所以昨天我做了一些编码，我从SQL数据库中获取数据以显示在对话框中，然后从那里我有一个按钮将用户带到一个更新页面，用户可以在该页面上更新数据，所以我使用了{ {1}}以获得更新intent.putExtra的自动填充方法。昨天运行代码时，一切正常，但是今天运行时，出现以下错误：
edit box对话框打开的我的活动：
FATAL EXCEPTION: main
Process: Calculator.curtainclub, PID: 18730
java.lang.RuntimeException: Unable to start activity ComponentInfo{Calculator.curtainclub/com.digitalninja.mohammed.curtainclub.Products.UpdateDelete.Upvalence}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2957)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.digitalninja.mohammed.curtainclub.Products.UpdateDelete.Upvalence.onCreate(Upvalence.java:71)
at android.app.Activity.performCreate(Activity.java:7174)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
以及我称为 list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
/** To change selected state view */
view.setSelected(true);
HashMap<String, Object> obj = (HashMap<String, Object>) ADAhere.getItem(position);
String SlectedName = (String) obj.get("NAME");
String SlectedPrice = (String) obj.get("PRICE");
String SlectedSize = (String) obj.get("SIZE");
String SlectedRange = (String) obj.get("RANGE");
String SlectedSupp = (String) obj.get("SUPPLIER");
final String SelectID = (String) obj.get("ID");
final String SlectedName1 = (String) obj.get("NAME");
final String SlectedPrice1 = (String) obj.get("PRICE");
final String SlectedSize1 = (String) obj.get("SIZE");
final String SlectedRange1 = (String) obj.get("RANGE");
final String SlectedSupp1 = (String) obj.get("SUPPLIER");
// Toast.makeText(getActivity().getApplicationContext(), SlectedName, Toast.LENGTH_SHORT).show();
final Dialog dialog = new Dialog(getActivity());
dialog.getWindow();
//dialog.setTitle("Confirm your Vote");
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.diaglog);
final TextView VName = (TextView) dialog.findViewById(R.id.Name);
final TextView VRange = (TextView) dialog.findViewById(R.id.Range);
final TextView VSUPPLIER = (TextView) dialog.findViewById(R.id.Supplier);
final TextView VSIZE = (TextView) dialog.findViewById(R.id.Size);
final TextView VPrice = (TextView) dialog.findViewById(R.id.Price);
VName.setText(SlectedName);
VRange.setText(SlectedRange);
VSUPPLIER.setText(SlectedSupp);
VSIZE.setText(SlectedSize);
VPrice.setText(SlectedPrice);
dialog.show();
Button cancelBtn = (Button) dialog.findViewById(R.id.cancel_btn);
cancelBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
dialog.dismiss();
}
});
Button UpdateBtn = (Button) dialog.findViewById(R.id.updateval);
UpdateBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getActivity().getApplicationContext(),Upvalence.class);
Bundle extras = new Bundle();
extras.putString("ID", SelectID);
extras.putString("name",SlectedName1);
extras.putString("Range",SlectedRange1);
extras.putString("Supplier",SlectedSupp1);
extras.putString("Size",SlectedSize1);
extras.putString("Price",SlectedPrice1);
i.putExtras(extras);
startActivity(i);
}
});
Button deleteBtn = (Button) dialog.findViewById(R.id.btn_delete);
deleteBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getActivity().getApplicationContext(),del.class);
startActivity(i);
}
});
dialog.show();
}
});
的更新活动：
intent