我有一个包含 3 个片段的 ViewPager 的活动。每个片段都包含一个列表视图，我希望在单击列表项时启动一个新活动。
我无法从 onItemClickListener 运行 startActivity() 方法。帮助！
BTListDevice.java
package com.example.pager;
import java.util.Set;
import android.support.v4.app.Fragment;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class BTListDevice extends FragmentActivity {
// Fragments
AppSectionsPagerAdapter mAppSectionsPagerAdapter;
ViewPager mViewPager;
// Debugging
private static final String TAG = "BluetoothChat";
private static final boolean D = true;
// Message types sent from the BluetoothChatService Handler
public static final int MESSAGE_STATE_CHANGE = 1;
public static final int MESSAGE_READ = 2;
public static final int MESSAGE_WRITE = 3;
public static final int MESSAGE_DEVICE_NAME = 4;
public static final int MESSAGE_TOAST = 5;
// Key names received from the BluetoothChatService Handler
public static final String DEVICE_NAME = "device_name";
public static final String TOAST = "toast";
// Intent request codes
private static final int REQUEST_CONNECT_DEVICE_SECURE = 1;
private static final int REQUEST_CONNECT_DEVICE_INSECURE = 2;
// Return Intent extra
public static String DEVICE_DET = "dev";
private static final int REQUEST_ENABLE_BT = 7;
// Member fields
private static BluetoothAdapter mBtAdapter;
private static DevicesCursor devicesAdapter;
private static ChatDBHelper dbHelper;
private static ListView pairedListView;
private ListView newDevicesListView;
private static ListView homeList;
private static HomeListAdapter iAdap;
boolean buttonState;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Get Default Adapter for the device
mBtAdapter = BluetoothAdapter.getDefaultAdapter();
dbHelper = new ChatDBHelper(this);
if (mBtAdapter.isEnabled())
buttonState=true;
else
buttonState=false;
invalidateOptionsMenu();
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.activity_navigator);
// Create the adapter that will return a fragment for each of the three primary sections
// of the app.
mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager, attaching the adapter and setting up a listener for when the
// user swipes between sections.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mAppSectionsPagerAdapter);
mViewPager.setCurrentItem(1);
// Set result CANCELED in case the user backs out
setResult(Activity.RESULT_CANCELED);
}
@Override
protected void onResume() {
super.onResume();
if (mBtAdapter.isEnabled())
buttonState=true;
else
buttonState=false;
invalidateOptionsMenu();
}
@Override
protected void onDestroy() {
super.onDestroy();
// Make sure we're not doing discovery anymore
if (mBtAdapter != null) {
mBtAdapter.cancelDiscovery();
}
// Unregister broadcast listeners
this.unregisterReceiver(mReceiver);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.home_screen_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch(item.getItemId()) {
case R.id.menu_BT :
{
if (!mBtAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
//Toast.makeText(getApplicationContext(), "Enabling Bluetooth..", Toast.LENGTH_SHORT).show();
}
else {
if (mBtAdapter.isEnabled()) {
mBtAdapter.disable();
buttonState=false;
invalidateOptionsMenu();
//Toast.makeText(getApplicationContext(), "Disabling Bluetooth..", Toast.LENGTH_SHORT).show();
}
}
}
return true;
default :
return super.onOptionsItemSelected(item);
}
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
MenuItem BT = menu.findItem(R.id.menu_BT);
if(buttonState)
{
BT.setIcon(R.drawable.bt_on);
return true;
}
else
BT.setIcon(R.drawable.bt_off);
return super.onPrepareOptionsMenu(menu);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
switch(requestCode)
{
case REQUEST_ENABLE_BT : {
if(resultCode==RESULT_OK)
{
buttonState=true;
invalidateOptionsMenu();
// Get a set of currently paired devices
Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();
String text = String.valueOf(pairedDevices.size());
Toast.makeText(getApplicationContext(),text, Toast.LENGTH_SHORT).show();
