我有一个有效的代码。我有一个TabLayout菜单和两个项目。此代码有效。但是，当我向右或向左滚动屏幕时，另一个片段会打开。我不想要这个。单击选项卡菜单，然后我希望片段打开。例如，我希望在按下A片段时打开A片段。
MyFragmentAdapter
public class MyFragmentAdapter extends FragmentPagerAdapter {
int tabCount;
public MyFragmentAdapter(FragmentManager fm, int numberOfTabs) {
super(fm);
this.tabCount = numberOfTabs;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
WebFragment tab1 = new AFragment();
return tab1;
case 1:
PromotionFragment tab2 = new BFragment();
return tab2;
default:
return null;
}
}
@Override
public int getCount() {
return tabCount;
}
}
MyActivity
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
TabLayout tabLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/** TabLayout and Fragments */
tabLayout = findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("A"));
tabLayout.addTab(tabLayout.newTab().setText("B"));
viewPager = findViewById(R.id.pager);
final PagerAdapter adapter = new MyFragmentAdapter(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
}
答案 0 :(得分：2)
通过自定义ViewPager到非滑动ViewPager的更简单解决方案。
添加此类
Epoch 1/1
2018-08-15 20:28:54.784459: I tensorflow/compiler/xla/service/service.cc:159] XLA service 0x7f70ec071a30 executing computations on platform Host. Devices:
2018-08-15 20:28:54.784509: I tensorflow/compiler/xla/service/service.cc:167] StreamExecutor device (0): <undefined>, <undefined>
2018-08-15 20:28:55.548381: E tensorflow/core/common_runtime/bfc_allocator.cc:246] tried to allocate 0 bytes
2018-08-15 20:28:55.548481: W tensorflow/core/common_runtime/allocator_retry.cc:32] Request to allocate 0 bytes
2018-08-15 20:28:55.561315: E tensorflow/core/common_runtime/bfc_allocator.cc:246] tried to allocate 0 bytes
2018-08-15 20:28:55.561365: W tensorflow/core/common_runtime/allocator_retry.cc:32] Request to allocate 0 bytes
---------------------------------------------------------------------------
ResourceExhaustedError Traceback (most recent call last)
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/client/session.py in _do_call(self, fn, *args)
1321 try:
-> 1322 return fn(*args)
1323 except errors.OpError as e:
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/client/session.py in _run_fn(feed_dict, fetch_list, target_list, options, run_metadata)
1306 return self._call_tf_sessionrun(
-> 1307 options, feed_dict, fetch_list, target_list, run_metadata)
1308
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/client/session.py in _call_tf_sessionrun(self, options, feed_dict, fetch_list, target_list, run_metadata)
1408 self._session, options, feed_dict, fetch_list, target_list,
-> 1409 run_metadata)
1410 else:
ResourceExhaustedError: Out of memory while trying to allocate 0 bytes.
[[Node: cluster_1/_4/_5 = _XlaLaunch[Nresources=0, Targs=[], Tconstants=[], Tresults=[DT_FLOAT], function=cluster_1[_XlaCompiledKernel=true, _XlaNumConstantArgs=0, _XlaNumResourceArgs=0], _device="/job:localhost/replica:0/task:0/device:CPU:0"]()]]
Hint: If you want to see a list of allocated tensors when OOM happens, add report_tensor_allocations_upon_oom to RunOptions for current allocation info.
During handling of the above exception, another exception occurred:
ResourceExhaustedError Traceback (most recent call last)
<ipython-input-46-dbab7a29ab1f> in <module>()
----> 1 model.fit(train_x[:1000], train_y[:1000], epochs=1)
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/keras/_impl/keras/engine/training.py in fit(self, x, y, batch_size, epochs, verbose, callbacks, validation_split, validation_data, shuffle, class_weight, sample_weight, initial_epoch, steps_per_epoch, validation_steps, **kwargs)
1214 initial_epoch=initial_epoch,
1215 steps_per_epoch=steps_per_epoch,
-> 1216 validation_steps=validation_steps)
1217
1218 def evaluate(self,
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/keras/_impl/keras/engine/training_arrays.py in fit_loop(model, inputs, targets, sample_weights, batch_size, epochs, verbose, callbacks, val_inputs, val_targets, val_sample_weights, shuffle, callback_metrics, initial_epoch, steps_per_epoch, validation_steps)
243 ins_batch[i] = ins_batch[i].toarray()
244
--> 245 outs = f(ins_batch)
246 if not isinstance(outs, list):
247 outs = [outs]
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/keras/_impl/keras/backend.py in __call__(self, inputs)
2797 feed_dict = {}
2798
-> 2799 session = get_session()
2800 data_tensors_to_feed = []
2801 for tensor, value in zip(self.inputs, inputs):
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/keras/_impl/keras/backend.py in get_session()
440 if not _MANUAL_VAR_INIT:
441 with session.graph.as_default():
--> 442 _initialize_variables(session)
443 return session
444
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/keras/_impl/keras/backend.py in _initialize_variables(session)
671 v._keras_initialized = True
672 if uninitialized_vars:
--> 673 session.run(variables_module.variables_initializer(uninitialized_vars))
674
675
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/client/session.py in run(self, fetches, feed_dict, options, run_metadata)
898 try:
899 result = self._run(None, fetches, feed_dict, options_ptr,
--> 900 run_metadata_ptr)
901 if run_metadata:
902 proto_data = tf_session.TF_GetBuffer(run_metadata_ptr)
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/client/session.py in _run(self, handle, fetches, feed_dict, options, run_metadata)
1133 if final_fetches or final_targets or (handle and feed_dict_tensor):
1134 results = self._do_run(handle, final_targets, final_fetches,
-> 1135 feed_dict_tensor, options, run_metadata)
1136 else:
1137 results = []
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/client/session.py in _do_run(self, handle, target_list, fetch_list, feed_dict, options, run_metadata)
1314 if handle is None:
1315 return self._do_call(_run_fn, feeds, fetches, targets, options,
-> 1316 run_metadata)
1317 else:
1318 return self._do_call(_prun_fn, handle, feeds, fetches)
~/Work/2018_Summer_CERN/tf_v_tmva/tf_opt/.venv/lib/python3.6/site-packages/tensorflow/python/client/session.py in _do_call(self, fn, *args)
1333 except KeyError:
1334 pass
-> 1335 raise type(e)(node_def, op, message)
1336
1337 def _extend_graph(self):
ResourceExhaustedError: Out of memory while trying to allocate 0 bytes.
[[Node: cluster_1/_4/_5 = _XlaLaunch[Nresources=0, Targs=[], Tconstants=[], Tresults=[DT_FLOAT], function=cluster_1[_XlaCompiledKernel=true, _XlaNumConstantArgs=0, _XlaNumResourceArgs=0], _device="/job:localhost/replica:0/task:0/device:CPU:0"]()]]
Hint: If you want to see a list of allocated tensors when OOM happens, add report_tensor_allocations_upon_oom to RunOptions for current allocation info.
以XML布局代替使用ViewPager，用NonSwipeableViewPager代替，这样您就可以实现“只需单击以制表符即可进入片段”