Android Activity 和 Intent 机制学习笔记

核心提示：对于数据的获取可以采用：Bundle bundle=getIntent().getExtras(); String name=bundle.getString("name");3.向上一个Activity返回结果(使用setResult，针对 startActivityForResult(it,RE

对于数据的获取可以采用：

Bundle bundle=getIntent().getExtras(); String name=bundle.getString("name");

3.向上一个Activity返回结果(使用setResult，针对 startActivityForResult(it,REQUEST_CODE)启动的Activity)

Intent intent=getIntent(); Bundle bundle2=new Bundle(); bundle2.putString("name", "This is from ShowMsg!"); intent.putExtras(bundle2); setResult(RESULT_OK, intent);

4.回调上一个Activity的结果处理函数(onActivityResult)

@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); if (requestCode==REQUEST_CODE){ if(resultCode==RESULT_CANCELED) setTitle("cancle"); else if (resultCode==RESULT_OK) { String temp=null; Bundle bundle=data.getExtras(); if(bundle!=null) temp=bundle.getString("name"); setTitle(temp); } } }

下面是转载来的其他的一些Intent用法实例(转自javaeye)

显示网页

1. Uri uri = Uri.parse("http://google.com");

2. Intent it = new Intent(Intent.ACTION_VIEW, uri);

3. startActivity(it);

显示地图

1. Uri uri = Uri.parse("geo:38.899533,-77.036476");

2. Intent it = new Intent(Intent.ACTION_VIEW, uri);

3. startActivity(it);

4. //其他 geo URI ?例

5. //geo:latitude,longitude

6. //geo:latitude,longitude?z=zoom

7. //geo:0,0?q=my+street+address

8. //geo:0,0?q=business+near+city

9. //google.streetview:cbll=lat,lng&cbp=1,yaw,,pitch,zoom&mz=mapZoom

路径规划

1. Uri uri = Uri.parse("http://maps.google.com/maps?f=d&saddr=startLat%20startLng&daddr=endLat%20endLng&hl=en");

2. Intent it = new Intent(Intent.ACTION_VIEW, uri);

3. startActivity(it);

4. //where startLat, startLng, endLat, endLng are a long with 6 decimals like: 50.123456