Android选择图片或视频进行循环播放

项目要求对本地图片或者视频进行轮播，功能实现完成后发现只是在模拟器上运行ok,后来发现是文件路径的原因。
文件uri的头部有两种一种是以file开头一种是以content开头要进行判断转化

实现如下：

视频 点击吊起文件查看：

private void setvideopath() { 
   intent intent = new intent(intent.action_get_content); 
   intent.settype("*/*");//设置类型，我这里是任意类型，任意后缀的可以这样写。 
   intent.addcategory(intent.category_openable); 
   startactivityforresult(intent, video_path); 
 } 

在返回中取得选中文件路径

@override 
  public void onactivityresult(int requestcode, int resultcode, intent data) { 
    if (resultcode != result_ok) 
      return; 
 
    switch (requestcode) { 
    
      case video_path: 
        uri uri = data.getdata(); 
        string path = getpath( uri); 
        showtoastreal("你选中的视频路径：" + path); 
        sputils.getinstace(this).savestring("videopath", path); 
        break; 
      case pic_path: 
        uri picuri = data.getdata(); 
        string picpath = getpath(picuri); 
        showtoastreal("你选中的图片路径：" + picpath); 
        sputils.getinstace(this).savestring("picpath", picpath); 
        break; 
    } 
  } 

public string getpath(uri uri) { 
    string path; 
    if ("file".equalsignorecase(uri.getscheme())) {//使用第三方应用打开 
      path = uri.getpath(); 
      return path; 
    } 
    if (build.version.sdk_int > build.version_codes.kitkat) {//4.4以后 
      path = getpath(this, uri); 
    } else {//4.4以下下系统调用方法 
      path = getrealpathfromuri(uri); 
    } 
    return path; 
  } 
 
  @suppresslint("newapi") 
  public string getpath(final context context, final uri uri) { 
 
    final boolean iskitkat = build.version.sdk_int >= build.version_codes.kitkat; 
 
    // documentprovider 
    if (iskitkat && documentscontract.isdocumenturi(context, uri)) { 
      // externalstorageprovider 
      if (isexternalstoragedocument(uri)) { 
        final string docid = documentscontract.getdocumentid(uri); 
        final string[] split = docid.split(":"); 
        final string type = split[0]; 
 
        if ("primary".equalsignorecase(type)) { 
          return environment.getexternalstoragedirectory() + "/" + split[1]; 
        } 
      } 
      // downloadsprovider 
      else if (isdownloadsdocument(uri)) { 
 
        final string id = documentscontract.getdocumentid(uri); 
        final uri contenturi = contenturis.withappendedid( 
            uri.parse("content://downloads/public_downloads"), long.valueof(id)); 
 
        return getdatacolumn(context, contenturi, null, null); 
      } 
      // mediaprovider 
      else if (ismediadocument(uri)) { 
        final string docid = documentscontract.getdocumentid(uri); 
        final string[] split = docid.split(":"); 
        final string type = split[0]; 
 
        uri contenturi = null; 
        if ("image".equals(type)) { 
          contenturi = mediastore.images.media.external_content_uri; 
        } else if ("video".equals(type)) { 
          contenturi = mediastore.video.media.external_content_uri; 
        } else if ("audio".equals(type)) { 
          contenturi = mediastore.audio.media.external_content_uri; 
        } 
 
        final string selection = "_id=?"; 
        final string[] selectionargs = new string[]{split[1]}; 
 
        return getdatacolumn(context, contenturi, selection, selectionargs); 
      } 
    } 
    // mediastore (and general) 
    else if ("content".equalsignorecase(uri.getscheme())) { 
      return getdatacolumn(context, uri, null, null); 
    } 
    // file 
    else if ("file".equalsignorecase(uri.getscheme())) { 
      return uri.getpath(); 
    } 
    return null; 
  } 
  /** 
      * get the value of the data column for this uri. this is useful for 
      * mediastore uris, and other file-based contentproviders. 
      * 
      * @param context    the context. 
      * @param uri      the uri to query. 
      * @param selection   (optional) filter used in the query. 
      * @param selectionargs (optional) selection arguments used in the query. 
      * @return the value of the _data column, which is typically a file path. 
      */ 
   public string getdatacolumn(context context, uri uri, string selection, 
                 string[] selectionargs) { 
 
         cursor cursor = null; 
         final string column = "_data"; 
         final string[] projection = {column}; 
 
         try { 
             cursor = context.getcontentresolver().query(uri, projection, selection, selectionargs, 
                     null); 
             if (cursor != null && cursor.movetofirst()) { 
                 final int column_index = cursor.getcolumnindexorthrow(column); 
                 return cursor.getstring(column_index); 
               } 
           } finally { 
             if (cursor != null) 
                 cursor.close(); 
           } 
         return null; 
       } 
 
