在我的MainScreen.java课程中，当我点击图片时，我正在调用startActivityForResult()方法：
case R.id.add_device_btn:
case R.id.add_device_btn_text:
startActivityForResult(new Intent(MainScreen.this, DeviceDiscovery.class), REQUEST_DISCOVERY);
break;
在我的DeviceDiscovery课程中，当我点击列表项
@Override
protected void onListItemClick(ListView lv, View view, int position, long id) {
super.onListItemClick(lv, view, position, id);
// since user selected already a device we do not need to scan for more devices
localDevice.stopScan();
final String address = ((RemoteDevice)adapter.getItem(position)).getAddress();
Intent i = new Intent();
i.putExtra(ADDRESS_EXTRA, address);
setResult(RESULT_OK, i);
finish();
}
我这样做是因为当我点击列表时，它应该转到onActivityResult()方法。
但是现在当我点击列表项时整个应用程序都关闭了，控件不会转到那个onActivityResult()方法。
那么如何解决这个问题？
onActivityResult（）方法
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch(requestCode){
case REQUEST_DISCOVERY:
if (resultCode == RESULT_OK){
String address = data.getStringExtra(DeviceDiscovery.ADDRESS_EXTRA);
// add only if device is not already in the list
if (!devices.deviceEntries.contains(new BTDevice(address))){
db.open();
db.createDevice(new BTDevice(LocalDevice.getInstance().getRemoteForAddr(address)));
devices.deviceEntries = db.fetchAllDevices();
db.close();
devices.notifyDataSetChanged();
}
else {
Logger.d(TAG, "Duplicate entry: device already added");
Toast.makeText(this, "Selected device is already in your list", Toast.LENGTH_SHORT).show();
}
}
break;
}
}
这是我的MainScreen类
public class MainScreen extends ListActivity implements OnClickListener{
public static final int REQUEST_DISCOVERY = 2;
private static final int MENU_ITEM_SHOW_EVENTS = 1;
private static final int MENU_ITEM_CONNECT = 2;
private static final int MENU_ITEM_REMOVE_DEVICE = 3;
private static final int MENU_ITEM_MOVE_UP = 4;
private static final int MENU_ITEM_MOVE_DOWN = 5;
private static final int MENU_ABOUT = 10;
private static final int DIALOG_ABOUT = 1;
AmarinoDbAdapter db;
DeviceListAdapter devices;
boolean isBound = false;
MyHandler handler = new MyHandler();
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action == null) return;
Logger.d(TAG, action + " received");
if (AmarinoIntent.ACTION_CONNECTED_DEVICES.equals(action)){
updateDeviceStates(intent.getStringArrayExtra(AmarinoIntent.EXTRA_CONNECTED_DEVICE_ADDRESSES));
return;
}
final String address = intent.getStringExtra(AmarinoIntent.EXTRA_DEVICE_ADDRESS);
if (address == null) return;
Message msg = new Message();
if (AmarinoIntent.ACTION_CONNECTED.equals(action)){
msg.what = MyHandler.CONNECTED;
}
else if (AmarinoIntent.ACTION_DISCONNECTED.equals(action)){
msg.what = MyHandler.DISCONNECTED;
}
else if (AmarinoIntent.ACTION_CONNECTION_FAILED.equals(action)){
msg.what = MyHandler.CONNECTION_FAILED;
}
else if (AmarinoIntent.ACTION_PAIRING_REQUESTED.equals(action)){
msg.what = MyHandler.PAIRING_REQUESTED;
}
else return;
msg.obj = address;
handler.sendMessage(msg);
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Logger.d(TAG, "onCreate");
setContentView(R.layout.main);
findViewById(R.id.add_device_btn).setOnClickListener(this);
findViewById(R.id.add_device_btn_text).setOnClickListener(this);
findViewById(R.id.monitoring_btn).setOnClickListener(this);
findViewById(R.id.monitoring_btn_text).setOnClickListener(this);
findViewById(R.id.settings_btn).setOnClickListener(this);
findViewById(R.id.settings_btn_text).setOnClickListener(this);
/* Since the settings button is not used so far, I hide it */
findViewById(R.id.settings_btn_layout).setVisibility(View.GONE);
db = new AmarinoDbAdapter(this);
db.open();
devices = new DeviceListAdapter(this, db.fetchAllDevices());
db.close();
setListAdapter(devices);
registerForContextMenu(getListView());
showReleaseNotes();
}
private void showReleaseNotes() {
SharedPreferences prefs = getPreferences(MODE_PRIVATE);
int versionCode = getVersionCode();
if (prefs.getInt(PREF_VERSION, 0) != versionCode){
showDialog(DIALOG_ABOUT);
prefs.edit().putInt(PREF_VERSION, versionCode).commit();
}
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onResume() {
super.onResume();
// listen for device state changes
IntentFilter intentFilter = new IntentFilter(AmarinoIntent.ACTION_CONNECTED_DEVICES);
//intentFilter.addAction(AmarinoIntent.ACTION_CONNECTED);
