我需要帮助才能找出为什么它不会进入下一个活动（例如R.id.Signin_Btn），我在另一个Activity中遇到了这个问题，这个问题在本课程完成之前完全正常工作。
我已经通过并检查了所有内容，无法找到解决此问题的方法。
public class Login extends ActionBarActivity implements View.OnClickListener {
ArrayList<Driver> DriverArrayList;
DriverAdapter Dadapter;
ArrayList<Vehicle> VehicleArrayList;
VehicleAdapter Vadapter;
ArrayList<Plot> PlotArrayList;
PlotAdapter Padapter;
ImageButton Driver_Btn;
ImageButton Vehicle_Btn;
ImageButton Plot_Btn;
Button Signin_Btn;
private Intent myIntent;
private int DriverID = 0;
private int VehicleID = 0;
private int PlotID = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
Driver_Btn = (ImageButton) findViewById(R.id.Select_Driver);
Driver_Btn.setOnClickListener(this);
Vehicle_Btn = (ImageButton) findViewById(R.id.Select_Vehicle);
Vehicle_Btn.setOnClickListener(this);
Plot_Btn = (ImageButton) findViewById(R.id.Select_Plot);
Plot_Btn.setOnClickListener(this);
Signin_Btn = (Button) findViewById(R.id.Signin_Btn);
Signin_Btn.setOnClickListener(this);
//ArrayList
DriverArrayList = new ArrayList<Driver>();
VehicleArrayList = new ArrayList<Vehicle>();
PlotArrayList = new ArrayList<Plot>();
new JSONAsyncTask().execute("N/A");
ListView DlistView = (ListView) findViewById(R.id.DriverList);
ListView VlistView = (ListView) findViewById(R.id.VehicleList);
ListView PlistView = (ListView) findViewById(R.id.PlotList);
Dadapter = new DriverAdapter(getApplicationContext(), R.layout.driver_row, DriverArrayList);
Vadapter = new VehicleAdapter(getApplicationContext(), R.layout.vehicle_row, VehicleArrayList);
Padapter = new PlotAdapter(getApplicationContext(), R.layout.plot_row, PlotArrayList);
DlistView.setAdapter(Dadapter);
VlistView.setAdapter(Vadapter);
PlistView.setAdapter(Padapter);
Driver_Btn.setBackgroundColor(Color.GREEN);
DlistView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) {
ListView VehicleListView = (ListView) findViewById(R.id.VehicleList);
DriverID = DriverArrayList.get(position).getID();
ResetButtonColours();
arg1.setSelected(true);
Vehicle_Btn.setBackgroundColor(Color.GREEN);
VehicleListView.setVisibility(View.VISIBLE);
//Toast.makeText(getApplicationContext(), DriverArrayList.get(position).getName(), Toast.LENGTH_LONG).show();
}
});
VlistView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) {
VehicleID = VehicleArrayList.get(position).getID();
ListView PlotListView = (ListView) findViewById(R.id.PlotList);
ResetButtonColours();
Plot_Btn.setBackgroundColor(Color.GREEN);
PlotListView.setVisibility(View.VISIBLE);
//Toast.makeText(getApplicationContext(), DriverArrayList.get(position).getName(), Toast.LENGTH_LONG).show();
}
});
PlistView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) {
PlotID = PlotArrayList.get(position).getID();
}
});
}
private void ResetButtonColours() {
ListView DriverListView = (ListView) findViewById(R.id.DriverList);
ListView VehicleListView = (ListView) findViewById(R.id.VehicleList);
ListView PlotListView = (ListView) findViewById(R.id.PlotList);
DriverListView.setVisibility(View.GONE);
VehicleListView.setVisibility(View.GONE);
PlotListView.setVisibility(View.GONE);
Driver_Btn.setBackgroundColor(Color.TRANSPARENT);
Vehicle_Btn.setBackgroundColor(Color.TRANSPARENT);
Plot_Btn.setBackgroundColor(Color.TRANSPARENT);
}
@Override
public void onClick(View v) {
ListView DriverListView = (ListView) findViewById(R.id.DriverList);
