Activity创建过程：
1.建立Activity类及定义属性及内部方法；
2.注册Activity到manifast中；
3.在启动中使用onCreat()实现业务：
（1）界面定义
（2）setContentView()加载页面；
//将layout压缩成ViewView view=this.getLayoutInflater().inflate(R.layout.activity_activity_demo, null); |
Intent:
Intent有两种：Explicit intents(明确的意图)；Implicit intents (含蓄的意图)
Explicit intents:通过组件名启动
Implicit intents：通过匹配manifest file中的Intent filter来启动组件，若匹配结果仅有一项，直接启动；若多项匹配，根据弹出的dialog进行选择
Intent属性：
1.Component：启动Explicit intents必不缺少的
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18 |
//显示启动Intent,必须指定Intent属性Component，Component属性需要指定ComponentName//1.直接创建时指定Intent intent=new
Intent(ActivityDemoActivity.this, ActivityIntentDemo.class);Intent intent=new
Intent();//2.通过ComponentName构造器来指定;只须指定包名与类名就可以唯一确定组件名ComponentName componentName=new
ComponentName("androidstudy.ActivityDemo","androidstudy.ActivityDemo.ActivityIntentDemo");ComponentName componentName=new
ComponentName(ActivityDemoActivity.this,ActivityIntentDemo.class);ComponentName componentName=new
ComponentName(ActivityDemoActivity.this,"androidstudy.ActivityDemo.ActivityIntentDemo");intent.setComponent(componentName);//3.setClass()与setClassName()指定intent.setClass(ActivityDemoActivity.this, ActivityIntentDemo.class);intent.setClassName(ActivityDemoActivity.this, "androidstudy.ActivityDemo.ActivityIntentDemo");intent.setClassName("androidstudy.ActivityDemo","androidstudy.ActivityDemo.ActivityIntentDemo");startActivity(intent); |
返回Intent传递参数是否成功
调用startActivityForResult(intent, 1234);
intent是传递的Intent,1234为RequestResult,成功后回调函数protected void onActivityResult(int requestCode, int resultCode, Intent data) ；
在新的Activity 中通过调用函数setResult(5678,mIntent);设置回调的resultCode与Intent
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40 |
//调用Intent的Activitypublic
void
demo(View view){ //显示启动Intent,必须指定Intent属性Component，Component属性需要指定ComponentName //1.直接创建时指定 //Intent intent=new Intent(ActivityDemoActivity.this, ActivityIntentDemo.class); intent=new
Intent(); //2.通过ComponentName构造器来指定;只须指定包名与类名就可以唯一确定组件名 //ComponentName componentName=new ComponentName("androidstudy.ActivityDemo","androidstudy.ActivityDemo.ActivityIntentDemo"); //ComponentName componentName=new ComponentName(ActivityDemoActivity.this,ActivityIntentDemo.class); //ComponentName componentName=new ComponentName(ActivityDemoActivity.this,"androidstudy.ActivityDemo.ActivityIntentDemo"); //intent.setComponent(componentName); //3.setClass()与setClassName()指定 intent.setClass(ActivityDemoActivity.this, ActivityIntentDemo.class); //intent.setClassName(ActivityDemoActivity.this, "androidstudy.ActivityDemo.ActivityIntentDemo"); //intent.setClassName("androidstudy.ActivityDemo","androidstudy.ActivityDemo.ActivityIntentDemo"); intent.putExtra("STUDY", "hello 阳光 "); startActivityForResult(intent, 1234); } protected
void
onActivityResult(int
requestCode, int
resultCode, Intent data) { if(resultCode==5678){ Toast.makeText(ActivityDemoActivity.this, data.getExtras().getString("STUDY"), Toast.LENGTH_LONG).show(); System.out.println(intent.getStringExtra("STUDY")); } super.onActivityResult(requestCode, resultCode, data); };//接收Intent的Activitypublic
void
click(View view){ mIntent.putExtra("STUDY", "hello moon"); //设置返回值 setResult(5678,mIntent); //关闭此Activity finish(); } |
原文：http://www.cnblogs.com/Eudora/p/3513663.html