android - 如何让两个单独的按钮在一个 Activity 中做两件不同的事情？

Question

我正在尝试让一个按钮计算并显示货币(这个正在运行)，我正在尝试让另一个按钮打开另一个 Activity 并在那里显示货币计算。

我尝试了不同的方法来尝试为 btnSubmit(显示货币计算结果)和 btnDifferent(在显示货币计算结果的单独 Activity 中打开结果)提供两个不同的选项。

现在我只能设法计算结果并同时打开另一个 Activity 。

public class MainActivity extends AppCompatActivity {

    public Spinner spnCurrency1, spnCurrency2;
    public Button btnSubmit;
    public Button btnDifferent;
    public EditText from;
    public TextView to;

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

        btnSubmit = (Button) findViewById(R.id.btnSubmit);
        btnDifferent = (Button) findViewById(R.id.btnDifferent);
        from = (EditText) findViewById(R.id.InputEditText);
        to = (TextView) findViewById(R.id.OutputTextView);


        spnCurrency1 = (Spinner) findViewById(R.id.spnCurrency1);
        List<String> lstCurrency1 = new ArrayList<String>();
        lstCurrency1.add("Euro");
        lstCurrency1.add("USD");
        lstCurrency1.add("Pound");
        ArrayAdapter<String> dataAdapter1 = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, lstCurrency1);
        dataAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spnCurrency1.setAdapter(dataAdapter1);


        spnCurrency2 = (Spinner) findViewById(R.id.spnCurrency2);
        List<String> lstCurrency2 = new ArrayList<String>();
        lstCurrency2.add("Euro");
        lstCurrency2.add("USD");
        lstCurrency2.add("Pound");
        ArrayAdapter<String> dataAdapter2 = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, lstCurrency2);
        dataAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spnCurrency2.setAdapter(dataAdapter2);
    }

    public void onClick(View v) {

        int index1 = spnCurrency1.getSelectedItemPosition();
        int index2 = spnCurrency2.getSelectedItemPosition();
        float value = Float.parseFloat(from.getText().toString());



               Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                startActivity(intent);


                float ratio[] = {0.9f, 1.0f, 0.78f};
                float result = value / ratio[index1] * ratio[index2];
                to.setText(result + "");

        }
    }

Answer 1

检查 View 的 ID 并根据它执行操作:

public void onClick(View v) {
    int index1 = spnCurrency1.getSelectedItemPosition();
    int index2 = spnCurrency2.getSelectedItemPosition();
    float value = Float.parseFloat(from.getText().toString());

    float ratio[] = {0.9f, 1.0f, 0.78f};
    float result = value / ratio[index1] * ratio[index2];

    switch (v.getId()) {
        case R.id.btnSubmit:
            to.setText(result + "");
            break;
        case R.id.btnDifferent:
            Intent intent = new Intent(MainActivity.this, SecondActivity.class);
            intent.putExtra("Result", result);
            startActivity(intent);
            break;
    }
}