Android 下载并打开PDF,Doc,Dwg文档实例

今天项目中遇到这样一个需求 ,根据后台接口里pdf,doc,dwg文档的地址是一个URL ,需要根据文档的url 下载到本地(内部存储或内存卡)并用手机中能打开该文档的软件弹出来并打开,(这里需要做一个缓存,第一次查看这个文档是在服务器上下载并打开,以后打开不需要下载直接打开本地的文档)在网上找了些资料写了以下代码,下面分享给大家;

效果图:

代码:

这是一个单独的类首先接收intent传过来的url我是用url的后14位作为存储本地的文件名(这里根据自己服务器的文件命名规则而定) 拿到文件路径之后判断本地是否有此文件有则打开没有则从服务器上下载并打开 ;

  Intent intent = act.getIntent();
  final String Strname = intent.getStringExtra("docurl");
  //截取最后14位 作为文件名
  String s = Strname.substring(Strname.length()-14);
  //文件存储
  file1 = new File(Environment.getExternalStorageDirectory(), getFileName(s));
  new Thread() {
   public void run() {
    File file = new File( file1.getAbsolutePath());
    //判断是否有此文件
    if (file.exists()) {
     //有缓存文件,拿到路径 直接打开
     Message msg = Message.obtain();
     msg.obj = haha;
     msg.what = DOWNLOAD_SUCCESS;
     handler.sendMessage(msg);
     mProgressDialog.dismiss();
     return;
    }
//    本地没有此文件 则从网上下载打开
    File downloadfile = downLoad(Strname, file1.getAbsolutePath(), mProgressDialog);
//    Log.i("Log",file1.getAbsolutePath());
    Message msg = Message.obtain();
    if (downloadfile != null) {
     // 下载成功,安装....
     msg.obj = downloadfile;
     msg.what = DOWNLOAD_SUCCESS;
    } else {
     // 提示用户下载失败.
     msg.what = DOWNLOAD_ERROR;
    }
    handler.sendMessage(msg);
    mProgressDialog.dismiss();
   };
  }.start();

下载文档代码;

传入需要下载的文档的url 和存入内存的路径和dialog

 public static File downLoad(String serverpath, String savedfilepath, ProgressDialog pd) {
  try {
   URL url = new URL(serverpath);
   HttpURLConnection conn = (HttpURLConnection) url.openConnection();
   conn.setConnectTimeout(5000);
   if (conn.getResponseCode() == 200) {
    int max = conn.getContentLength();
    pd.setMax(max);
    InputStream is = conn.getInputStream();
    File file = new File(savedfilepath);
    FileOutputStream fos = new FileOutputStream(file);
    int len = 0;
    byte[] buffer = new byte[1024];
    int total = 0;
    while ((len = is.read(buffer)) != -1) {
     fos.write(buffer, 0, len);
     total += len;
     pd.setProgress(total);
    }
    fos.flush();
    fos.close();
    is.close();
    return file;
   } else {
    return null;
   }
  } catch (Exception e) {
   e.printStackTrace();

  }

 }

打开文件选择器

Handler handler = new Handler() {
  public void handleMessage(android.os.Message msg) {
   switch (msg.what) {
   case DOWNLOAD_SUCCESS:
    File file = (File) msg.obj;
    Intent intent = new Intent("android.intent.action.VIEW");
    intent.addCategory("android.intent.category.DEFAULT");
    intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.setDataAndType (Uri.fromFile(file), "application/pdf");
//    startActivity(intent);
    startActivity(Intent.createChooser(intent, "标题"));
    /**
     * 弹出选择框之后 把本activity销毁
     */
    finish();
    break;
   case DOWNLOAD_ERROR:
    Util.showToast(act,"文件加载失败");
    break;
   }
  }
 };

整体代码

public class list_item_doc extends BaseActivity {

 private ProgressDialog mProgressDialog;

 // 下载失败
 public static final int DOWNLOAD_ERROR = 2;
 // 下载成功
 public static final int DOWNLOAD_SUCCESS = 1;
 private File file1;
 @Override
 protected void onCreate(Bundle arg0) {
  // TODO Auto-generated method stub
  super.onCreate(arg0);

  initView();
 }

 private void initView() {
  // TODO Auto-generated method stub
  Intent intent = act.getIntent();
  final String Strname = intent.getStringExtra("url");
  mProgressDialog = new ProgressDialog(act);
  mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
  mProgressDialog.setCancelable(false);
  mProgressDialog.show();
  //截取最后14位 作为文件名
  String s = Strname.substring(Strname.length()-14);
  //文件存储
  file1 = new File(Environment.getExternalStorageDirectory(), getFileName(s));
  new Thread() {
   public void run() {

    File haha = new File( file1.getAbsolutePath());
    //判断是否有此文件
    if (haha.exists()) {
     //有缓存文件,拿到路径 直接打开
     Message msg = Message.obtain();
     msg.obj = haha;
     msg.what = DOWNLOAD_SUCCESS;
     handler.sendMessage(msg);
     mProgressDialog.dismiss();
     return;
    }
//    本地没有此文件 则从网上下载打开
    File downloadfile = downLoad(Strname, file1.getAbsolutePath(), mProgressDialog);
//    Log.i("Log",file1.getAbsolutePath());
    Message msg = Message.obtain();
    if (downloadfile != null) {
     // 下载成功,安装....
     msg.obj = downloadfile;
     msg.what = DOWNLOAD_SUCCESS;
    } else {
     // 提示用户下载失败.
     msg.what = DOWNLOAD_ERROR;
    }
    handler.sendMessage(msg);
    mProgressDialog.dismiss();
   };
  }.start();
 }

 /**
  * 下载完成后 直接打开文件
  */
 Handler handler = new Handler() {
  public void handleMessage(android.os.Message msg) {
   switch (msg.what) {
   case DOWNLOAD_SUCCESS:
    File file = (File) msg.obj;
    Intent intent = new Intent("android.intent.action.VIEW");
    intent.addCategory("android.intent.category.DEFAULT");
    intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.setDataAndType (Uri.fromFile(file), "application/pdf");
//    startActivity(intent);
    startActivity(Intent.createChooser(intent, "标题"));
    /**
     * 弹出选择框 把本activity销毁
     */
    finish();
    break;
   case DOWNLOAD_ERROR:
    Util.showToast(act,"文件加载失败");
    break;
   }
  }
 };
/**
 *
 */


 /**
  * 传入文件 url 文件路径 和 弹出的dialog 进行 下载文档
  */
 public static File downLoad(String serverpath, String savedfilepath, ProgressDialog pd) {
  try {
   URL url = new URL(serverpath);
   HttpURLConnection conn = (HttpURLConnection) url.openConnection();
   conn.setConnectTimeout(5000);
   if (conn.getResponseCode() == 200) {
    int max = conn.getContentLength();
    pd.setMax(max);
    InputStream is = conn.getInputStream();
    File file = new File(savedfilepath);  
    FileOutputStream fos = new FileOutputStream(file);
    int len = 0;
    byte[] buffer = new byte[1024];
    int total = 0;
    while ((len = is.read(buffer)) != -1) {
     fos.write(buffer, 0, len);
     total += len;
     pd.setProgress(total);
    }
    fos.flush();
    fos.close();
    is.close();
    return file;
   } else {
    return null;
   }
  } catch (Exception e) {
   e.printStackTrace();
   return null;
  }

 }

 public static String getFileName(String serverurl) {
  return serverurl.substring(serverurl.lastIndexOf("/") + 1);
 }

}

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