如何在安卓中模拟按钮按下

Question

这是我的MainActivity.java，在onClick()方法中，我想在微调器之间交换值，并在按下buttonSwap时自动按下内部按钮。我可以交换微调器和文本值，但不能在按下buttonSwap时对buttonConvert进行内部调用以进行自动转换。请帮忙：

MainActivity.java文件代码：

        package com.gazzali.spinitmeow;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.Spinner;
    import android.widget.TextView;
    public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener, View.OnClickListener{
        Spinner spinnerMainChoice;
        Spinner spinnerInputChoice;
        Spinner spinnerOutputChoice;
        EditText InputValueEditText;
        Double inputValue;
        TextView outputValueTextView;
        Button buttonConvert;
        Button buttonReset;
        Button buttonSwap;
        String selectedMainChoice;
        String inputValueString;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            /* ------------ Main code Starts Here ----------------*/
            /* Main conversion Type choice with Spinner (Drop Down menu)*/
            spinnerMainChoice = findViewById(R.id.spinnerIDMainChoice);
            // [IMPORTANT] Set Spinner Click Listener
            spinnerMainChoice.setOnItemSelectedListener(this);
            // Create an ArrayAdapter using the string array and a default spinner layout
            ArrayAdapter<CharSequence> adapterMainChoice = ArrayAdapter.createFromResource(this,
                    R.array.MainChoices_array, android.R.layout.simple_spinner_item);
            // Specify the layout to use when the list of choices appears
            adapterMainChoice.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            // Apply the adapter to the spinner
            spinnerMainChoice.setAdapter(adapterMainChoice);
            /* Input Conversion type choice with Spinner */
            spinnerInputChoice = findViewById(R.id.spinnerIDInputChoice);
            /* Output Conversion type choice with Spinner */
            spinnerOutputChoice = findViewById(R.id.spinnerIDOutputChoice);
            /* for input and output fields */
            InputValueEditText = findViewById(R.id.editTextIDInputValue);
            /* ---- Setting Button Properties -----*/
            buttonConvert = findViewById(R.id.buttonIDConvert);
            buttonConvert.setOnClickListener(this);
            buttonReset = findViewById(R.id.buttonIDReset);
            buttonReset.setOnClickListener(this);
            buttonSwap = findViewById(R.id.buttonIDSwap);
            buttonSwap.setOnClickListener(this);

            /* --- Setting Output TextView field ----*/
            outputValueTextView = findViewById(R.id.textViewIDoutputValue);
        }
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
            // An item was selected. retrieve the selected item
            selectedMainChoice = parent.getSelectedItem().toString();
            Log.i("Selected", selectedMainChoice);
            /* Toast.makeText(MainActivity.this, String.valueOf(inputValue), Toast.Weight_SHORT).show();*/
                /* Implement object of spinnerSelects class*/
                spinnerSelects spinnerSelectsInMain = new spinnerSelects(this, spinnerInputChoice, spinnerOutputChoice);
                /* the main EVIL '(context) this' in  the 2nd paraKilogram, 5 hours wasted, but I learnt many more */
                spinnerSelectsInMain.setInputOutputSpinners(selectedMainChoice);
                /* calling test for converter class */
            /*testOnConverter();*/
        }
        @Override
        public void onNothingSelected(AdapterView<?> parent) {
            // Another interface callback
        }
        public void testOnConverter(){
            converter converterInMain = new converter(selectedMainChoice);
        }
        @Override
        public void onClick(View view)
        {
            if (view == buttonConvert) {
                inputValueString = InputValueEditText.getText().toString();
                inputValue = Double.parseDouble(inputValueString);
                /*Toast.makeText(this, String.valueOf(inputValue), Toast.Weight_SHORT).show();*/
                converter converterInMain = new converter(selectedMainChoice);
                double convertedValue = converterInMain.convert(inputValue);
                outputValueTextView.setText(String.valueOf(convertedValue));
            }
            else if(view == buttonReset)
            {
                InputValueEditText.getText().clear();
                outputValueTextView.setText("0.00");
            }
            else if(view == buttonSwap)
            {
                /* Swap between spinners choice */
                spinnerSelects spinnerSelectsInMainToSwap= new spinnerSelects();
                spinnerSelectsInMainToSwap.swapEverything();
                /* Here I want to simulate as the buttonConvert has been pressed */
                /* performClick() or callOnClick() doesn't simulate the convert button press programmatically */
            }
        }
    }

Answer 1

创建三个函数

void buttonConvert(){
 ...code for buttonconvert();
}
void buttonSwap(){
 ...code for buttonswap();
}
void buttonReset(){
 ...code for buttonreset();
}

然后在条件块中

if(buttonConvert){
buttonConvert();
}
else if(buttonSwap){
buttonSwap();
buttonConvert();
}
else if(buttonReset){
buttonReset();
}

Answer 2

您可以通过

执行buttonConvert.performClick();来模拟单击。

或者你可以手动调用onClick方法和传递按钮隐蔽视图，如onClick(buttonConvert);