Android:动态开始活动 [英] Android: Dynamically starting an activity

问题描述

我想根据前一个活动的输入动态地启动一个活动.我已经通过上一个活动输入了一个字符串，唯一的是此特定代码引发了错误

I would like to dynamically start an activity based on the previous activity's input. I have input a string through the previous activity, the only thing is this specific code throws the error

无法解析构造函数'Intent(com.MentalMathWorkout.EasyCountDown，java.lang.String)'

cannot resolve constructor 'Intent(com.MentalMathWorkout.EasyCountDown, java.lang.String)'

有没有办法使这项工作成功?

Is there a way to make this work?

public class EasyCountDown extends AppCompatActivity {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ecd);

    Intent intent = getIntent();
    String test = intent.getStringExtra(MainActivity.TEST_TYPE);
    String cstring = ".class";
    final String activity = test.concat(cstring);

    Intent intent = new Intent(EasyCountDown.this, activity);
    startActivity(intent); //Start test
}

推荐答案

ComponentName对象就是这样:

The ComponentName object does just that:

String activity = intent.getStringExtra(MainActivity.TEST_TYPE);
Intent intent = new Intent(this, new ComponentName(this, activity));
startActivity(intent);

假设 this 是 Activity 的一个实例.(对于 Fragment ，请使用 getActivity()，参见)

That's assuming this is an instance of Activity. (for a Fragment, use getActivity(), obv.)

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