我使用LayoutInflator
來試圖讓用戶的文本顯示在TableLayout
(這是scrollView
的孩子)但是到目前爲止,它只是一直拋出空指針異常。所有的ID工作正常,我試圖清理項目,看看是否會有所幫助,但無濟於事,任何人都可以幫助我?使用LayoutInflator()時出現空指針異常?
順便說一句,它告訴我的錯誤是在2個地方,reminderListTextView.setText(text);
和inflate("test");
代碼:
public class MainActivity extends ActionBarActivity {
private TableLayout reminderTableScrollView;
// TextView and Button added
EditText reminderEditText;
Button addReminderButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
reminderTableScrollView = (TableLayout) findViewById(R.id.reminderTableScrollView);
reminderEditText = (EditText) findViewById(R.id.reminderEditText);
addReminderButton = (Button) findViewById(R.id.enterButton);
addReminderButton.setOnClickListener(reminderClickListener);
}
private OnClickListener reminderClickListener = new Button.OnClickListener() {
@Override
public void onClick(View v) {
if (reminderEditText.getText().toString() == null || reminderEditText.getText().toString() == "") {
Toast.makeText(getApplicationContext(), "Enter reminder", Toast.LENGTH_SHORT).show();
} else {
inflate("Test");
reminderEditText.setText("");
}
}
};
public void inflate(String text) {
LayoutInflater inflator = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View reminder = inflator.inflate(R.layout.reminder_layout, null);
TextView reminderListTextView = (TextView) findViewById(R.id.reminderListTextView);
reminderListTextView.setText(text);
reminderTableScrollView.addView(reminder);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.menuAdd) {
return true;
}
return super.onOptionsItemSelected(item);
}
}