How can solve this problem

See below my code

public class MainActivity extends AppCompatActivity {

private ImageView iconImage;
private LinearLayout linearLayout;
private Button register;
private Button login;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    iconImage = findViewById(R.id.icon_image);
    linearLayout = findViewById(R.id.linear_layout);
    register = findViewById(R.id.register);
    login = findViewById(R.id.login);

    linearLayout.animate().alpha(0f).setDuration(1);

    TranslateAnimation animation = new TranslateAnimation(0,0,0,-1000);
    animation.setDuration(1000);
    animation.setFillAfter(false);
    animation.setAnimationListener(new myAnimationListener());

     iconImage.setAnimation(animation);

     register.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View view) {
             new MainActivity(new Intent(MainActivity.this, RegisterActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP));  **Here saying that is create constructor**
         }
     });

     login.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View view) {
             new MainActivity(new Intent(MainActivity.this, LoginActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP));**Here saying that is create constructor**
         }
     });
}
private class myAnimationListener implements Animation.AnimationListener{
    @Override
    public void onAnimationStart(Animation animation) {
    }

    @Override
    public void onAnimationEnd(Animation animation) {
         iconImage.clearAnimation();
         iconImage.setVisibility(View.INVISIBLE);
         linearLayout.animate().alpha(1f).setDuration(1000);
    }

    @Override
    public void onAnimationRepeat(Animation animation) {

    }
}

}

if I will not use new operator before MainActivity(new Intent(MainActivity.this, LoginActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP)); it shows error is that Method call expected

Who's know answer of problem please answer as soon as possible

??

CodePudding user response：

Replace:

new MainActivity(new Intent(MainActivity.this, RegisterActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP));

with:

startActivity(new Intent(MainActivity.this, RegisterActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP));

(and similarly for the second new MainActivity() line)

Note that the use of startActivity() is covered in most books and introductory courses on Android app development. FWIW, here is a free book of mine, and here is the chapter in that book talking about multiple activities and startActivity().

CodePudding user response：

To start an activity, you need the startActivity() method which needs a intent as its param. But, what you do is that you are trying to open it using the class's constructor. This won't work. Try this:

startActivity(new Intent(MainActivity.this, RegisterActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP));

This code will replace

new MainActivity(new Intent(MainActivity.this, RegisterActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP));

Happy coding