我是android studio的新手。我在工作上坐了几天，但是我没有按照预期的方式管理我的按钮片段。
我的结构：
对于我的片段，我有一个java类，其中我定义了Button的方法。 （的onClick（））
我有一个main-activity，其中包含/ knows / ...片段/片段的java-class
当我点击我的按钮时，应用程序崩溃了。 我认为必须将片段绑定到主要活动。我以为我已经说过这样做了：
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_sub_page01, container, false);
return rootView;
}
在主要活动中。
但似乎我忘记了重要的事情。如果有人可以帮助我，我将不胜感激。
MainActivity.java
package com.example.yasars.my_fernbedienung;
import android.os.AsyncTask;
import android.support.design.widget.TabLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.HttpAuthHandler;
import android.widget.TextView;
import android.widget.SeekBar;
import android.widget.Toast;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.app.Activity;
import android.util.Log;
import org.json.JSONException;
import org.w3c.dom.Text;
import java.io.IOException;
public class MainActivity extends AppCompatActivity {
private SeekBar mySoundBar;
private TextView textView;
private HttpRequest httpRequest;
private String ipaddress;
private void initializeVariables() {
mySoundBar = (SeekBar) findViewById(R.id.mySoundBar); // initiate the Seekbar
textView = (TextView) findViewById(R.id.volumeView); // initiate volume print
ipaddress = "192.168.56.1";
httpRequest = new HttpRequest(ipaddress, 4, true); //4 stands for 4 milliseconds to wait for a response
}
public void onClick(View v) {
}
private static final String Tag = "myDebugAid";
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
@Override
public void addContentView(View view, ViewGroup.LayoutParams params) {
super.addContentView(view, params);
Log.i(Tag, "addContentView");
}
@Override
protected void onStop() {
super.onStop();
Log.i(Tag, "onStop");
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Log.i(Tag, "onSaveInstanceState");
}
@Override
protected void onPause() {
super.onPause();
Log.i(Tag, "onPause");
}
@Override
protected void onResume() {
super.onResume();
Log.i(Tag, "onResume");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initializeVariables();
mySoundBar.setMax(100); // 100 maximum value for the Seek bar
mySoundBar.setProgress(10);
textView.setText(mySoundBar.getProgress() + "/" + mySoundBar.getMax());
mySoundBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
int progress = 0;
@Override
public void onProgressChanged(SeekBar seekBar, int progressValue, boolean fromUser) {
progress = progressValue;
textView.setText(progress + "/" + seekBar.getMax());
try {
httpRequest.execute("volume=" + progress);
} catch (IOException | JSONException | IllegalArgumentException e) {
}
//Toast.makeText(getApplicationContext(), "Changing volume", Toast.LENGTH_SHORT).show();
//we don't need above line. It is irritating for the user
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
textView.setText(progress + "/" + seekBar.getMax());
try {
httpRequest.execute("volume=" + progress);
} catch (IOException | JSONException | IllegalArgumentException e) {
}
//Toast.makeText(getApplicationContext(), "Started tracking volume", Toast.LENGTH_SHORT).show();
//we don't need above line. It is irritating for the user
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
textView.setText(progress + "/" + seekBar.getMax());
try {
httpRequest.execute("volume=" + progress);
} catch (IOException | JSONException | IllegalArgumentException e) {
}
}
});
//HttpRequest httpReq = new HttpRequest(); // an instance of HttpRequest
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
try {
httpRequest.execute("channelMain=8a");
} catch (IOException | JSONException | IllegalArgumentException e) {
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
return super.onOptionsItemSelected(item);
}
// seekBarInstanceVariable.setOnSeekBarChangeListener(new OnSeekBarChangeListener()) {
//
// } //This method is used to notify the user changes/actions in the SeekBar.
public void onProgressChanged(SeekBar seekBar, int progresValue, boolean fromUser) {
} //This listener method will be invoked if any change is made in the SeekBar.
public void onStartTrackingTouch(SeekBar seekBar) {
} //This listener method will be invoked at the start of user’s touch event. Whenever a user
// touch the thumb for dragging this method will automatically called.
public void onStopTrackingTouch(SeekBar seekBar) {
} //This listener method will be invoked at the end of user touch event. Whenever a user stop
// dragging the thump this method will be automatically called.
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (getArguments().getInt(ARG_SECTION_NUMBER) == 1) {
View rootView = inflater.inflate(R.layout.fragment_sub_page01, container, false);
return rootView;
} else if (getArguments().getInt(ARG_SECTION_NUMBER) == 2) {
View rootView = inflater.inflate(R.layout.fragment_sub_page02, container, false);
return rootView;
} else if (getArguments().getInt(ARG_SECTION_NUMBER) == 3) {
View rootView = inflater.inflate(R.layout.fragment_sub_page03, container, false);
return rootView;
} else {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.section_label);
textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Home";
case 1:
return "Favoriten";
case 2:
return "Sender";
}
return null;
}
}
}
SubPage01.java：
package layout;
import android.content.Context;
import android.content.DialogInterface;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.SeekBar;
import java.io.IOException;
import java.util.Vector;
import java.util.Map;
import com.example.yasars.my_fernbedienung.HttpRequest;
import com.example.yasars.my_fernbedienung.R;
import org.json.JSONException;
/**
* A simple {@link Fragment} subclass.
