java - 尝试启动 Activity 导致抛出异常，不确定原因

Question

这是代码:

public View getView(int position, View convertView, ViewGroup parent) {

    if (convertView == null) {
        convertView = new ExpenseIcon(context);

        ((ExpenseIcon) convertView)
                .setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        System.out.println("Expense Icon Clicked");

                        Intent a = new Intent(context, ExpenseInput.class);
                        a.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP & Intent.FLAG_ACTIVITY_NEW_TASK);
                        context.startActivity(a);
                    }
                });
    }

    if (image == null)
        image = BitmapFactory.decodeResource(context.getResources(), R.drawable.dollar);

    ((ExpenseIcon)convertView).setImageBitmap(image);

    return convertView;
}

当我单击 ExpenseIcon 按钮时，context.startActivity(a) 行抛出异常:

04-28 11:04:53.100: D/AndroidRuntime(24962): Shutting down VM 04-28 11:04:53.100: W/dalvikvm(24962): threadid=1: thread exiting with uncaught exception (group=0x41ebc930) 04-28 11:04:53.130: E/AndroidRuntime(24962): FATAL EXCEPTION: main 04-28 11:04:53.130: E/AndroidRuntime(24962): android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want? 04-28 11:04:53.130: E/AndroidRuntime(24962): at android.app.ContextImpl.startActivity(ContextImpl.java:944) 04-28 11:04:53.130: E/AndroidRuntime(24962): at android.app.ContextImpl.startActivity(ContextImpl.java:931) 04-28 11:04:53.130: E/AndroidRuntime(24962): at android.content.ContextWrapper.startActivity(ContextWrapper.java:284) 04-28 11:04:53.130: E/AndroidRuntime(24962): at com.example.mytestapp.controls.ExpenseIconGridGenerate$1.onClick(ExpenseIconGridGenerate.java:63) 04-28 11:04:53.130: E/AndroidRuntime(24962): at android.view.View.performClick(View.java:4204) 04-28 11:04:53.130: E/AndroidRuntime(24962): at android.view.View$PerformClick.run(View.java:17355) 04-28 11:04:53.130: E/AndroidRuntime(24962): at android.os.Handler.handleCallback(Handler.java:725) 04-28 11:04:53.130: E/AndroidRuntime(24962): at android.os.Handler.dispatchMessage(Handler.java:92) 04-28 11:04:53.130: E/AndroidRuntime(24962): at android.os.Looper.loop(Looper.java:137) 04-28 11:04:53.130: E/AndroidRuntime(24962): at android.app.ActivityThread.main(ActivityThread.java:5041) 04-28 11:04:53.130: E/AndroidRuntime(24962): at java.lang.reflect.Method.invokeNative(Native Method) 04-28 11:04:53.130: E/AndroidRuntime(24962): at java.lang.reflect.Method.invoke(Method.java:511) 04-28 11:04:53.130: E/AndroidRuntime(24962): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 04-28 11:04:53.130: E/AndroidRuntime(24962): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 04-28 11:04:53.130: E/AndroidRuntime(24962): at dalvik.system.NativeStart.main(Native Method)

我不确定为什么，也不知道如何解决......

Answer 1

试试这个，

Intent a = new Intent(context, ExpenseInput.class);
a.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(a);