我正在做一些计算,但无法将字符串解析为int甚至是float.我寻找解决方案,并且在某个必须有空字符串的地方读取了它,但是我使用
log.v("Valuee",e1.getText().toString());
并且其打印的值证明该字符串不为空.
我想念什么?
这是logcat
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.farrukh.bmi/com.example.farrukh.bmi.Main2Activity}: java.lang.NumberFormatException: Invalid int: “”
at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2195)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NumberFormatException: Invalid int: “”
at java.lang.Integer.invalidInt(Integer.java:137)
at java.lang.Integer.parseInt(Integer.java:358)
at java.lang.Integer.parseInt(Integer.java:331)
at com.example.farrukh.bmi.Main2Activity.onCreate(Main2Activity.java:31)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2159)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
这是MainActivity.java
public class Main2Activity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
final Button b = (Button) findViewById(R.id.button);
final EditText e1 = (EditText) findViewById(R.id.editText2);
final TextView text = (TextView) findViewById(R.id.textView4);
final String height = e1.getText().toString();
final int a = Integer.parseInt(height); //got error while parsing
b.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Log.v("EditText",e1.getText().toString());
}
});
}
}
这是activity.xml
<Button
android:layout_width="132dp"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:layout_gravity="center_horizontal"
android:text="CLICK"
android:clickable="true"
android:id="@+id/button"/>
<EditText
android:layout_width="120dp"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="@+id/editText2"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp"
android:gravity="center" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/textView4"
android:layout_gravity="center_horizontal"
android:gravity="center"
android:layout_marginTop="20dp"
android:textColor="#3b9ff0" />
解决方法:
将这些行放在onClick()中
final String height = e1.getText().toString();
final int a = Integer.parseInt(height);
您正在onCreate()中获取e1的值,而在用户单击按钮时需要它
还需要检查高度是否具有任何值,为此检查Stuluske’s答案
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。