//intentFilter.addAction(AmarinoIntent.ACTION_DISCONNECTED);
intentFilter.addAction(AmarinoIntent.ACTION_CONNECTION_FAILED);
intentFilter.addAction(AmarinoIntent.ACTION_PAIRING_REQUESTED);
registerReceiver(receiver, intentFilter);
// request state of devices
Intent intent = new Intent(this, AmarinoService.class);
intent.setAction(AmarinoIntent.ACTION_GET_CONNECTED_DEVICES);
startService(intent);
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(receiver);
}
@Override
protected void onStop() {
super.onStop();
}
@Override
protected void onDestroy() {
super.onDestroy();
}
private void updateDeviceStates(String[] connectedDevices){
if (connectedDevices == null) {
Logger.d(TAG, "no connected devices");
for (BTDevice device : devices.deviceEntries){
Message msg = new Message();
msg.what = MyHandler.DISCONNECTED;
msg.obj = device.address;
handler.sendMessage(msg);
}
return;
}
Logger.d(TAG, "connected devices detected: " + connectedDevices.length);
for (BTDevice device : devices.deviceEntries){
boolean connected = false;
Message msg = new Message();
// this is normally a very short list, not matter that this is in O(n^2)
for (int i=0; i<connectedDevices.length; i++){
if (connectedDevices[i].equals(device.address)){
msg.what = MyHandler.CONNECTED;
connected = true;
break;
}
}
if (!connected){
msg.what = MyHandler.DISCONNECTED;
}
msg.obj = device.address;
handler.sendMessage(msg);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(Menu.NONE, MENU_ABOUT, Menu.FIRST, R.string.menu_about)
.setIcon(R.drawable.about_icon);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case MENU_ABOUT:
showDialog(DIALOG_ABOUT);
}
return super.onOptionsItemSelected(item);
}
@Override
protected Dialog onCreateDialog(int id) {
Dialog dialog;
switch(id) {
case DIALOG_ABOUT:
dialog = getAboutBox();
break;
default:
dialog = null;
}
return dialog;
}
private AlertDialog getAboutBox() {
String title = getString(R.string.app_name) + " build " + getVersion(this);
return new AlertDialog.Builder(MainScreen.this)
.setTitle(title)
.setView(View.inflate(this, R.layout.about, null))
.setIcon(R.drawable.icon_small)
.setPositiveButton("OK", null)
.create();
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
// Setup the menu header
AdapterView.AdapterContextMenuInfo info;
info = (AdapterView.AdapterContextMenuInfo) menuInfo;
BTDevice device = devices.deviceEntries.get(info.position);
menu.setHeaderTitle(device.name);
menu.add(0, MENU_ITEM_CONNECT, 0,
device.state == AmarinoIntent.DISCONNECTED ? R.string.connect : R.string.disconnect);
menu.add(0, MENU_ITEM_SHOW_EVENTS, 0, R.string.show_events);
menu.add(0, MENU_ITEM_REMOVE_DEVICE, 0, R.string.remove_device);
//menu.add(0, MENU_ITEM_MOVE_UP, 0, "Move up");
//menu.add(0, MENU_ITEM_MOVE_DOWN, 0, "Move down");
}
@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterView.AdapterContextMenuInfo info;
info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
BTDevice device = devices.deviceEntries.get(info.position);
switch (item.getItemId()) {
case MENU_ITEM_REMOVE_DEVICE:
// before we remove the device, we disconnect it if connected
if (device.state == AmarinoIntent.CONNECTED){
Toast.makeText(this, "Please disconnect the device before removing it!", Toast.LENGTH_SHORT).show();
}
else {
db.open();
db.deleteDevice(device.id);
devices.deviceEntries = db.fetchAllDevices();
db.close();
devices.notifyDataSetChanged();
}
return true;
case MENU_ITEM_SHOW_EVENTS:
onEventListBtnClick(info.position);
return true;
case MENU_ITEM_CONNECT:
Button btn = (Button) info.targetView.findViewById(R.id.connect_btn);
onConnectBtnClick(btn, info.position);
return true;
case MENU_ITEM_MOVE_UP:
// TODO move this selected device one position up
return true;
case MENU_ITEM_MOVE_DOWN:
// TODO move this selected device one position down
return true;
}
return false;
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
openContextMenu(v);
}
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.connect_btn:
Button btn = (Button)v;
int postion = (Integer) v.getTag();
onConnectBtnClick(btn, postion);
break;
case R.id.list_btn:
int pos = (Integer) v.getTag();
onEventListBtnClick(pos);
break;
case R.id.add_device_btn:
case R.id.add_device_btn_text:
Intent obj=new Intent(MainScreen.this,DeviceDiscovery.class);
//getParent().
