我正在使用片段,编译器不会引发错误。但是,当我按为创建侦听器的指定按钮时,应用程序会崩溃!logcat将null object reference
引用到代码的这一部分...
private ImageView i;
private String key = null;
private ArrayList<String> lst = new ArrayList();
private OnClickListener lstn = new OnClickListener() {
public void onClick(View v)
{
EditText et1 = (EditText) v.findViewById(R.id.editText1);
profilname = et1.getText().toString();
new getPbLink().execute(new String[]{profilname});
}
};
private OnClickListener lstn1 = new OnClickListener() {
public void onClick(View v)
{
if (pb == null)
{
Toast.makeText(getActivity(),"nodp", 0)
.show();
} else
{
SaveImage(pb);
Toast.makeText(getActivity(), "saved", 0)
.show();
}
}
};
该怎么办?logcat-
Process: com.nav.drawer, PID: 21833
12-22 20:43:14.696 21833 21833 E AndroidRuntime java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
12-22 20:43:14.696 21833 21833 E AndroidRuntime at com.nav.drawer.HomeFragment$100000001.onClick(HomeFragment.java:61)
12-22 20:43:14.696 21833 21833 E AndroidRuntime at android.view.View.performClick(View.java:4785)
12-22 20:43:14.696 21833 21833 E AndroidRuntime at android.view.View$PerformClick.run(View.java:19884)
12-22 20:43:14.696 21833 21833 E AndroidRuntime at android.os.Handler.handleCallback(Handler.java:739)
12-22 20:43:14.696 21833 21833 E AndroidRuntime at android.os.Handler.dispatchMessage(Handler.java:95)
12-22 20:43:14.696 21833 21833 E AndroidRuntime at android.os.Looper.loop(Looper.java:135)
12-22 20:43:14.696 21833 21833 E AndroidRuntime at android.app.ActivityThread.main(ActivityThread.java:5343)
12-22 20:43:14.696 21833 21833 E AndroidRuntime at java.lang.reflect.Method.invoke(Native Method)
12-22 20:43:14.696 21833 21833 E AndroidRuntime at java.lang.reflect.Method.invoke(Method.java:372)
在" onClick"事件上,传递的视图是您单击的视图。因此,如果您要单击一个按钮,则找不到任何可持续的内容,因为它在这里不存在。
您需要在包含它的视图上调用函数" findViewById",而不是通过方法onclick传递的视图。