       /** 
    * @param uri the uri to check. 
    * @return whether the uri authority is externalstorageprovider. 
    */ 
       public boolean isexternalstoragedocument(uri uri) { 
         return "com.android.externalstorage.documents".equals(uri.getauthority()); 
       } 
 
       /** 
    * @param uri the uri to check. 
    * @return whether the uri authority is downloadsprovider. 
    */ 
       public boolean isdownloadsdocument(uri uri) { 
         return "com.android.providers.downloads.documents".equals(uri.getauthority()); 
       } 
 
       /** 
    * @param uri the uri to check. 
    * @return whether the uri authority is mediaprovider. 
    */ 
       public boolean ismediadocument(uri uri) { 
         return "com.android.providers.media.documents".equals(uri.getauthority()); 
       } 

实现视频轮播

public class videoactivity extends baseactivity { 
 
  @bind(r.id.sv_ad) 
  surfaceview vv; 
  @bind(r.id.id_ig_back) 
  imageview idigback; 
  private mediaplayer mplayer; 
  private string path; 
 
  @override 
  protected void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    requestwindowfeature(window.feature_no_title); 
    getwindow().setflags(windowmanager.layoutparams.flag_fullscreen, 
        windowmanager.layoutparams.flag_fullscreen); 
    setcontentview(r.layout.activity_video); 
    butterknife.bind(this); 
    verifystoragepermissions(this); 
    init(); 
//    init2(); 
  } 
 
  private void init2() { 
    string path = sputils.getinstace(videoactivity.this).getstring("videopath"); 
    uri uri = uri.parse("file://" + path); 
    try { 
      mediaplayer mediaplayer = new mediaplayer(); 
      mediaplayer.setaudiostreamtype(audiomanager.stream_music); 
      mediaplayer.setdatasource(getapplicationcontext(), uri); 
      mediaplayer.prepare(); 
      mediaplayer.start(); 
    } catch (ioexception e) { 
      e.printstacktrace(); 
    } 
 
  } 
 
 
  private void init() { 
    idigback.setonclicklistener(new view.onclicklistener() { 
      @override 
      public void onclick(view v) { 
        finish(); 
      } 
    }); 
    vv.getholder().addcallback(new surfaceholder.callback() { 
 
      @override 
      public void surfacedestroyed(surfaceholder holder) { 
        if (mplayer != null) { 
          mplayer.stop(); 
          mplayer.release(); 
          mplayer = null; 
        } 
      } 
 
      @override 
      public void surfacecreated(surfaceholder holder) { 
 
        path = sputils.getinstace(videoactivity.this).getstring("videopath"); 
 
        try { 
          if (mplayer == null) { 
            mplayer = mediaplayer.create(videoactivity.this, uri.parse("file://" + path)); 
          } 
          if(mplayer==null){ 
            showtoastreal("请在个人中心中选择正确的视频"); 
          } 
          mplayer.setdisplay(holder);//将surfaceholder关联mediaplayer 
          mplayer.setlooping(true); 
          mplayer.start(); 
 
          mplayer.setonerrorlistener(new mediaplayer.onerrorlistener() { 
 
            @override 
            public boolean onerror(mediaplayer mp, int what, 
                        int extra) { 
              // todo auto-generated method stub 
              return false; 
            } 
          }); 
        } catch (exception e) { 
          e.printstacktrace(); 
        } 
 
      } 
 
      @override 
      public void surfacechanged(surfaceholder holder, int format, 
                    int width, int height) { 
 
      } 
    }); 
  } 
 
  public void onback(view view) { 
    finish(); 
  } 
 
  @override 
  public void loadnetdata() { 
 
  } 
 
  private static final int request_external_storage = 1; 
  private static string[] permissions_storage = { 
      manifest.permission.read_external_storage, 
      manifest.permission.write_external_storage 
  }; 
 
 
  /** 
   * 检查应用程序是否允许写入存储设备 
   * <p> 
   * <p> 
   * <p> 
   * 如果应用程序不允许那么会提示用户授予权限 
   * 
   * @param activity 
   */ 
  public static void verifystoragepermissions(activity activity) { 
    // check if we have write permission 
    int permission = activitycompat.checkselfpermission(activity, manifest.permission.write_external_storage); 
 
 
    if (permission != packagemanager.permission_granted) { 
      // we don't have permission so prompt the user 
      activitycompat.requestpermissions( 
          activity, 
          permissions_storage, 
          request_external_storage 
      ); 
    } 
  } 
} 

layout的实现

<?xml version="1.0" encoding="utf-8"?> 
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:orientation="vertical" android:layout_width="match_parent" 
 android:layout_height="match_parent"> 
 
<surfaceview 
 android:id="@+id/sv_ad" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" /> 
 <imageview 
  android:id="@+id/id_ig_back" 
  android:layout_width="80dp" 
  android:layout_height="80dp" 
 
  android:layout_margintop="16dp" 
  android:padding="16dip" 
  android:src="@drawable/icon_back_white" /> 
</relativelayout> 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。