startActivityForResult(obj,1001);
break;
case R.id.monitoring_btn:
case R.id.monitoring_btn_text:
startActivity(new Intent(MainScreen.this, Monitoring.class));
break;
case R.id.settings_btn:
case R.id.settings_btn_text:
// TODO Perhaps we need a settings button in the future
Toast.makeText(this, "not implemented yet", Toast.LENGTH_SHORT).show();
break;
}
}
private void onConnectBtnClick(Button btn, int postion) {
Intent i = new Intent(MainScreen.this, AmarinoService.class);
i.putExtra(AmarinoIntent.EXTRA_DEVICE_ADDRESS, devices.deviceEntries.get(postion).address);
if ( btn.getText().equals(getString(R.string.connect)) )
i.setAction(AmarinoIntent.ACTION_CONNECT);
else
i.setAction(AmarinoIntent.ACTION_DISCONNECT);
btn.setEnabled(false);
btn.setText(R.string.connecting);
startService(i);
}
private void onEventListBtnClick(int pos){
Intent intent = new Intent(MainScreen.this, EventListActivity.class);
intent.putExtra(AmarinoIntent.EXTRA_DEVICE, devices.deviceEntries.get(pos));
startActivity(intent);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Toast.makeText(getApplicationContext(), "In mAIn", Toast.LENGTH_SHORT).show();
//super.onActivityResult(requestCode, resultCode, data);
switch(requestCode){
case 1001:
if (resultCode == RESULT_OK){
String address = data.getStringExtra(DeviceDiscovery.ADDRESS_EXTRA);
// add only if device is not already in the list
if (!devices.deviceEntries.contains(new BTDevice(address))){
db.open();
db.createDevice(new BTDevice(LocalDevice.getInstance().getRemoteForAddr(address)));
devices.deviceEntries = db.fetchAllDevices();
db.close();
devices.notifyDataSetChanged();
}
else {
Logger.d(TAG, "Duplicate entry: device already added");
Toast.makeText(this, "Selected device is already in your list", Toast.LENGTH_SHORT).show();
}
}
break;
}
}
private class MyHandler extends Handler {
protected static final int CONNECTED = 1;
protected static final int DISCONNECTED = 2;
protected static final int CONNECTION_FAILED = 3;
protected static final int PAIRING_REQUESTED = 4;
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
final int what = msg.what;
final String address = (String)msg.obj;
for (int i=0; i<devices.getCount();i++){
BTDevice device = (BTDevice)devices.getItem(i);
if (address.equals(device.address)){
View view = getListView().getChildAt(i);
Button btn = (Button)view.findViewById(R.id.connect_btn);
btn.setEnabled(true);
switch (what) {
case CONNECTED:
setDeviceConnected(device, view, btn);
break;
case CONNECTION_FAILED:
Toast.makeText(MainScreen.this, "Connection failed!", Toast.LENGTH_SHORT).show();
case DISCONNECTED:
setDeviceDisconnected(device, view, btn);
break;
case PAIRING_REQUESTED:
Toast.makeText(MainScreen.this,
"Device is not paired!\n\nPlease pull-down the notification bar to pair your device.\n\n", Toast.LENGTH_LONG).show();
setDeviceDisconnected(device, view, btn);
break;
}
view.invalidate();
}
} // end for
} // end handleMessage()
private void setDeviceConnected(BTDevice device, View view, Button btn) {
device.state = AmarinoIntent.CONNECTED;
view.findViewById(R.id.connected).setBackgroundResource(R.color.connected_on);
view.findViewById(R.id.disconnected).setBackgroundResource(R.color.disconnected_off);
btn.setText(R.string.disconnect);
}
private void setDeviceDisconnected(BTDevice device, View view, Button btn) {
device.state = AmarinoIntent.DISCONNECTED;
view.findViewById(R.id.connected).setBackgroundResource(R.color.connected_off);
view.findViewById(R.id.disconnected).setBackgroundResource(R.color.disconnected_on);
btn.setText(R.string.connect);
}
}
public static String getVersion(Context context) {
String version = "1.0";
try {
PackageInfo pi = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
version = pi.versionName;
} catch (PackageManager.NameNotFoundException e) {
Log.e(TAG, "Package name not found", e);
}
return version;
}
private int getVersionCode() {
int code = 1;
try {
PackageInfo pi = getPackageManager().getPackageInfo(getPackageName(), 0);
code = pi.versionCode;
} catch (PackageManager.NameNotFoundException e) {
Log.e(TAG, "Package name not found", e);
}
return code;
}
private class DeviceListAdapter extends BaseAdapter {
ArrayList<BTDevice> deviceEntries;
Context context;
@SuppressWarnings("unused")
public DeviceListAdapter(Context context){
this.context = context;
}
public DeviceListAdapter(Context context, ArrayList<BTDevice> deviceEntries){
this.context = context;
