java - 模拟器崩溃 "Invalid int"

Question

我陷入了代码困境，无法继续执行。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:

FATAL EXCEPTION: main java.lang.NumberFormatException: Invalid int: "t" at java.lang.Integer.invalidInt(Integer.java:138)

Answer 1

您正在解析无效的整数。字符串应该只包含数字才能将其解析为 int。

当前您正在将“t”解析为整数，因此您会收到错误。项目应类似于“0”、“1”或任何数字字符串。