这是MainActivity的代码：
package com.example.amit.java5776_7546_8412;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.SearchView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
import entities.Book;
import model.backend.Backend;
import model.backend.BackendFactory;
public class MainActivity extends AppCompatActivity/* implements View.OnClickListener*/ {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private CharSequence mTitle;
private CharSequence mDrawerTitle;
private ActionBarDrawerToggle mDrawerToggle;
private Toolbar topToolBar;
private MenuItem mSearchAction;
private boolean isSearchOpened = false;
// Search list:
private ListView searchResultList;
private ArrayAdapter<Book> adapter;
private ArrayList<Book> bookList;
private SearchView searchView;
private Backend backend;
private ActionBar actionBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
backend = BackendFactory.getInstance(getApplicationContext());
mTitle = mDrawerTitle = getTitle();
topToolBar = (Toolbar)findViewById(R.id.toolbar);
setSupportActionBar(topToolBar);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
String[] titles = getResources().getStringArray(R.array.drawer_titles);
List<ItemObject> drawerItems = new ArrayList<>();
drawerItems.add(new ItemObject(titles[0], R.mipmap.login));
drawerItems.add(new ItemObject(titles[1], R.mipmap.clock));
drawerItems.add(new ItemObject(titles[2], R.mipmap.coins));
drawerItems.add(new ItemObject(titles[3], R.mipmap.message));
drawerItems.add(new ItemObject(titles[4], R.mipmap.settings));
mDrawerList.setAdapter(new CustomAdapter(this, drawerItems));
mDrawerToggle = new ActionBarDrawerToggle(MainActivity.this, mDrawerLayout, R.string.drawer_open, R.string.drawer_close) {
/** Called when a drawer has settled in a completely closed state. */
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
actionBar = getSupportActionBar();
if (actionBar != null)
actionBar.setTitle(mTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
/** Called when a drawer has settled in a completely open state. */
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
actionBar = getSupportActionBar();
if(actionBar != null)
actionBar.setTitle(mDrawerTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
// Set the drawer toggle as the DrawerListener
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerToggle.setDrawerIndicatorEnabled(true);
actionBar = getSupportActionBar();
if(actionBar != null)
{
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
}
mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// make Toast when click
selectItemFragment(position);
}
});
// Search List:
searchResultList = (ListView)findViewById(R.id.lvBooks);
bookList = new ArrayList<>();
adapter = new ArrayAdapter<Book>(this, R.layout.row_layout, bookList){
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = View.inflate(MainActivity.this, R.layout.row_layout, null);
}
ImageView picture = (ImageView) convertView.findViewById(R.id.book_picture);
TextView title = (TextView) convertView.findViewById(R.id.book_name);
TextView author = (TextView) convertView.findViewById(R.id.book_author);
TextView genre = (TextView) convertView.findViewById(R.id.book_genre);
TextView price = (TextView) convertView.findViewById(R.id.book_price);
Book book = this.getItem(position);
picture.setImageResource(book.getBookPicture());
title.setText(book.getBookName());
author.setText(book.getAuthorName());
genre.setText(book.getGenre());
price.setText(Double.toString(book.getPrice()));
return convertView;
}
};
searchResultList.setAdapter(adapter);
try {
Book bd1 = new Book(R.mipmap.shulhan_aruh, "Genre 1", "Book 1", "Author 1", 100);
backend.addBook(bd1);
Book bd2 = new Book(R.mipmap.kaf_hahaim, "Genre 1", "Book 2", "Author 2", 89);
adapter.addAll(backend.getBooksList());
} catch (Exception e) {
Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
}
// Click on item in book list:
searchResultList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
startActivity(new Intent(MainActivity.this, Details.class));
}
});
// initItemByListView(2);
}
// TODO change sign in to sign out when signed
private void selectItemFragment(int position){
Fragment fragment = null;
switch(position) {
default:
case 0:
startActivity(new Intent(this, Login.class));
return;
case 1:
fragment = new PurchaseHistoryFragment();
break;
case 2:
fragment = new DefaultFragment();
break;
case 3:
fragment = new DefaultFragment();
break;
case 4:
fragment = new DefaultFragment();
break;
}
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.lvBooks, fragment).commit();
mDrawerList.setItemChecked(position, true);
// setTitle(titles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
actionBar = getSupportActionBar();
if(actionBar != null)
actionBar.setTitle(mTitle);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
@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, menu);
return true;
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// If the nav drawer is open, hide action items related to the content view
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
mSearchAction = menu.findItem(R.id.action_search);
searchView = (SearchView)mSearchAction.getActionView();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
adapter.clear();
adapter.addAll(backend.searchForBook(query));
return true;
}
@Override
public boolean onQueryTextChange(String newText) {
return false;
}
});
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button_enabled, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
switch (id) {
case R.id.action_search:
handleMenuSearch();
return true;
}
return mDrawerToggle.onOptionsItemSelected(item) || super.onOptionsItemSelected(item);
}
protected void handleMenuSearch(){
actionBar = getSupportActionBar(); //get the actionbar
if(isSearchOpened){ //test if the search is open
if(actionBar != null)
{
actionBar.setDisplayShowCustomEnabled(false); //disable a custom view inside the actionbar
actionBar.setDisplayShowTitleEnabled(true); //show the title in the action bar
}
// add the search icon in the action bar
mSearchAction.setIcon(getResources().getDrawable(R.drawable.ic_search));
isSearchOpened = false;
}
else
{ // open the search entry
if(actionBar != null)
{
actionBar.setDisplayShowCustomEnabled(true); //enable it to display a
// custom view in the action bar.
// action.setCustomView(R.layout.search_bar);//add the custom view
actionBar.setDisplayShowTitleEnabled(false); //hide the title
}
// add the close icon
mSearchAction.setIcon(getResources().getDrawable(R.drawable.ic_search));
isSearchOpened = true;
}
}
@Override
public void onBackPressed() {
if(isSearchOpened) {
handleMenuSearch();
return;
}
super.onBackPressed();
}
}
当选择导航抽屉中的一个项目（第一个除外）时，程序会崩溃
我试图解决它很长一段时间
我认为（并且不确定）问题出在getView()函数中。
这是logcat：
FATAL EXCEPTION: main
java.lang.UnsupportedOperationException: addView(View) is not supported in AdapterView
at android.widget.AdapterView.addView(AdapterView.java:451)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1083)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1248)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1613)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:517)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
我很难理解应用程序在哪一行崩溃 无论如何，这是应用程序崩溃前最新命令的顺序：
然后此代码在AbsListView.java中：
if (incrementalDeltaY != 0) {
// Coming back to 'real' list scrolling
if (mScrollY != 0) {
mScrollY = 0;
invalidateParentIfNeeded();
}
此代码位于Handler.java中：
public void dispatchMessage(Message msg) {
if (msg.callback != null) {
handleCallback(msg);
} else {
if (mCallback != null) {
if (mCallback.handleMessage(msg)) {
return;
}
}
handleMessage(msg);
}
}
然后在Looper.java中循环并崩溃：
for (;;) {
Message msg = queue.next(); // might block
if (msg == null) {
// No message indicates that the message queue is quitting.
return;
}
希望您能通过上述信息找到解决方案。