1.安卓基础之Activity生命周期

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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>

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