if (pairedDevices.size() > 0)
{
dbHelper.DTdelAllData();
for (BluetoothDevice device : pairedDevices)
{
dbHelper.DTinsertData(device.getAddress(), device.getName());
}
}
}
else
{
buttonState=false;
invalidateOptionsMenu();
}
}
break;
}
}
public void searchForDevices(View v)
{
if (mBtAdapter == null) {
Toast.makeText(getApplicationContext(), "Device not supported!", Toast.LENGTH_LONG).show();
return;
}
else
{
if (!mBtAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
//Toast.makeText(getApplicationContext(), "Enabling Bluetooth..", Toast.LENGTH_LONG).show();
}
else
{
doDiscovery();
v.setVisibility(View.GONE);
}
}
}
private void doDiscovery() {
//if (D) Log.d(TAG, "doDiscovery()");
// Indicate scanning in the title
setProgressBarIndeterminateVisibility(true);
setTitle("Scanning");
// If we're already discovering, stop it
if (mBtAdapter.isDiscovering()) {
mBtAdapter.cancelDiscovery();
}
// Request discover from BluetoothAdapter
mBtAdapter.startDiscovery();
}
// The on-click listener for all devices in the ListViews
static OnItemClickListener mDeviceClickListener = new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {
// Cancel discovery because it's costly and we're about to connect
mBtAdapter.cancelDiscovery();
Cursor c = dbHelper.DTgetAllData();
c.moveToPosition(arg2);
String device = c.getString(0);
// Create the result Intent and include the MAC address
Intent intent = new Intent(BTListDevice.this,ChatActivity.class);
intent.putExtra(DEVICE_DET, device);
// Set result and finish this Activity
BTListDevice.this.startActivity(intent);
}
};
public class AppSectionsPagerAdapter extends FragmentPagerAdapter {
Fragment frag;
public AppSectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int i) {
switch (i) {
case 0 :
frag = new PairedDevicesFragment();
break;
case 2 :
frag = new NewDevicesFragment();
break;
case 1 :
frag = new HomeScreenFragment();
break;
default :
frag = new HomeScreenFragment();
}
return frag;
}
@Override
public int getCount() {
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
String title = null;
switch(position)
{
case 0 : title = "Paired Devices";
break;
case 1 : title = "Chats";
break;
case 2 : title = "New Devices";
break;
}
return (CharSequence)title;
}
}
public static class PairedDevicesFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.paired_devices, container, false);
// Find and set up the ListView for paired devices
pairedListView = (ListView) rootView.findViewById(R.id.paired_devices);
pairedListView.setOnItemClickListener(mDeviceClickListener);
new Handler().post(new Runnable() {
@Override
public void run() {
devicesAdapter = new DevicesCursor(getActivity().getApplicationContext(), dbHelper.DTgetAllData());
pairedListView.setAdapter(devicesAdapter);
}
});
return rootView;
}
}
public static class NewDevicesFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.new_devices, container, false);
// Find and set up the ListView for paired devices
pairedListView = (ListView) rootView.findViewById(R.id.new_devices);
pairedListView.setOnItemClickListener(BTListDevice.mDeviceClickListener);
return rootView;
}
}
public static class HomeScreenFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.home_screen, container, false);
homeList = (ListView)rootView.findViewById(android.R.id.list);
Cursor cur = dbHelper.CTgetChatDevices();
cur.moveToFirst();
if(cur.getCount()>0)
{
new Handler().post(new Runnable() {
@Override
public void run() {
iAdap = new HomeListAdapter(getActivity().getApplicationContext());
homeList.setAdapter(iAdap);
}
});
}
else
{
TextView empty = (TextView)rootView.findViewById(android.R.id.empty);
empty.setText("There is No Cheese!");
empty.setVisibility(View.VISIBLE);
homeList.setVisibility(View.GONE);
}
return rootView;
}
}
}
编辑：当我尝试调用 startActivity() 时，我在 onItemClickListener 中收到此错误。
Cannot make a static reference to the non-static method startActivity(Intent) from the type Activity.