java - 将字符串传递给android中的另一个 Activity

Question

我正在开发一个应用程序，我需要将一些 TextView 的内容传递给一个新的 Activity ，但我想在应用程序打开时保存我传递的内容，以便用户可以从其他 Activity 中选择更多项目，并且将他们发送到最终结账 Activity 。

现在我有旋转器将选择保存到 TextView

public class Americano extends AppCompatActivity  {
//  MyDBHandler dbHandler;

String result;
TextView tvSize;
Spinner spinner;
int mPos;
String mSelection;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_americano);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    Spinner spinnerSize = (Spinner) findViewById(R.id.spinner_size);
    AdapterView.OnItemSelectedListener listener = new myOnItemSelectedListener();
    spinnerSize.setOnItemSelectedListener(listener);

    Spinner spinnerSyrups = (Spinner) findViewById(R.id.spinner_syrups);
    AdapterView.OnItemSelectedListener listenerSyrups = new myOnItemSelectedListener2();
    spinnerSyrups.setOnItemSelectedListener(listenerSyrups);

    Spinner spinnerTopping = (Spinner) findViewById(R.id.spinner_toppings);
    AdapterView.OnItemSelectedListener listenerTopping = new myOnItemSelectedListener3();
    spinnerTopping.setOnItemSelectedListener(listenerTopping);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            DBAdapter dbAdapter = new DBAdapter(view.getContext());


        }
    });

}

public class myOnItemSelectedListener implements AdapterView.OnItemSelectedListener {
    @Override
    public void onItemSelected(AdapterView<?> parent, View v, int pos, long id) {
        Americano.this.mPos = pos;
        Americano.this.mSelection = parent.getItemAtPosition(pos).toString();
        TextView resultText = (TextView) findViewById(R.id.tvSize);
        resultText.setText(Americano.this.mSelection);
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }
}

public class myOnItemSelectedListener2 implements AdapterView.OnItemSelectedListener {
    @Override
    public void onItemSelected(AdapterView<?> parent, View v, int pos, long id) {
        Americano.this.mPos = pos;
        Americano.this.mSelection = parent.getItemAtPosition(pos).toString();
        TextView resultText = (TextView) findViewById(R.id.tvSyrup);
        resultText.setText(Americano.this.mSelection);
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }
}

public class myOnItemSelectedListener3 implements AdapterView.OnItemSelectedListener {
    @Override
    public void onItemSelected(AdapterView<?> parent, View v, int pos, long id) {
        Americano.this.mPos = pos;
        Americano.this.mSelection = parent.getItemAtPosition(pos).toString();
        TextView resultText = (TextView) findViewById(R.id.tvTopping);
        resultText.setText(Americano.this.mSelection);
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }
}

我有更多与此类似的菜单项类

我想将textview数据传递到结帐页面。但将该数据保存在该页面中，直到用户关闭应用程序。

谢谢

Answer 1

您可以通过 Intent 发送信息。在你的监听器中，你将进入另一个像这样的 Activity :

Intent intent = new Intent(getActivity(), NewActivity.class);
intent.putExtra("RESULT_TEXT", resultText);
startActivity(intent);

在NewActivity上您可以获得如下信息:

@Override
protected void onCreate(Bundle savedInstanceState) {
    Bundle bundle = getIntent().getExtras();
    String resultText = bundle.getString("RESULT_TEXT", "");
}

希望有帮助。