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);
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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
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//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
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//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();
}
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