模拟器崩溃"无效int"

Question

我被代码卡住了，无法继续。模拟器崩溃，堆栈指向第47行。请帮助初学者！

public class MainActivity3 extends AppCompatActivity implements View.OnClickListener {



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        Button obutton = (Button) findViewById(R.id.obutton);
        obutton.setOnClickListener(this);

        final Button btn = (Button) findViewById(R.id.button);
        final EditText edt = (EditText) findViewById(R.id.editText);
        final ListView listview = (ListView) findViewById(R.id.Lista);
        final ArrayList<String> list = new ArrayList<>();



            final StableArrayAdapter adapter = new StableArrayAdapter(this, android.R.layout.simple_list_item_1, list);
            listview.setAdapter(adapter);
            btn.setOnClickListener(new View.OnClickListener() {


                @Override
                public void onClick(View v) {
                if (edt.getText().toString() != null) {
                    adapter.addItem(edt.getText().toString());
                }
                }
            });
    }

    private class StableArrayAdapter extends ArrayAdapter<String> {

        ArrayList<String> data = new ArrayList<>();
        private List mIdMap;


        public StableArrayAdapter(Context context, int textViewResourceId,
                                  List<String> objects) {
            super(context, textViewResourceId, objects);
            this.data = (ArrayList) objects;
        }

        @Override
        public long getItemId(int position) {
            String item = getItem(position);
            return (long) mIdMap.get(Integer.parseInt(item)) <-- Crashing 
        }

        public void addItem(String item) {
            data.add(item);
            notifyDataSetChanged();
        }
    }



    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.obutton:
                Intent obama = new Intent(MainActivity3.this, MainActivity.class);
                startActivity(obama);
            case R.id.button:
                Intent test = new Intent(MainActivity3.this, Main6Activity.class);
                startActivityForResult(test, 1);

        }

    }


}

堆栈错误：

致命的例外：主java。lang.NumberFormatException:无效的int:“t”在java中。整型。invalidInt（Integer.java:138）

Answer 1

改变：

    @Override
    public long getItemId(int position) {
        String item = getItem(position);
        return (long) mIdMap.get(Integer.parseInt(item)) <-- Crashing 

to：@覆盖公共长getItemId（int位置）{返回-1l；使其工作。

Answer 2

您正在分析无效的整数。字符串应该只包含数字，以便将其解析为int。

目前，您正在将“t”解析为整数，因此会出现错误。项目应类似于“0”、“1”或任何数字字符串。