Activity的生命周期

  1 package com.example.zhouy.android4exercise;
  2 
  3 import android.app.Activity;
  4 import android.content.DialogInterface;
  5 import android.content.Intent;
  6 import android.os.Bundle;
  7 import android.os.PersistableBundle;
  8 import android.support.v7.app.AlertDialog;
  9 import android.util.Log;
 10 import android.view.View;
 11 import android.widget.Button;
 12 
 13 public class MainActivity extends Activity implements View.OnClickListener{
 14 
 15     private Button mAlertBtn = null;
 16 
 17     private Button mJumpBtn = null;
 18 
 19     @Override
 20     protected void onCreate(Bundle savedInstanceState) {
 21         super.onCreate(savedInstanceState);
 22         setContentView(R.layout.activity_main);
 23         mAlertBtn = (Button)findViewById(R.id.alert_dialog);
 24         mAlertBtn.setOnClickListener(this);
 25         mJumpBtn = (Button)findViewById(R.id.jump_to_another_activity);
 26         mJumpBtn.setOnClickListener(this);
 27         Log.v("Tag","onCreate()");
 28     }
 29 
 30     private void alertDialog(){
 31         //利用Activity进行弹出对话框时，Activity的生命周期不会改变。
 32         final AlertDialog.Builder builder = new AlertDialog.Builder(this);
 33         builder.setTitle("对话框标题");
 34         builder.setMessage("对话框内容");
 35         builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
 36             @Override
 37             public void onClick(DialogInterface dialogInterface, int i) {
 38                 Log.v("Tag","Ok");
 39             }
 40         });
 41         builder.setNegativeButton("Cancle", new DialogInterface.OnClickListener() {
 42             @Override
 43             public void onClick(DialogInterface dialogInterface, int i) {
 44                 Log.v("Tag","Cancel");
 45             }
 46         });
 47         builder.create();
 48         builder.show();
 49 
 50     }
 51 
 52     private void gotoNextActivity(){
 53         Intent intent = new Intent(this,NextActivity.class);
 54         startActivity(intent);
 55     }
 56     @Override
 57     protected void onRestart() {
 58         super.onRestart();
 59         Log.v("Tag","onReStart()");
 60     }
 61 
 62     @Override
 63     protected void onRestoreInstanceState(Bundle savedInstanceState) {
 64         super.onRestoreInstanceState(savedInstanceState);
 65         Log.v("Tag","onRestoreInstanceState");
 66     }
 67 
 68     @Override
 69     protected void onStart() {
 70         super.onStart();
 71         Log.v("Tag","onStart()");
 72 
 73     }
 74 
 75     @Override
 76     protected void onResume() {
 77         super.onResume();
 78         Log.v("Tag","onResume()");
 79 
 80     }
 81 
 82 
 83     @Override
 84     protected void onPause() {
 85         super.onPause();
 86         Log.v("Tag","onPause()");
 87 
 88     }
 89 
 90     @Override
 91     public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
 92         super.onSaveInstanceState(outState, outPersistentState);
 93         Log.v("Tag","onSaveInstanceState");
 94     }
 95 
 96     @Override
 97     protected void onStop() {
 98         super.onStop();
 99         Log.v("Tag","onStop()");
100 
101     }
102 
103     @Override
104     protected void onDestroy() {
105         super.onDestroy();
106         Log.v("Tag","onDestory()");
107 
108     }
109 
110     @Override
111     public void onClick(View view) {
112         int id =  view.getId();
113         if(id == R.id.alert_dialog){
114             alertDialog();
115         }else if(id == R.id.jump_to_another_activity){
116             gotoNextActivity();
117         }
118     }
119 }
120 

4.activity_main.xml

1 <?xml version="1.0" encoding="utf-8"?>
2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
3     xmlns:tools="http://schemas.android.com/tools"
4     android:layout_width="match_parent"
5     android:layout_height="match_parent"
6     android:paddingBottom="@dimen/activity_vertical_margin"
7     android:paddingLeft="@dimen/activity_horizontal_margin"
8     android:paddingRight="@dimen/activity_horizontal_margin"
9     android:paddingTop="@dimen/activity_vertical_margin"

10     tools:context="com.example.zhouy.android4exercise.MainActivity">
 11     <Button
 12         android:id="@+id/alert_dialog"
 13         android:layout_alignParentTop="true"
 14         android:layout_width="match_parent"
 15         android:layout_height="wrap_content"
 16         android:text="弹出对话框"/>
 17     <Button
 18         android:id="@+id/jump_to_another_activity"
 19         android:layout_below="@id/alert_dialog"
 20         android:layout_width="match_parent"
 21         android:layout_height="wrap_content"
 22         android:text="跳转到另一个Activity"/>
 23 
 24 </RelativeLayout>