Android第一天Intent

Intent知识点和Activity生命周期

1、Intent可以可以实现页面和页面之间的切换,在Android中每一个Activity都对于一个(或他们与之相关的子类)它们的之类

eg:  Intent intent = new Intent(this.MainActivity, SignInActivity.class);

   startActivity(intent);

2、Intent 还可以实现发邮件，带电话，发短信

   Intent intent = new Intent(Intent.ACTION_SEND);
   intent.putExtra(Intent.EXTRA_EMAIL, recipientArray);
   startActivity(intent);
Activity生命周期

public class ExampleActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }
    @Override
    protected void onStart() {
        super.onStart();
        // The activity is about to become visible.
    }
    @Override
    protected void onResume() {
        super.onResume();
    }
    @Override
    protected void onPause() {
        super.onPause();
    }
    @Override
    protected void onStop() {
        super.onStop();
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
    }
}