java - 如何在适配器类中传递 Intent

Question

我正在尝试使用 Intent 从一个 Activity 导航到另一个 Activity ，但是当调用 onclick 方法时我的应用程序崩溃，给出空指针异常，这里是我的适配器类的代码。

@Override
public void onBindViewHolder(absadapter.exViewHolder holder, final int position){
    holder.exname.setText(exList.get(position).name);
    holder.exlogo.setImageResource(exList.get(position).logoId);
    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (position == 0) {
                Intent intent=new Intent(context,crunches.class);
                context.startActivity(intent);
            }
        }
    });


}

这是 logcat 错误:

FATAL EXCEPTION: main
              Process: com.example.ruchit.totalfitness, PID: 1481
              java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
                  at android.content.ComponentName.<init>(ComponentName.java:130)
                  at android.content.Intent.<init>(Intent.java:5787)
                  at com.example.ruchit.totalfitness.absadapter$1.onClick(absadapter.java:60)
                  at android.view.View.performClick(View.java:6312)
                  at android.view.View$PerformClick.run(View.java:24811)
                  at android.os.Handler.handleCallback(Handler.java:790)
                  at android.os.Handler.dispatchMessage(Handler.java:99)
                  at android.os.Looper.loop(Looper.java:171)
                  at android.app.ActivityThread.main(ActivityThread.java:6649)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)

Answer 1

改变这个

 Intent intent=new Intent(context,crunches.class);
            context.startActivity(intent);

至

v.getContext().startActivity(new Intent(v.getContext(), crunches.class));

希望对您有帮助!