• Activity生命周期


    我的AndroidManifest.xml配置的版本是这样:(因为看其他帖子说不通的版本生命周期不一样

    1     <uses-sdk
    2             android:minSdkVersion="14"
    3             android:targetSdkVersion="19" />
    AndroidManifest

    第一个Activity的代码:

     1     package com.example.androidgov;
     2 
     3     import android.app.Activity;
     4     import android.app.AlertDialog;
     5     import android.content.DialogInterface;
     6     import android.content.DialogInterface.OnClickListener;
     7     import android.content.Intent;
     8     import android.content.res.Configuration;
     9     import android.os.Bundle;
    10     import android.view.View;
    11 
    12     public class TestActivityLifeF extends Activity {
    13 
    14         @Override
    15         protected void onCreate(Bundle savedInstanceState) {
    16             System.out.println("onCreate");
    17             super.onCreate(savedInstanceState);
    18             setContentView(R.layout.activity_test_activity_life_f);
    19         }
    20 
    21         public void startTest(View view) {
    22             Intent intent = new Intent(TestActivityLifeF.this,
    23                     StandardActivity.class);
    24             startActivity(intent);
    25         }
    26 
    27         public void startDialog(View view) {
    28             new AlertDialog.Builder(TestActivityLifeF.this).setTitle("Test")
    29                     .setMessage("just test dialog").setPositiveButton("确定", new OnClickListener() {
    30                         
    31                         @Override
    32                         public void onClick(DialogInterface dialog, int which) {
    33                             
    34                         }
    35                     }).create().show();
    36         }
    37 
    38         @Override
    39         protected void onStart() {
    40             System.out.println("onStart");
    41             super.onStart();
    42         }
    43 
    44         @Override
    45         protected void onResume() {
    46             System.out.println("onResume");
    47             super.onResume();
    48         }
    49 
    50         @Override
    51         protected void onPause() {
    52             System.out.println("onPause");
    53             super.onPause();
    54         }
    55 
    56         @Override
    57         protected void onStop() {
    58             System.out.println("onStop");
    59             super.onStop();
    60         }
    61 
    62         @Override
    63         protected void onDestroy() {
    64             System.out.println("onDestroy");
    65             super.onDestroy();
    66         }
    67 
    68         @Override
    69         protected void onRestart() {
    70             System.out.println("onRestart");
    71             super.onRestart();
    72         }
    73 
    74         @Override
    75         protected void onSaveInstanceState(Bundle outState) {
    76             System.out.println("onSaveInstanceState");
    77             super.onSaveInstanceState(outState);
    78         }
    79 
    80         @Override
    81         protected void onRestoreInstanceState(Bundle savedInstanceState) {
    82             System.out.println("onRestoreInstanceState");
    83             super.onRestoreInstanceState(savedInstanceState);
    84         }
    85 
    86         @Override
    87         public void onConfigurationChanged(Configuration newConfig) {
    88             System.out.println("onConfigurationChanged");
    89             super.onConfigurationChanged(newConfig);
    90         }
    91     }
    TestActivityLifeF

    相应布局文件:

     1     <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     2         xmlns:tools="http://schemas.android.com/tools"
     3         android:id="@+id/container"
     4         android:layout_width="match_parent"
     5         android:layout_height="match_parent"
     6         android:orientation="vertical"
     7         tools:context="com.example.androidgov.TestActivityLifeF"
     8         tools:ignore="MergeRootFrame" >
     9 
    10         <Button
    11             android:layout_width="match_parent"
    12             android:layout_height="wrap_content"
    13             android:onClick="startTest"
    14             android:text="启动Activity" />
    15 
    16         <Button
    17             android:layout_width="match_parent"
    18             android:layout_height="wrap_content"
    19             android:onClick="startDialog"
    20             android:text="启动对话框" />
    21 
    22     </LinearLayout>
    activity_test_activity_life_f

    第二个Activity的代码:

     1     package com.example.androidgov;
     2 
     3     import android.app.Activity;
     4     import android.os.Bundle;
     5 
     6     public class StandardActivity extends Activity {
     7 
     8         @Override
     9         protected void onCreate(Bundle savedInstanceState) {
    10             super.onCreate(savedInstanceState);
    11             setContentView(R.layout.activity_standard);
    12         }
    13 
    14         
    15     }
    StandardActivity

    布局文件很简单,用默认生成的布局

    启动第一个Activity:

    切换到横屏:

    看网上的帖子说横屏再切换成竖屏,生命周期的方法会调用两次,但我自己测试只调用了一次,如下(横屏切换回竖屏):

    启动其他Activity:

    从其他Activity中返回:

    启动对话框和关闭对话框均不调用上面代码中列出的这些方法
    最后退出Activity:

    最后做个总结:
    仅分析Activity中的10个方法:
    onCreate()/onStart()/onResume()/onPause()/onStop()/onDestroy()/onRestart()/onSaveInstanceState()/onRestoreInstanceState()/onConfigurationChanged()
    1:启动Activity:
    onCreate()->onStart()->onResume()
    2:竖屏切换横屏:
    onPause()->onSaveInstanceState()->onStop()->onDestory()->onCreate()->onStart()->onRestoreInstanceState()->onResume()
    3:横屏再切换回竖屏(和竖屏切换横屏一样)
    onPause()->onSaveInstanceState()->onStop()->onDestory()->onCreate()->onStart()->onRestoreInstanceState()->onResume()
    4:启动其他Activity:
    onPause()->onSaveInstanceState()->onStop();
    5:从其他Activity中返回:
    onRestart()->onStart()->onResume()
    6:启动对话框、关闭对话框,不调用上面列出的10个方法中任何一个
    7:退出Activity:
    onPause()->onStop()->onDestory()

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  • 原文地址:https://www.cnblogs.com/creasylai19/p/3771541.html
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