Intent的用法（3）:Intent的setType()以及相关setData()和setDataAndType()

悠悠 2023-06-21 14:24 46阅读 0赞

intent.setType()...

#### Type(数据类型) ####

**显示的指定Intent的数据类型，而跳过了通过Uri进行推导判断的步骤。  
如：Vedio、Image、Voice等。**

intent.setType(“image/*”);
    
    //intent.setType(“audio/*”); //选择音频
    
    //intent.setType(“video/*”); //选择视频 （mp4 3gp 是android支持的视频格式）

例如，我要实现获取手机相册功能可用如下代码：

Intent intent = new Intent(Intent.ACTION_PICK);//intent  action属性
    intent.setType("image/*");//选择图片
    startActivityForResult(intent, PHOTO_REQUEST_GALLERY);

**但是setType只支持单个setType**

正确的做法(比如我要限制只查看ppt ,doc,docx,pptx,pdf等文件)如下：

public static final String DOC = "application/msword";
        public static final String DOCX = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
        public static final String XLS = "application/vnd.ms-excel application/x-excel";
        public static final String XLSX = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        public static final String PPT = "application/vnd.ms-powerpoint";
        public static final String PPTX = "application/vnd.openxmlformats-officedocument.presentationml.presentation";
        public static final String PDF = "application/pdf";
      
    try {
         Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
         intent.addCategory(Intent.CATEGORY_OPENABLE);
         //设置doc,docx,ppt,pptx,pdf 5种类型
         intent.setType("application/msword|application/vnd.openxmlformats-officedocument.wordprocessingml.document" +
              "|application/vnd.ms-powerpoint|application/vnd.openxmlformats-officedocument.presentationml.presentation|application/pdf");
         //在API>=19之后设置多个类型采用以下方式，setType不再支持多个类型
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
              intent.putExtra(Intent.EXTRA_MIME_TYPES, new String[]{DOC,DOCX, PPT, PPTX,PDF});
         }
         startActivityForResult(intent, 1001);
    } catch (ActivityNotFoundException e) {
    
    }

常见错误用法：

Intent intent = new Intent("android.intent.action.VIEW");
    intent.setData(mUri);
    intent.setType("image/*");
    intent.putExtra("pictureUrl","file://"+mPath+"/girl.jpg");
    startActivity(intent);

会出现：Intent.getData()方法返回值为空

**因为**：setType的时候把data置空了， setData的时候把type置空了

public Intent setData(Uri data) {
        mData = data;
        mType = null;
        return this;
    }

public Intent setType(String type) {
        mData = null;
        mType = type;
        return this;
    }

#### 解决： ####

一定要使用setDataAndType方法，才可以将两个值一起传入：

intent.setDataAndType(mUri,"image/*");