ListView VehicleListView = (ListView) findViewById(R.id.VehicleList);
ListView PlotListView = (ListView) findViewById(R.id.PlotList);
switch (v.getId()) {
case R.id.Select_Driver:
this.ResetButtonColours();
Driver_Btn.setBackgroundColor(Color.GREEN);
DriverListView.setVisibility(View.VISIBLE);
break;
case R.id.Select_Vehicle:
this.ResetButtonColours();
Vehicle_Btn.setBackgroundColor(Color.GREEN);
VehicleListView.setVisibility(View.VISIBLE);
break;
case R.id.Select_Plot:
this.ResetButtonColours();
Plot_Btn.setBackgroundColor(Color.GREEN);
PlotListView.setVisibility(View.VISIBLE);
break;
case R.id.Signin_Btn:
if (DriverID == 0) {
Toast.makeText(getApplicationContext(), "You haven't selected a Driver!", Toast.LENGTH_LONG).show();
} else if (VehicleID == 0) {
Toast.makeText(getApplicationContext(), "You haven't selected a Vehicle!", Toast.LENGTH_LONG).show();
} else if (PlotID == 0) {
Toast.makeText(getApplicationContext(), "You haven't selected a Plot!", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "Just a minute!", Toast.LENGTH_LONG).show();
myIntent = new Intent(this, Dashboard.class);
//myIntent.putExtra("key", value); //Optional parameters
startActivity(myIntent);
}
break;
}
}
public class JSONAsyncTask extends AsyncTask<String, Void, Boolean> {
ProgressDialog dialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog = new ProgressDialog(Login.this);
dialog.setMessage("Loading, Please Wait");
dialog.setTitle("Connecting to Server");
dialog.show();
dialog.setCancelable(false);
}
@Override
protected Boolean doInBackground(String... urls) {
try {
HttpGet HttpPost = new HttpGet(urls[0]);
HttpClient HttpClient = new DefaultHttpClient();
HttpResponse Response = HttpClient.execute(HttpPost);
int Status = Response.getStatusLine().getStatusCode();
//if (Status == 200) {
HttpEntity Entity = Response.getEntity();
String Data = EntityUtils.toString(Entity);
JSONObject Object = new JSONObject(Data);
JSONArray DriverArray = Object.getJSONArray("drivers");
for (int i = 0; i < DriverArray.length(); i++) {
JSONObject Current = DriverArray.getJSONObject(i);
Driver Driver = new Driver();
Driver.setID(Current.getInt("id"));
Driver.setName(Current.getString("name"));
DriverArrayList.add(Driver);
}
JSONArray VehicleArray = Object.getJSONArray("vehicles");
for (int i = 0; i < VehicleArray.length(); i++) {
JSONObject Current = VehicleArray.getJSONObject(i);
Vehicle Vehicle = new Vehicle();
Vehicle.setID(Current.getInt("id"));
Vehicle.setName(Current.getString("make") + ' ' + Current.getString("model"));
Vehicle.setReg("(" + Current.getString("reg") + ")");
VehicleArrayList.add(Vehicle);
}
JSONArray PlotArray = Object.getJSONArray("plots");
for (int i = 0; i < PlotArray.length(); i++) {
JSONObject Current = PlotArray.getJSONObject(i);
Plot Plot = new Plot();
Plot.setID(Current.getInt("id"));
Plot.setName(Current.getString("name"));
PlotArrayList.add(Plot);
}
} catch (JSONException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
protected void onPostExecute(Boolean result) {
dialog.cancel();
Dadapter.notifyDataSetChanged();
if (result == false) {
Toast.makeText(getApplicationContext(), "Unable to Fetch Content from Server", Toast.LENGTH_LONG).show();
}
}
}
}
答案 0 :(得分：3)
您是否已将新活动添加到清单文件中？
添加此
<activity
android:name=".Dashboard"
android:label="Dashboard" />