this.deviceEntries = deviceEntries;
}
public int getCount() {
if (deviceEntries != null) {
return deviceEntries.size();
}
return 0;
}
public Object getItem(int position) {
return deviceEntries.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
LinearLayout view = null;
BTDevice device = deviceEntries.get(position);
if (convertView == null) {
view = new LinearLayout(context);
LayoutInflater vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
vi.inflate(R.layout.devices_list_item, view, true);
} else {
view = (LinearLayout) convertView;
}
TextView name = (TextView) view.findViewById(R.id.device_name);
TextView address = (TextView) view.findViewById(R.id.device_address);
Button eventListBtn = (Button) view.findViewById(R.id.list_btn);
Button connectBtn = (Button) view.findViewById(R.id.connect_btn);
// lets remember which address is associated with our buttons
connectBtn.setTag(position);
eventListBtn.setTag(position);
connectBtn.setOnClickListener(MainScreen.this);
eventListBtn.setOnClickListener(MainScreen.this);
name.setText((name==null) ? "NONAME" : device.name);
address.setText(device.address);
return view;
}
}
}
这是我的DeviceDiscovery类
public class DeviceDiscovery extends ListActivity {
protected static String ADDRESS_EXTRA = "device_address";
public static final int REQUEST_DISCOVERY = 2;
@SuppressWarnings("unused")
private static final String TAG = "DeviceDiscovery";
private DeviceAdapter adapter;
private LocalDevice localDevice;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle("Discovered Devices");
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.discovered_devices_list);
adapter = new DeviceAdapter();
setListAdapter(adapter);
setProgressBarIndeterminateVisibility(true);
localDevice = LocalDevice.getInstance();
}
@Override
protected void onStart() {
super.onStart();
localDevice.init(this, new ReadyListener(){
@Override
public void ready() {
localDevice.scan(new ScanListener(){
@Override
public void deviceFound(RemoteDevice device) {
synchronized(adapter.discoveredDevices){
Vector<RemoteDevice> addedDevices = adapter.discoveredDevices;
for (RemoteDevice rd : addedDevices){
if (rd.getAddress().equals(device.getAddress())){
Log.d(TAG, "device already in list -> renew");
adapter.discoveredDevices.remove(rd);
}
}
adapter.discoveredDevices.add(device);
}
adapter.notifyDataSetChanged();
}
@Override
public void scanCompleted() {
setProgressBarIndeterminateVisibility(false);
}
});
} // end ready()
});
}
@Override
protected void onStop() {
super.onStop();
// TODO change source of AndroidBluetoothLibrary to fix the bug
// this might run in an exception, because of a race condition
// see issue 22 at http://code.google.com/p/android-bluetooth/issues/detail?id=22
localDevice.destroy();
}
@Override
protected void onListItemClick(ListView lv, View view, int position, long id) {
super.onListItemClick(lv, view, position, id);
// since user selected already a device we do not need to scan for more devices
localDevice.stopScan();
final String address = ((RemoteDevice)adapter.getItem(position)).getAddress();
Intent i = new Intent();
i.putExtra(ADDRESS_EXTRA, address);
setResult(RESULT_OK, i);
finish();
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
}
private class DeviceAdapter extends BaseAdapter {
Vector<RemoteDevice> discoveredDevices = new Vector<RemoteDevice>();
public int getCount() {
if (discoveredDevices != null) {
return discoveredDevices.size();
}
return 0;
}
public Object getItem(int position) {
return discoveredDevices.get(position);
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
LinearLayout view = null;
if (convertView == null) {
view = new LinearLayout(DeviceDiscovery.this);
String inflater = Context.LAYOUT_INFLATER_SERVICE;
LayoutInflater vi = (LayoutInflater) DeviceDiscovery.this.getSystemService(inflater);
vi.inflate(R.layout.discovered_devices_list_item, view, true);
} else {
view = (LinearLayout) convertView;
}
TextView addressTextView = (TextView) view.findViewById(R.id.device_address);
TextView nameTextView = (TextView) view.findViewById(R.id.device_name);
RemoteDevice device = discoveredDevices.get(position);
String address = device.getAddress();
String name = device.getFriendlyName();
addressTextView.setText(address);
nameTextView.setText((name==null) ? "NONAME" : name);
return view;
}
}
}
我仍然无法找到解决方案，它仍然关闭整个应用程序，而且它也不会使用onActivityResult（）方法
答案 0 :(得分：0)
我得到了答案， 就像我忘了删除
android:noHistory="true"
，现在我删除了它，现在它正常工作。
感谢所有人的回复。