* Activities that contain this fragment must implement the
* {@link SubPage01.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {@link SubPage01#newInstance} factory method to
* create an instance of this fragment.
*/
public class SubPage01 extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private Button button_tri_right;
private Button button_tri_left;
private HttpRequest httpRequest;
private String ipaddress;
private int onChannel = 1; //it is for the channel recognition.
private Map<String, String> ChannelMap;
private void initializeHttpRequest() {
ipaddress = "192.168.56.1";
httpRequest = new HttpRequest(ipaddress, 4, true);
}
private void fillChannelContainer() {
ChannelMap.put("1", "8a");
ChannelMap.put("2", "8b");
ChannelMap.put("3", "8c");
ChannelMap.put("4", "22a");
ChannelMap.put("5", "22b");
ChannelMap.put("6", "22c");
ChannelMap.put("7", "22d");
ChannelMap.put("8", "34a");
ChannelMap.put("9", "34b");
ChannelMap.put("10", "34c");
ChannelMap.put("11", "34d");
ChannelMap.put("12", "37a");
ChannelMap.put("13", "37b");
ChannelMap.put("14", "37c");
/* ChannelMap.put("Phoenix", "8a");
ChannelMap.put("BR", "8b");
ChannelMap.put("SWR", "8c");
ChannelMap.put("ZDF", "22a");
ChannelMap.put("3Sat", "22b");
ChannelMap.put("ZDFinfo" "22c");
ChannelMap.put("KiKa", "22d");
ChannelMap.put("RTL", "34a");
ChannelMap.put("RTL2", "34b");
ChannelMap.put("Super RTL", "34c");
ChannelMap.put("Vox", "34d");
ChannelMap.put("Das Erste", "37a");
ChannelMap.put("hr", "37b");
ChannelMap.put("arte", "37c");*/
}
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public SubPage01() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment SubPage01.
*/
// TODO: Rename and change types and number of parameters
public static SubPage01 newInstance(String param1, String param2) {
SubPage01 fragment = new SubPage01();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
initializeHttpRequest();
fillChannelContainer();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
//return inflater.inflate(R.layout.fragment_sub_page01, container, false);
View v = inflater.inflate(R.layout.fragment_sub_page01, container, false);
Button b1 = (Button) v.findViewById(R.id.right_triangle_button);
b1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.right_triangle_button: {
if (onChannel == 14) {
onChannel = 1;
} else {
onChannel = onChannel + 1;
}
String tmpString = String.valueOf(onChannel);
try {
httpRequest.execute("channelMain=" + ChannelMap.get(tmpString));
System.out.println(ChannelMap.get(tmpString));
} catch (IOException | JSONException | IllegalArgumentException e) {
}
}
}
}
});
Button b2 = (Button) v.findViewById(R.id.left_triangle_button);
b2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.left_triangle_button: {
if (onChannel == 1)
{
onChannel = 14;
} else
{
onChannel = onChannel - 1;
}
String tmpString = String.valueOf(onChannel);
try
{
httpRequest.execute("channelMain=" + ChannelMap.get(tmpString));
System.out.println(ChannelMap.get(tmpString));
} catch (IOException | JSONException |
IllegalArgumentException e)
{
}
}
}
}
});
return v;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
button_tri_right = (Button) getView().findViewById(R.id.right_triangle_button); //this is necessary because you can't
button_tri_left = (Button) getView().findViewById(R.id.left_triangle_button); //use findViewById() directly, like in
//activities.
}
/*// TODO: Rename method, update argument and hook method into UI event
public void onButtonRightPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
String tmpString = String.valueOf(onChannel);
try {
httpRequest.execute("channelMain=" + ChannelMap.get(tmpString));
} catch (IOException | JSONException | IllegalArgumentException e) {
}
onChannel = onChannel + 1;
}
public void onButtonLeftPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
String tmpString = String.valueOf(onChannel);
try {
httpRequest.execute("channelMain=" + ChannelMap.get(tmpString));
System.out.println(ChannelMap.get(tmpString));
} catch (IOException | JSONException | IllegalArgumentException e) {
}
onChannel = onChannel + 1;
}*/
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
fragment_sub_page01.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="layout.SubPage01">
<Button
android:id="@+id/left_triangle_button"
android:layout_width="60dp"
android:layout_height="80dp"
android:layout_gravity="center"
android:layout_marginStart="-100dp"
android:background="@drawable/triangle_button_left"
android:clickable="true"
app:backgroundTint="#076a24" />
<Button
android:id="@+id/right_triangle_button"
android:layout_width="60dp"
android:layout_height="80dp"
android:layout_gravity="center"
android:layout_marginStart="100dp"
android:background="@drawable/triangle_button_right"
android:clickable="true"
android:onClick="onClick"
app:backgroundTint="#076a24" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Sendung"
android:layout_gravity="center"
android:layout_marginTop="-100dp"
/>
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Sender"
android:layout_gravity="center"
android:layout_marginTop="-150dp" />
<EditText
android:id="@+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:ems="4"
android:hint="Nr."
android:inputType="number"
android:textAlignment="center" />
</FrameLayout>
我尝试了一些可能的解决方案，但无法解决我的问题。
提前致谢。
编辑：谈话是关于按钮：
答案 0 :(得分：0)
可能是因为您尝试在UI线程上执行网络请求（检查崩溃日志）。 网络请求应该在后台线程上完成。