Android——Activity生命週期

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啟動:    觸發 onCreate()   onStart()   onResume()

Home鍵:   觸發 onPause()    onStop()

back鍵退出: 觸發 onPause()   onStop()   onDestroy()

Home鍵退出再進去: 觸發 onRestart()   onStart()  onResume()

 

啟動:

Home鍵:

再次進入:

退出:

 

Source:

package com.TreeDream.life;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.widget.TextView;public class MainActivity extends Activity {    private TextView textView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        System.out.println("onCreate");                textView = (TextView)findViewById(R.id.textView1);        textView.setText("onCreate");            }            @Override    protected void onStart() {        super.onStart();        System.out.println("onStart");            }    @Override    protected void onResume() {        super.onResume();        System.out.println("onResume");    }        @Override    protected void onPause() {        super.onPause();        System.out.println("onPause");    }        @Override    protected void onStop() {        super.onStop();        System.out.println("onStop");    }        @Override    protected void onDestroy() {        super.onDestroy();        System.out.println("onDestroy");    }        @Override    protected void onRestart() {        super.onRestart();        System.out.println("onRestart");        textView = (TextView)findViewById(R.id.textView1);        textView.setText("onReStart");    }        }
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/Tree" />    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/textView2"        android:layout_below="@+id/textView2"        android:layout_marginTop="40dp"        android:text="" />    <TextView        android:id="@+id/textView3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/textView1"        android:layout_below="@+id/textView1"        android:layout_marginTop="20dp"        android:text="生活賦予我們一種巨大的和無限高貴的禮品,這就是青春:充滿著力量,充滿著期待志願,充滿著求知和鬥爭的志向,充滿著希望信心和青春。" />    <ImageView        android:id="@+id/imageView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"        android:layout_marginBottom="44dp"        android:src="@drawable/x" /></RelativeLayout>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">Life</string>    <string name="action_settings">Settings</string>    <string name="hello_world">Hello world!</string>    <string name="Tree">TreeDream Android</string></resources>
string.xml

 

Android——Activity生命週期

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