棉花糖许可

获取此异常，而试图做出RecyclerView项目点击一个电话......棉花糖许可

FATAL EXCEPTION: main 
    Process: com.itec.kdaportal, PID: 11701 
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.PackageManager android.content.Context.getPackageManager()' on a null object reference 
    at android.content.ContextWrapper.getPackageManager(ContextWrapper.java:97) 
    at android.app.Activity.shouldShowRequestPermissionRationale(Activity.java:4229) 
    at android.support.v4.app.ActivityCompatApi23.shouldShowRequestPermissionRationale(ActivityCompatApi23.java:50) 
    at android.support.v4.app.ActivityCompat.shouldShowRequestPermissionRationale(ActivityCompat.java:419) 
    at com.itec.kdaportal.Adapters.DirCustomAdapter$ViewHolder$1.onClick(DirCustomAdapter.java:65) 
    at android.view.View.performClick(View.java:5716) 
    at android.view.View$PerformClick.run(View.java:22596) 
    at android.os.Handler.handleCallback(Handler.java:739) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:148) 
    at android.app.ActivityThread.main(ActivityThread.java:7331) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

这是造成这个excaption的代码，我认为，在这里...

// Provide a suitable constructor (depends on the kind of dataset) 
public DirCustomAdapter(Context context, Activity activity, ArrayList<Directories> dir) { 
    mContext = context; 
    mActivity = activity; 
    this.list = dir; 
} 

// Provide a reference to the views for each data item 
// Complex data items may need more than one view per item, and 
// you provide access to all the views for a data item in a view holder 
public static class ViewHolder extends RecyclerView.ViewHolder { 
    Directories dirObj; 
    // each data item is just a string in this case 
    public TextView org, contact; 
    private int PHONE_PERMISSION_CODE = 03; 

    public ViewHolder(View v) { 
     super(v); 
     org = (TextView) v.findViewById(R.id.tvOrganization); 
     contact = (TextView) v.findViewById(R.id.tvContactNo); 

     v.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Toast.makeText(mContext, dirObj.getOrgName() + " clicked!", Toast.LENGTH_SHORT).show(); 
       phoneNo = dirObj.getContactNo(); 
       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
        if(ActivityCompat.checkSelfPermission(mContext, Manifest.permission.CALL_PHONE) == PackageManager.PERMISSION_GRANTED){ 
         mContext.startActivity(new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + dirObj.getContactNo()))); 
        }else{ 
         if(ActivityCompat.shouldShowRequestPermissionRationale(mActivity, Manifest.permission.CALL_PHONE)){ 
          Toast.makeText(mContext, "App requires Phone Call permission.\nPlease allow that in the device settings.", Toast.LENGTH_LONG).show(); 
         } 
         ActivityCompat.requestPermissions(mActivity, new String[]{Manifest.permission.CALL_PHONE}, PHONE_PERMISSION_CODE); 
        } 
       }else{ 
        mContext.startActivity(new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + dirObj.getContactNo()))); 
       } 
      } 
     }); 
    } 
    public void bindData(Directories c){ 
     dirObj = c; 
     org.setText(c.getOrgName()); 
     contact.setText(c.getContactNo()); 
    } 
}

创建CustomAdapter对象这样...

dirAdapter = new DirCustomAdapter(this, new DirectoryActivity(), arrayList); 
    mRecyclerView.setAdapter(dirAdapter);

应用程序是在预Marshmallo做工精细w设备。

请帮我修复它。

另外建议请，有没有其他方式要求棉花糖权限点击RecyclerView项目点击？

感谢和问候

来源

2016-11-29 Zeero0

尝试这可能是工作stackoverflow.com/a/41221852/5488468 –

创建活动类的新对象是走错了路。

dirAdapter = new DirCustomAdapter(this, new DirectoryActivity(), arrayList); // HERE new DirectoryActivity() is incorrect way to pass Activity reference. 
mRecyclerView.setAdapter(dirAdapter);

使用下面的代码

dirAdapter = new DirCustomAdapter(this, DirectoryActivity.this, arrayList); 
mRecyclerView.setAdapter(dirAdapter);

我这里假设，您正在调用上面的代码片段从DirectoryActivity.javaActivity类。

来源

2016-11-29 06:42:42

是的，它的工作。我在想DirectoryActivity.this会通过上下文。非常感谢 – Zeero0

尽管您只能在这里使用Activity实例。无需传递Context和Activity。 –

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