Android 组建-Activity介绍

packagecom.example.emo;
importandroidx.annotation.Nullable;
importandroidx.appcompat.app.AppCompatActivity;
importandroid.graphics.Color;
importandroid.os.Bundle;
importandroid.os.PersistableBundle;
importandroid.util.Log;
importandroid.view.MotionEvent;
importandroid.view.View;
importandroid.widget.EditText;
importandroid.widget.TextView;
publicclassMainActivityextendsAppCompatActivity {
Stringmsg="activity_demo";
@OverrideprotectedvoidonCreate(BundlesavedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(msg, "The onCreate() event");
TextViewview=findViewById(R.id.main_text);
view.setText("你好");
Viewbutton=findViewById(R.id.button);
button.setOnClickListener(
newView.OnClickListener() {
@OverridepublicvoidonClick(Viewview) {
Log.d("button", "i am clicked");
                }
            }
        );
button.setOnTouchListener(newView.OnTouchListener() {
@OverridepublicbooleanonTouch(Viewview, MotionEventmotionEvent) {
Log.d("button", "i am touched");
returnfalse;
            }
        });
Viewbutton_enter=findViewById(R.id.button_enter);
button_enter.setOnClickListener(newView.OnClickListener() {
@OverridepublicvoidonClick(Viewview) {
EditTexteditText=findViewById(R.id.input);
Log.d("edit", editText.getText().toString());
            }
        });
    }
@OverrideprotectedvoidonStart() {
super.onStart();
Log.d(msg, "The onStart() event");
    }
@OverrideprotectedvoidonStop() {
super.onStop();
Log.d(msg, "The onStop() event");
    }
@OverrideprotectedvoidonDestroy() {
super.onDestroy();
Log.d(msg, "The onDestroy() event");
    }
@OverrideprotectedvoidonPause() {
super.onPause();
Log.d(msg, "The onPause() event");
    }
@OverrideprotectedvoidonResume() {
super.onResume();
Log.d(msg, "The onResume() event");
    }
@OverrideprotectedvoidonRestart() {
super.onRestart();
Log.d(msg, "The onRestart() event");
    }
}

TheonCreate() eventTheonStart() eventTheonResume() eventTheonPause() eventTheonStop() eventTheonRestart() eventTheonStart() eventTheonResume() eventTheonPause() eventTheonStop() event