所以我目前正在製作一個需要號碼選擇器的應用程序。我使用-button textview +按鈕佈局創建了數字選擇器。除了刪除號碼並嘗試按下任何按鈕之外,選取器都可以正常工作,此時應用程序會崩潰。Android應用程序自定義號碼選擇器
public class MainActivity extends Activity implements OnClickListener {
Button btnUp, btnDown;
EditText editTextSonyResult;
int nStart = (-100);
int nEnd = 250;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnUp = (Button) findViewById(R.id.plusButton1);
btnDown = (Button) findViewById(R.id.minusButton1);
editTextSonyResult = (EditText) findViewById(R.id.numberView1);
editTextSonyResult.setText("0");
btnUp.setOnClickListener(this);
btnDown.setOnClickListener(this);
}
public void onClick(View v) {
String getString = String.valueOf(editTextSonyResult.getText());
int current = Integer.parseInt(getString);
if (v == btnUp) {
if (current < nEnd) {
current++;
editTextSonyResult.setText(String.valueOf(current));
}
}
if (v == btnDown) {
if (current > nStart) {
current--;
editTextSonyResult.setText(String.valueOf(current));
}
}
}
任何幫助,將不勝感激。 乾杯
這裏是在誤差 04-27 19的點的logcat:58:10.042 3016-3016/com.example.liam.sonyreportingapp d/AndroidRuntime:關閉VM 04-27 19時58分:10.042 3016-3016/com.example.liam.sonyreportingapp E/AndroidRuntime:致命例外:main 進程:com.example.liam.sonyreportingapp,PID:3016 java.lang.NumberFormatException:Invalid int:「」 at java java.lang.Integer.parseInt(Integer.java:138) at com.example(java.lang.Integer.parseInt .liam.sonyreportingapp.MainActivity.onClick(MainActivity .java:42) at android.view.View.performClick(View.java:4780) at android.view.View $ PerformClick.run(View.java:19866) at android.os.Handler.handleCallback(Handler .java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java :5257) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller。運行(ZygoteInit.java:903) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
的電流變爲零..這就是原因 – Prakhar