阅读背景:

将ArrayAdapter设置为ListView不起作用

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My MainActivity:

import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.ListView;

 import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    ArrayList<Liste> items;
ListView listView;
ArrayAdapter arrayAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    BottomNavigationView bottomNavigationView=(BottomNavigationView) findViewById(R.id.navigation);
    bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            Fragment selectedFragment=null;
            switch (item.getItemId()){
                case R.id.item1:
                    selectedFragment=ItemOneFragment.newInstance();
                    fragment1();
                    break;
                case R.id.item2:
                    selectedFragment=ItemTwoFragment.newInstance();
                    fragment2();
                    break;
                case R.id.item3:
                    selectedFragment=ItemThreeFragment.newInstance();
                    fragment3();
                    break;
            }
            FragmentTransaction transaction=getSupportFragmentManager().beginTransaction();
            transaction.replace(R.id.frame_layout,selectedFragment);
            transaction.commit();
            return true;
        }
    });
    FragmentTransaction transaction=getSupportFragmentManager().beginTransaction();
    transaction.replace(R.id.frame_layout,ItemOneFragment.newInstance());
    transaction.commit();
}
public void fragment1(){

}
public void fragment2(){

}
public void fragment3(){
    items=new ArrayList<>();

    items.add(new Liste("Hiiii",android.R.drawable.ic_dialog_info));
   // items.add(new Liste("Hiiii",R.drawable.));

    listView=(ListView) findViewById(R.id.listv);
    arrayAdapter=new Adapter(this,items);

   listView.setAdapter(arrayAdapter);
}
}
import android.support.annot



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