Android 实现获取手机里面的所有图片详解及实例

android 实现获取手机里面的所有图片详解及实例

实现代码：

public class mainactivity extends activity { 

//查看图片按钮 
  private button look; 
  private button add; 
//显示图片名称的list 
  listview show_list; 
  arraylist names = null; 
  arraylist descs= null; 
  arraylist filenames = null; 
  @override 
  protected void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.activity_main); 
    look = (button) findviewbyid(r.id.look); 
    add = (button) findviewbyid(r.id.add); 
    show_list = (listview) findviewbyid(r.id.show_list); 
    look.setonclicklistener(new view.onclicklistener() { 
      @override 
      public void onclick(view view) { 
        names = new arraylist(); 
        descs = new arraylist(); 
        filenames = new arraylist(); 
        cursor cursor = getcontentresolver().query( 
            mediastore.images.media.external_content_uri, null, null, null, null); 
        while (cursor.movetonext()) { 
          //获取图片的名称 
          string name = cursor.getstring(cursor.getcolumnindex(mediastore.images.media.display_name)); 
          //获取图片的生成日期 
          byte[] data = cursor.getblob(cursor.getcolumnindex(mediastore.images.media.data)); 
          //获取图片的详细信息 
          string desc = cursor.getstring(cursor.getcolumnindex(mediastore.images.media.description)); 
          names.add(name); 
          descs.add(desc); 
          filenames.add(new string(data, 0, data.length - 1)); 
        } 
        list<map<string, object>> listitems = new arraylist<>(); 
        for (int i = 0; i < names.size(); i++) { 
          map<string, object> map = new hashmap<>(); 
          map.put("name", names.get(i)); 
          map.put("desc", descs.get(i)); 
          listitems.add(map); 
        } 
        //设置adapter 
        simpleadapter adapter = new simpleadapter(mainactivity.this, listitems, 
            r.layout.line, new string[]{"name", "desc"}, new int[]{r.id.name, r.id.desc}); 
 
        show_list.setadapter(adapter); 
      } 
    }); 
 
    ///list的点击事件 
  show_list.setonitemclicklistener(new adapterview.onitemclicklistener() { 
    @override 
    public void onitemclick(adapterview<?> adapterview, view view, int i, long l) { 
      view viewdiag = getlayoutinflater().inflate(r.layout.view,null); 
      imageview image = (imageview)viewdiag.findviewbyid(r.id.image); 
      image.setimagebitmap(bitmapfactory.decodefile((string) filenames.get(i))); 
      new alertdialog.builder(mainactivity.this).setview(viewdiag) 
          .setpositivebutton("确定",null).show(); 
    } 
  }); 
  } 
} 

xml：

<!--获取手机存储卡权限-->
<uses-permission android:name="android.permission.read_external_storage"/>

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