我一直在处理这个问题,即使在尝试从已经提出的问题中实现其他想法之后,我也无法让它工作。
我正在处理碎片。我正在尝试从我选择的片段中找到一个视图,并在onStart()
中调用的方法中使用它。这是它的外观:
@Override
protected void onStart() {
super.onStart();
Log.e(TAG, "On start");
if (!mBluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
else {
if (mCommandService == null)
setupCommand();
}
}
private void setupCommand() {
Log.d(TAG, "setupChat()");
mConversationArrayAdapter = new ArrayAdapter<String>(this, R.layout.message);
mConversationView = (ListView) findViewById(R.id.in);
mConversationView.setAdapter(mConversationArrayAdapter);
mOutEditText = (EditText) findViewById(R.id.edit_text_out);
mOutEditText.setOnEditorActionListener(mWriteListener);
mSendButton = (Button) findViewById(R.id.action_send);
mSendButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Send a message using content of the edit text widget
TextView view = (TextView) findViewById(R.id.edit_text_out);
String message = view.getText().toString();
sendMessage(message);
}
});
mCommandService = new CommandService(this, mHandler);
mOutStringBuffer = new StringBuffer("");
}
@SuppressLint("ValidFragment")
public class SendSectionFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.send, container, false);
rootView.findViewById(R.id.action_send)
.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
return rootView;
}
}
SendSectionFragment
片段正在使用自己的.xml
。我想做的是引用SendSectionFragment.xml
ListView
。导致麻烦的原因:
01-06 18:05:21.259: E/AndroidRuntime(17868): Caused by: java.lang.NullPointerException
01-06 18:05:21.259: E/AndroidRuntime(17868): at com.receive.bluereceive.Main.setupCommand(Main.java:244)
01-06 18:05:21.259: E/AndroidRuntime(17868): at com.receive.bluereceive.Main.onStart(Main.java:217)
其中 217 表示setupCommand();
,244 表示mConversationView.setAdapter(mConversationArrayAdapter);
我该如何处理?SendSectionFragment
不是我的应用程序的主要部分。
从 setupCommand() 中删除此行 -
mConversationView = (ListView) findViewById(R.id.in);
它在onCreateView()中,像这样-
mConversationView = (ListView) rootView.findViewById(R.id.in);