Question

我尝试通过点击图片按钮从主要活动开始新活动但我收到此错误：

android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?

这是我的代码：

public void WordsButton() {

   words = (ImageButton) findViewById(R.id.words);

   words.setOnClickListener(new View.OnClickListener() {

       @Override
       public void onClick(View arg0) {
           Intent intent = new Intent(getApplicationContext(), WordsActivity.class);
           getApplicationContext.startActivity(intent);
       }

   });
}

Answer 1

尝试将onClick方法参数从arg0更改为v，使其与接口中的方法定义相同

这是一个建议

words.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getApplicationContext(), WordsActivity.class);
            startActivity(intent);
        }
    });

Answer 2

将您的getApplicationContext.startActivity(intent);更改为startActivity(intent)

Answer 3

请勿使用getApplicationContext()

只需使用标准的活动上下文getContext()

即可

Answer 4

你应该用这个：

words.setOnClickListener(new View.OnClickListener() {

       @Override
       public void onClick(View arg0) {
           Intent intent = new Intent(MainActivity.this, WordsActivity.class);
           startActivity(intent);
       }

   });

Answer 5

使用此：

public void WordsButton() {

       words = (ImageButton) findViewById(R.id.words);

       words.setOnClickListener(new View.OnClickListener() {

           @Override
           public void onClick(View arg0) {
               Intent intent = new Intent(getApplicationContext(), WordsActivity.class);
               startActivity(intent);
           }

       });
    }

Answer 6

将此标记添加到您的意图

MyApp

使用标准上下文getContext（）

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(tapGestureAction(_:)))
        view.addGestureRecognizer(tapGesture)
    }

    func tapGestureAction(_ tapGesture: UITapGestureRecognizer) {
        let tappedLocationPoint = tapGesture.location(in: view)
        print(tappedLocationPoint.x)
        print(tappedLocationPoint.y)

        // determining which area has been tapped based on what's the value of x and y

        // you logic goes here...
        // ...
    }
}

无法召集新活动

6 个答案: