1.安卓基础之Activity生命周期

1.ActivityLifeCycle:测试生命周期的Activity 2.CommonActivity是一个普通的Activity 3.DialogActivity是对话框型的Activity

一、Activity

1.ActivityLifeCycle.java

public class ActivityLifeCycle extends AppCompatActivity { private static final String TAG = "ActivityLifeCycle"; @BindView(R.id.btn_task_activity) Button mBtnTaskActivity; @BindView(R.id.btn_dialog_activity) Button mBtnDialogActivity; @Override//Activity第一次创建时调用 protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.ac_lifecycle); ButterKnife.bind(this); Log.e(TAG, "onCreate: "); Log.e("TASK_ID", "Task id is " + getTaskId()); } @Override//Activity可见的时候调用 protected void onStart() { super.onStart(); Log.e(TAG, "onStart: "); } @Override//Activity位于栈顶，获取焦点时调用 protected void onResume() { super.onResume(); Log.e(TAG, "onResume: "); } @Override//Activity移除栈顶，失去焦点时调用 protected void onPause() { super.onPause(); Log.e(TAG, "onPause: "); } @Override//由停止状态变为运行状态之前调用 protected void onRestart() { super.onRestart(); Log.e(TAG, "onRestart: "); } @Override//Activity不可见的时候调用 protected void onStop() { super.onStop(); Log.e(TAG, "onStop: "); } @Override//Activity销毁的时候调用 protected void onDestroy() { super.onDestroy(); Log.e(TAG, "onDestroy: "); } @OnClick({R.id.btn_task_activity, R.id.btn_dialog_activity}) public void onViewClicked(View view) { switch (view.getId()) { case R.id.btn_task_activity: //跳转到TaskActivity startActivity(new Intent(this, TaskActivity.class)); break; case R.id.btn_dialog_activity: //跳转到DialogActivity startActivity(new Intent(this, DialogActivity.class)); break; } } }

2.CommonActivity.java

public class CommonActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.ac_task); ButterKnife.bind(this); } }

3.DialogActivity

public class DialogActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.ac_dialog); } }

二、生命周期测试结果：

1.打开：onCreate==>onStart==>onResume

E/ActivityLifeCycle: onCreate: E/ActivityLifeCycle: onStart: E/ActivityLifeCycle: onResume:

2.跳转普通Activity：onPause==>onStop

E/ActivityLifeCycle: onPause: E/ActivityLifeCycle: onStop:

3.从跳转的Activity返回：onRestart==>onStart==>onResume

E/ActivityLifeCycle: onRestart: E/ActivityLifeCycle: onStart: E/ActivityLifeCycle: onResume:

4.跳转到对话框Activity：onPause

E/ActivityLifeCycle: onPause:

5.从对话框Activity返回：onResume

E/ActivityLifeCycle: onResume:

6.旋转屏幕(相当于关闭再开启)：onPause==>onStop==>onDestroy==>onCreate==>onStart==>onResume

E/ActivityLifeCycle: onPause: E/ActivityLifeCycle: onStop: E/ActivityLifeCycle: onDestroy: E/ActivityLifeCycle: onCreate: E/ActivityLifeCycle: onStart: E/ActivityLifeCycle: onResume:

7.关闭：onPause==>onStop==>onDestroy

E/ActivityLifeCycle: onPause: E/ActivityLifeCycle: onStop: E/ActivityLifeCycle: onDestroy:

---

附录、布局：

1.ActivityLifeCycle布局：ac_lifecycle.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/btn_task_activity" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="16dp" android:text="打开TaskActivity" android:textAllCaps="false" app:layout_constraintTop_toTopOf="parent" tools:layout_editor_absoluteX="30dp"/> <Button android:id="@+id/btn_dialog_activity" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="16dp" android:text="打开DialogActivity" android:textAllCaps="false" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.873" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent"/> </android.support.constraint.ConstraintLayout>

2.CommonActivity布局：ac_task.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/btn_start_self" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="16dp" android:text="打开自己" android:textAllCaps="false" app:layout_constraintTop_toTopOf="parent" tools:layout_editor_absoluteX="30dp"/> <Button android:id="@+id/button_start_others" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="8dp" android:layout_marginStart="8dp" android:layout_marginTop="16dp" android:text="打开别人" app:layout_constraintStart_toEndOf="@+id/btn_start_self" app:layout_constraintTop_toTopOf="parent"/> </android.support.constraint.ConstraintLayout>

3.DialogActivity布局：ac_dialog.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="A01_DialogActivity" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" tools:layout_editor_absoluteY="233dp" tools:ignore="MissingConstraints"/> </android.support.constraint.ConstraintLayout>

4.DialogActivity对话框主题

<activity android:name=".DialogActivity" android:label="DialogActivity" android:theme="@style/Theme.AppCompat.Light.Dialog"> </activity>

本文由张风捷特烈原创,转载请注明 更多安卓技术欢迎访问：https://www.jianshu.com/c/004f3fe34c94 张风捷特烈个人网站，编程笔记请访问：http://www.toly1994.com 你的喜欢与支持将是我最大的动力

转载于:https://www.cnblogs.com/toly-top/p/9781917.html