViewHolder (18)
09-22 06:03:55.276 D/RecyclerViewAdapter﹕ onBindViewHolder (19)
09-22 06:03:55.296 D/RecyclerViewAdapter﹕ onBindViewHolder (20)
09-22 06:03:55.310 D/RecyclerViewAdapter﹕ onBindViewHolder (21)
आप देख सकते हैं, केवल onBindViewHolder onCreateViewHolder (15) के बाद बुलाया गया था।
वहाँ किसी भी तरह से, क्योंकि मैं स्क्रॉल में प्रदर्शन मुद्दा है onBindViewHolder विधि के कई कॉल को संभालने के लिए है।। धन्यवाद –