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这是我的应用程序的代码，我想从我的应用程序调用API。这是一个Web API，我已经写好了我的自我它的链接是projectbuddy-1.apphb.com/api/[email protected]&pass=123 这是我的代码，我想获得用户的数据和分析它，并使用意向调用Api崩溃Android应用程序
package com.example.ali.projectbuddy;
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.database.Cursor;
import android.widget.Toast;
import android.app.Activity;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONObject;
import android.media.Image;
public class SignIn extends Activity {
String data = null;
String url;
Database.User user = null;
Button Login=null;
boolean verified=false;
String id = null;
String pass=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sign_in);
Toast.makeText(com.example.ali.projectbuddy.SignIn.this,"Hi",Toast.LENGTH_LONG).show();
// get the Refferences of views
}
public void LoginClicked(View v)
{
boolean isConnected = isNetworkAvailable();
if(isConnected == true)
{
Toast.makeText(getApplicationContext() , "Is Connected" ,Toast.LENGTH_SHORT).show();
EditText editTextUserName = (EditText) findViewById(R.id.Email);
EditText editTextPassword = (EditText) findViewById(R.id.Password);
// get The User name and Password
id = editTextUserName.getText().toString();
pass = editTextPassword.getText().toString();
String id1;
String pass1;
id1=id;
pass1=pass;
if(id1.isEmpty() && pass1.isEmpty())
{
Toast.makeText(getApplicationContext() , "Please enter your username and password" ,Toast.LENGTH_SHORT).show();
}
else if(id1.isEmpty())
{
Toast.makeText(getApplicationContext() , "Please enter your username" ,Toast.LENGTH_SHORT).show();
}
else if(pass1.isEmpty())
{
Toast.makeText(getApplicationContext() , "Please enter your password" ,Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(getApplicationContext() , "Calling Api" ,Toast.LENGTH_SHORT).show();
url = "http://projectbuddy-1.apphb.com/api/[email protected]&pass=123";
MyAsynchTask task=new MyAsynchTask();
task.execute();
}
}
else
{
Toast.makeText(getApplicationContext() , "No Network connection, please try again." ,Toast.LENGTH_LONG).show();
}
}
public boolean isNetworkAvailable() {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(getApplicationContext().CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
public class MyAsynchTask extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
Toast.makeText(getApplicationContext() , "On PreExecute" ,Toast.LENGTH_SHORT).show();
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... void0) {
try {
ServiceHandler obj = new ServiceHandler();
data = obj.makeServiceCall(url, ServiceHandler.GET);
} catch (Exception e) {
data = "Unable to locate server.";
}
try {
Toast.makeText(getApplicationContext() , "Getting JSON onject" ,Toast.LENGTH_SHORT).show();
JSONObject object = new JSONObject(data);
user.name = object.getString("name");
user.country = object.getString("country");
user.city = object.getString("city");
user.id = object.getInt("user_id");
user.mobileNo = object.getString("mobileNo");
// user.image=(Image)object.get("image");
} catch (Exception ex) {
}
return null;
}
@Override
protected void onPostExecute(Void abc) {
super.onPostExecute(abc);
if(user.equals(null))
{
verified=false;
Toast.makeText(getApplicationContext(), "UserName or Password Incorrect", Toast.LENGTH_LONG).show();
}
else if(data.contains("Unable to locate server"))
{
verified=false;
Toast.makeText(getApplicationContext(), "Unable to Locate Server.Check your Internet Connection.", Toast.LENGTH_LONG).show();
}
else
{
// Editor editor = sharedpreferences.edit();
verified=true;
Intent i = new Intent(getApplicationContext(),Welcome_Page.class);
i.putExtra("username",user.name);
i.putExtra("useremail",user.email);
i.putExtra("userid",user.id);
i.putExtra("usermobileno",user.mobileNo);
i.putExtra("usercountry",user.country);
i.putExtra("usercity",user.city);
i.putExtra("Verified",verified);
startActivity(i);
}
}
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
/*
public void SignInClick2(View v) {
