Question

我已尝试在手机和AVD中执行此代码但不幸的是，应用程序tp2已停止，但是gradle构建完成且没有错误。有人可以帮帮我吗？

package com.example.aboukora.tp2;

public class MainActivity extends Activity {
Spinner spinner;
EditText field;
Button addBtn,UpdateBtn,clearBtn;
ArrayAdapter<String> adapter;
ArrayList<String> films = new ArrayList<String>();

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

    spinner= (Spinner) findViewById(R.id.spinner1);
    field = findViewById(R.id.field);
    addBtn= (Button) findViewById(R.id.addbtn);
    UpdateBtn= (Button) findViewById(R.id.updatebtn);
    clearBtn= (Button) findViewById(R.id.clearbtn);

//ADAPTER
    adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_single_choice,films);
    spinner.setAdapter(adapter);
    spinner.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            field.setText(films.get(i));
        }

    });
    addBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            add();
        }
    });clearBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            delete();
        }
    });
    UpdateBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            update();
        }
    });

}
//methods
private void add(){
    String film=field.getText().toString();
    if(!film.isEmpty() && film.length() >0){
        adapter.add(film);
        adapter.notifyDataSetChanged();
        field.setText("");
        Toast.makeText(getApplicationContext()," Ajoute" + film, Toast.LENGTH_SHORT).show();
    }
    else {
        Toast.makeText(getApplicationContext(), "Rien a ajouter", Toast.LENGTH_SHORT).show();
    }
}
private void update() {
    String film = field.getText().toString();
    int pos = spinner.getSelectedItemPosition();
    if (!film.isEmpty() && film.length() > 0) {
        adapter.remove(films.get(pos));
        adapter.insert(film,pos);
        adapter.notifyDataSetChanged();
        Toast.makeText(getApplicationContext()," Modifie" + film, Toast.LENGTH_SHORT).show();
                                            }
    else {
        Toast.makeText(getApplicationContext()," Pas Modifie" + film, Toast.LENGTH_SHORT).show();

    }
}
private void delete(){
    int pos = spinner.getSelectedItemPosition();
    if(pos > -1){
        adapter.remove(films.get(pos));
        adapter.notifyDataSetChanged();
        Toast.makeText(getApplicationContext()," Supprime" , Toast.LENGTH_SHORT).show();
        field.setText("");
                    }
    else{
        Toast.makeText(getApplicationContext()," Rien a supprimer" , Toast.LENGTH_SHORT).show();

    }
}


}

它似乎工作但实际上它崩溃了。活动崩溃，我无法找到原因，因为没有其他（id）显示。抱歉英文不好

Answer 1

尝试将字段转换为EditText

constructor(public dialog: MatDialog, private webApi: WebapiService) {
}

如果仍有问题，请分享错误消息

Answer 2

setOnItemClickListener不能与Spinner一起使用。请改用此setOnItemSelectedListener。

我的应用程序崩溃了，我不知道为什么

2 个答案: