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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