从一个Activity跳转到另一个Acitivty必然要经历的生命周期有哪几个

最新推荐文章于 2024-11-15 16:26:40 发布

原创最新推荐文章于 2024-11-15 16:26:40 发布 · 175 阅读

0 ·

CC 4.0 BY-SA版权

常见面试题专栏收录该内容

12 篇文章

订阅专栏

本文通过两个具体的Android Activity示例（Activity_A 和 Activity_B），详细解析了Android应用中Activity的生命周期，包括onCreate、onStart、onResume、onPause、onStop、onDestroy以及onRestart等方法的调用时机及顺序，特别关注于Activity状态转换时的方法调用流程。

Activity_A代码：
public class Activity_A extends Activity {
private Button button;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
System.out.println("A------------onCreate");
button = (Button) findViewById(R.id.bt);
button.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(Activity_A.this, Activity_B.class);
startActivity(i);
}

});
}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
System.out.println("A------------onDestroy");
}

@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
System.out.println("A------------onPause");
}

@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
System.out.println("A------------onRestart");
}

@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
System.out.println("A------------onResume");
}

@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
System.out.println("A------------onStart");
}

@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
System.out.println("A------------onStop");
}

}

Activity_B:
public class Activity_B extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
System.out.println("B------------onCreate");
}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
System.out.println("B------------onDestroy");
}

@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
System.out.println("B------------onPause");
}

@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
System.out.println("B------------onRestart");
}

@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
System.out.println("B------------onResume");
}

@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
System.out.println("B------------onStart");
}

@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
System.out.println("B------------onStop");
}

}
当按下跳转按钮：
A:onpause();
B:onCreate();
B:onStart();
B:onResume();
A:onStop();