Intent图片

选择器：其作用是显示一个Activity选择器
http://deep-fish.iteye.com/blog/2054119
Intent.ACTION_CHOOSER = “android.intent.action.CHOOSER”

//分享
Intent intent = new Intent();  
intent.setAction(Intent.ACTION_SEND);  
intent.setType("text/plain");  
Intent intent2 = new Intent();  
intent2.setAction(Intent.ACTION_CHOOSER);  
intent2.putExtra(Intent.EXTRA_TITLE, "please selete a app");  
intent2.putExtra(Intent.EXTRA_INTENT, intent);  
startActivity(intent2);  

也可以createChooser方法。

通讯录

Intent intent = new Intent(Intent.ACTION_PICK, People.CONTENT_URI); 
startActivityForResult(intent, PICK_CONTACT); 

音频

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);   
intent.setType("audio/*");   
startActivity(Intent.createChooser(intent, "Select music"));  

文件
MIME type类型选用（文件 图片） 类型选择（弃用deprecated）

Intent myIntent = new Intent(Intent.ACTION_PICK);
myIntent.setType("image/*");
startActivityForResult(i, 100);

图片获取url 可得到数据create the data as it runs

Intent myIntent = new Intent(Intent.ACTION_GET_CONTENT, null);
myIntent.setType("image/*");
startActivityForResult(i, 100);

http://blog.youkuaiyun.com/chenzheng_java/article/details/6266135
Intent.ACTION_PICK Android.intent.action.PICK 从列表中选择某项并返回所选数据

ACTION_GET_CONTENT Android.intent.action.GET_CONTENT 让用户选择数据，并返回所选数据

拍照
http://blog.youkuaiyun.com/csqingchen/article/details/45502813
MediaStore.ACTION_IMAGE_CAPTURE

裁剪
http://blog.youkuaiyun.com/eclothy/article/details/42719217
com.android.camera.action.crop

注意添加权限