在安卓中开发视频文件浏览器

Question

我是Android开发的新手。我需要创建视频文件浏览器，视频文件必须显示为缩略图，支持上下滑动。我应该从什么开始？谢谢，等待您的评论..

Answer 1

这是您问题的完整解决方案。

   public class EntertainmentActivity extends Activity {
      private static final String MEDIA_PATH = new String( "/mnt/sdcard/VideoFolder");
        static String[] fileList = null;
        GridView gridView;
        static String FILE_PATH = "/mnt/sdcard/VideoFolder/";
        String MiME_TYPE = "video/mp4";
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            updateSongList();
            gridView = (GridView) findViewById(R.id.gridView1);
            File dir = new File(MEDIA_PATH);
            if (dir.exists()) {
            } else {
             dir.mkdirs();
            }
            if (fileList != null) {
                gridView.setAdapter(new ImageAdapter(this, fileList));
            }
            gridView.setOnItemClickListener(new OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> arg0, View arg1,
                        int position, long arg3) {
                    String videoFilePath = FILE_PATH + fileList[position];
                    System.out.println("******************************videoFilePath****************" + videoFilePath);
                    System.out.println("******************************MiME_TYPE****************"+ MiME_TYPE);
                    Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
                    File newFile = new File(videoFilePath);
                    intent.setDataAndType(Uri.fromFile(newFile), MiME_TYPE);
                    startActivity(intent);
                }
            });
        }
        public void updateSongList() {
            File videoFiles = new File(MEDIA_PATH);
            Log.d("*********Value of videoFiles******", videoFiles.toString());
            if (videoFiles.isDirectory()) {
                fileList = videoFiles.list();
            }
            if (fileList == null) {
                System.out.println("File doesnot exit");
                Toast.makeText(this, "There is no file please add files to "+MEDIA_PATH, Toast.LENGTH_SHORT).show();
            } else {
                System.out.println("fileList****************" + fileList);
                for (int i = 0; i < fileList.length; i++) {
                    Log.e("Video:" + i + " File name", fileList[i]);
                }
            }
        }

网格视图适配器

public class ImageAdapter extends BaseAdapter {
    private Context context;
    private final String[] VideoValues;
    public ImageAdapter(Context context, String[] VideoValues) {
        this.context = context;
        this.VideoValues = VideoValues;
    }
    public View getView(int position, View convertView, ViewGroup parent) {
        System.out.println("***********IngetView************");
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View gridView;
        if (convertView == null) {
            gridView = new View(context);
            // get layout from gridlayout.xml
            gridView = inflater.inflate(R.layout.grid_row, null);
            // set value into textview
            TextView textView = (TextView) gridView
                    .findViewById(R.id.grid_item_label);
            textView.setText(EntertainmentActivity.fileList[position]);
            System.out.println("value of fileList[position]" + EntertainmentActivity.fileList[0]);
            // set image
            ImageView imageThumbnail = (ImageView) gridView
                    .findViewById(R.id.grid_item_image);
            Bitmap bmThumbnail;
            System.out
                    .println(">>>>>>>>>>>>>>>>>>>>>>>>>>>> file path>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"
                            + EntertainmentActivity.fileList[position]);
            bmThumbnail = ThumbnailUtils
                    .createVideoThumbnail(EntertainmentActivity.FILE_PATH + EntertainmentActivity.fileList[position],
                            MediaStore.Video.Thumbnails.MINI_KIND);
            if (bmThumbnail != null) {
                System.out
                        .println(">>>>>>>>>>>>>>>>>>>>>>>>>>>> THUMB NAIL>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
                imageThumbnail.setImageBitmap(bmThumbnail);
            } else {
                System.out
                        .println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>NO THUMB NAIL>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
            }
        } else {
            gridView = (View) convertView;
        }
        return gridView;
    }
    public int getCount() {
        // return 0;
        return VideoValues.length;
    }
    public Object getItem(int position) {
        return null;
    }
    public long getItemId(int position) {
        return 0;
    }
}

主.xml布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ff99cc00" >
    <GridView
        android:id="@+id/gridView1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:columnWidth="200dp"
        android:gravity="center"
        android:horizontalSpacing="10dp"
        android:numColumns="4"
        android:padding="10dp"
        android:stretchMode="columnWidth"
        android:verticalSpacing="10dp" >
    </GridView>
</RelativeLayout>

grid_row.xml行布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="320dp"
    android:layout_height="wrap_content"
    android:background="@android:color/white"
    android:orientation="vertical" >
    <ImageView
        android:id="@+id/grid_item_image"
        android:layout_width="320dp"
        android:layout_height="300dp" />
    <TextView
        android:id="@+id/grid_item_label"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#92d050"
        android:ellipsize="marquee"
        android:gravity="center"
        android:padding="3dp"
        android:singleLine="true"
        android:text="test string"
        android:textColor="@android:color/white" />
</LinearLayout>

安卓清单.xml

不要忘记将用户权限放在 Android Manifest 中

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />