Android 运行时和空点异常 [英] Android Runtime and Nullpoint Exceptions

问题描述

我在一个名为 (ParseInitialization.java) 的类中进行了 Parse 初始化，该类扩展了 Application 并且在运行我的应用程序 (MainActivity.java) 时我得到了一个 RuntimeException当我在 (MainActivity.java) 中的 onCreate 中调用 Parse.initialize 时，我得到了一个 NullpointException

I have Parse initialization in a class named (ParseInitialization.java) that extends Application and while running my application (MainActivity.java) I got a RuntimeException and whene I call Parse.initialize inside onCreate in (MainActivity.java) I got a NullpointException

这是我的代码:

MainActivity.java

MainActivity.java

package com.example.baharat2;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.view.Menu;
import android.view.MenuInflater;
import com.parse.ParseAnonymousUtils;
import com.parse.ParseUser;

public class MainActivity extends Activity {
private Button signin_btn ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

signin_btn = (Button) findViewById(R.id.button1);
signin_btn.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {

        // TODO Auto-generated method stub      
        // Determine whether the current user is an anonymous user
        if (ParseAnonymousUtils.isLinked(ParseUser.getCurrentUser())) {
            // If user is anonymous, send the user to LoginSignupActivity.class
            Intent intent = new Intent(MainActivity.this,LoginSignupActivity.class);
            startActivity(intent);
            finish();
        } else {
        // If current user is NOT anonymous user
        // Get current user data from Parse.com
        ParseUser currentUser = ParseUser.getCurrentUser();
        if (currentUser != null) {
            // Send logged in users to Welcome.class
            Intent intent = new Intent(MainActivity.this, Welcome.class);
            startActivity(intent);
            finish();
        } else {
            // Send user to LoginSignupActivity.class
            Intent intent = new Intent(MainActivity.this,LoginSignupActivity.class);
            startActivity(intent);
            finish();
    }
  }
 } 
 });
}

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 MenuInflater inflater = getMenuInflater();
 inflater.inflate(R.menu.main, menu);
 return super.onCreateOptionsMenu(menu);
 }
}

解析初始化.java

package com.example.baharat2;
import android.app.Application;
import com.parse.Parse;
import com.parse.ParseACL;
import com.parse.ParseObject;
import com.parse.ParseUser;

public class ParseInitialization extends Application {
@Override
public void onCreate() {
    super.onCreate();

    // Add your initialization code here
    Parse.initialize(this, "xxx", "xxx");


    ParseUser.enableAutomaticUser();
    ParseACL defaultACL = new ParseACL();

    // If you would like all objects to be private by default, remove this line.
    defaultACL.setPublicReadAccess(true);

    ParseACL.setDefaultACL(defaultACL, true);

    ParseObject testObject = new ParseObject("TestObject");
    testObject.put("foo", "bar");
    testObject.saveInBackground();
  }
}

日志猫

03-21 11:05:56.133: E/AndroidRuntime(2348): FATAL EXCEPTION: main
03-21 11:05:56.133: E/AndroidRuntime(2348): Process: com.example.baharat2, PID: 2348
03-21 11:05:56.133: E/AndroidRuntime(2348): java.lang.RuntimeException: You must call Parse.initialize(context, oauthKey, oauthSecret) before using the Parse library.
03-21 11:05:56.133: E/AndroidRuntime(2348):     at com.parse.ParseUser.checkApplicationContext(ParseUser.java:941)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at com.parse.ParseUser.getCurrentUser(ParseUser.java:813)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at com.example.baharat2.MainActivity$1.onClick(MainActivity.java:30)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at android.view.View.performClick(View.java:4438)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at android.view.View$PerformClick.run(View.java:18422)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at android.os.Handler.handleCallback(Handler.java:733)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at android.os.Handler.dispatchMessage(Handler.java:95)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at android.os.Looper.loop(Looper.java:136)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at android.app.ActivityThread.main(ActivityThread.java:5017)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at java.lang.reflect.Method.invokeNative(Native Method)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at java.lang.reflect.Method.invoke(Method.java:515)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-21 11:05:56.133: E/AndroidRuntime(2348):     at dalvik.system.NativeStart.main(Native Method)
03-21 11:06:01.753: I/Process(2348): Sending signal. PID: 2348 SIG: 9

我在 Manifest 中也有这个 (ParseInitialization) 活动

Also I have this (ParseInitialization) activity in Manifest

 <activity
 android:name="ParseInitialization">
 </activity>

有什么建议吗?

推荐答案

ParseInitialization 是一个应用程序，而不是一个活动.如果您希望将其作为活动，请更改 java 代码.如果它是一个应用程序，那么您需要更改您的 androidManifest

ParseInitialization is a application, not an activity. If you want it as an activity please change the java code. If it is an Application then you need to change your androidManifest

申请声明样本:

 <application
        android:name="com.example.baharat2.ParseInitialization" >

....

</application>

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