Android应用在启动时关闭

Question

我遇到了一个问题：当我尝试在设备中调试应用程序时，它会在启动后立即关闭。

这是代码：

public class Main extends AppCompatActivity {
    EditText convFromET, convToET, commaNumbET;
    Spinner  selectCatS, convFromS, convToS;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        convFromET = (EditText)findViewById(R.id.input_convert_from);
        convToET = (EditText)findViewById(R.id.input_convert_to);
        commaNumbET = (EditText)findViewById(R.id.input_comma_numbers);

        selectCatS = (Spinner)findViewById(R.id.spinner_select_category);
        convFromS = (Spinner)findViewById(R.id.spinner_convert_from);
        convToS = (Spinner)findViewById(R.id.spinner_convert_to);

        SetSelectCatSOnClickListener( );


    }

    private void SetSelectCatSOnClickListener( ){
        selectCatS.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                ArrayAdapter<CharSequence> adapter;

                switch( position ) {
                    case 0: // length
                        adapter = ArrayAdapter.createFromResource(getApplicationContext(), R.array.spinner_length, android.R.layout.simple_spinner_item);
                        break;

                    case 1: // speed
                        adapter = ArrayAdapter.createFromResource(getApplicationContext(), R.array.spinner_speed, android.R.layout.simple_spinner_item );
                        break;

                    case 2: //tempreture
                        adapter = ArrayAdapter.createFromResource(getApplicationContext(), R.array.spinner_tempreture, android.R.layout.simple_spinner_item );
                        break;

                    case 3: // volume
                        adapter = ArrayAdapter.createFromResource( getApplicationContext(), R.array.spinner_volume, android.R.layout.simple_spinner_item );
                        break;

                    default: // Weigth
                        adapter = ArrayAdapter.createFromResource( getApplicationContext(), R.array.spinner_weigth, android.R.layout.simple_spinner_item );
                        break;
                }

                adapter.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item );
                convFromS.setAdapter( adapter );
                convToS.setAdapter( adapter );
            }
        });
    }
}

这是XML文件（strings.xml）：

<string name="select_category">Choose a category</string>
<string name="convert_from">Convert from</string>
<string name="convert_to">Convert to</string>
<string name="numbers_after_comma">Numbers after comma</string>

<string-array name="spinner_categories">
    <item>Length</item>
    <item>Weigth</item>
    <item>Volume</item>
    <item>Tempreture</item>
    <item>Speed</item>
    <item>Volume</item>
</string-array>

<string-array name="spinner_length">
    <item>Inches</item>
    <item>Feets</item>
    <item>Centimeters</item>
    <item>Meters</item>
    <item>Kilometers</item>
</string-array>

<string-array name="spinner_speed">
    <item>Meters per second</item>
    <item>Kilometers per hour</item>
    <item>Miles per hour</item>
</string-array>

<string-array name="spinner_tempreture">
    <item>Celsius</item>
    <item>Farenheith</item>
    <item>Kelvin</item>
</string-array>

<string-array name="spinner_volume">
    <item>Cubic milimeters</item>
    <item>Cubic centimeters</item>
    <item>Cubic meters</item>
    <item>Liters</item>
</string-array>

<string-array name="spinner_weigth">
    <item>Miligrams</item>
    <item>Grams</item>
    <item>Kilograms</item>
    <item>Pounds</item>
    <item>Tons</item>
</string-array>

顺便说一句，当我在onCreate注释SetSelectCatSOnClickListener()时，该应用程序不会崩溃，因此我认为该问题一定存在。

提前致谢！

Answer 1

它不是OnItemClick，应该是微调器的onItemSelected

Answer 2

要查找有关logcat的错误的详细信息 。

在日食：

转到窗口->显示视图->安卓-> logcat。

然后将Logcat固定到屏幕底部。

您将看到一个默认情况下具有详细说明的下拉列表。 将其更改为错误。 现在，您将仅在Logcat中看到错误。

将您的错误发布到这里后，我相信我们会为您提供帮助。