// Toast.makeText(com.example.ali.projectbuddy.SignIn.this,"Hi3",Toast.LENGTH_LONG).show();
Intent i = new Intent(SignIn.this,Welcome_Page.class);
i.putExtra("username",user.name);
i.putExtra("useremail",user.email);
i.putExtra("userid",user.id);
i.putExtra("usermobileno",user.mobileNo);
i.putExtra("usercountry",user.country);
i.putExtra("usercity",user.city);
startActivity(i);
}*/
public void SignUpClick(View v) {
Intent i = new Intent(this, SignUp.class);
startActivity(i);
}
}
这是我的XML
它发送到下一个活动<RelativeLayout 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"
android:background="@color/material_blue_grey_800"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.ali.projectbuddy..Login" >
<GridLayout
android:layout_width="fill_parent"
android:layout_height="300px"
android:layout_alignParentStart="true"
android:id="@+id/gridLayout">
<ImageView
android:layout_width="96dp"
android:layout_height="143dp"
android:id="@+id/imageView"
android:layout_row="0"
android:layout_column="0"
android:background="@drawable/icon1"/>
<TextView android:text="@string/Project"
android:textSize="18pt"
android:textAlignment="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#73e0f4"
style="@style/Base.TextAppearance.AppCompat.Title"
android:background="@color/material_blue_grey_800"
android:id="@+id/textView"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_row="0"
android:layout_column="8" />
</GridLayout>
<EditText
android:id="@+id/Email"
android:layout_width="match_parent"
android:layout_height="32dp"
android:layout_centerHorizontal="true"
android:layout_marginTop="200dp"
android:textSize="22dp"
android:textColor="#FFFFFF"
android:background="#07000000"
android:ems="10"
android:hint="Email"
android:inputType="textEmailAddress"
>
<requestFocus />
</EditText>
<EditText
android:id="@+id/Password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_below="@id/Email"
android:layout_marginTop="27dp"
android:ems="10"
android:textSize="22dp"
android:textColor="#FFFFFF"
android:background="#07000000"
android:hint="Password"
android:inputType="textWebPassword" />
<TextView
android:id="@+id/ForgetPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFFFFF"
android:text="ForgetPassword"
android:textSize="22dp"
android:onClick="ForgetPasswordClick"
android:layout_below="@+id/SignUp"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<TextView
android:id="@+id/SignUp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New User? Want to SignUp?"
android:textSize="22dp"
android:onClick="SignUpClick"
android:layout_marginTop="40dp"
android:textColor="#FFFFFF"
android:layout_below="@+id/Password"
android:layout_alignParentStart="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="@+id/button"
android:clickable="true"
android:layout_alignParentBottom="true"
android:layout_alignEnd="@+id/Password" />
</RelativeLayout>
请帮忙。谢谢大家 我的Logcat显示这个 06-01 00：02：23.717 3714-3714/com.example.ali.projectbuddy E/AndroidRuntime：致命例外：main java.lang.NullPointerException at com.example.ali。在android.os.AsyncTask.finish（AsyncTask.java：）上的项目签名$ MyAsynchTask.onPostExecute（SignIn.java:162） at com.example.ali.projectbuddy.SignIn $ MyAsynchTask.onPostExecute（SignIn.java:117） 631） at android.os.AsyncTask.access $ 600（AsyncTask.java:177） at android.os.AsyncTask $ InternalHandler.handleMessage（AsyncTask.java:644） at android.os.Handler.dispatchMessage（Handler.java ：107） at android.os.Looper.loop（Looper.java:194） at android.a pp.ActivityThread.main（ActivityThread.java:5371） at java.lang.reflect.Method.invokeNative（Native Method） at java.lang.reflect.Method.invoke（Method.java:525） at com.android .internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:833） at com.android.internal.os.ZygoteInit.main（ZygoteInit.java:600） at dalvik.system.NativeStart.main（Native Method）
什么是错误？请发布整个堆栈跟踪 – Timo
使用LogCat检查与您的崩溃相关的Java堆栈跟踪：https://stackoverflow.com/questions/23353173/uncomfort-myapp-has-stopped-how-can-i-solve-this – CommonsWare
ok让我看看logcat –