Android 下載并打開PDF,Doc,Dwg文檔實例

更新時間：2017年04月14日 08:33:55 作者：Zhou灬hao

本篇文章主要介紹了Android 下載并打開PDF,Doc,Dwg文檔實例，具有一定的參考價值，有興趣的可以了解一下。

今天項目中遇到這樣一個需求 ,根據(jù)后臺接口里pdf,doc,dwg文檔的地址是一個URL ,需要根據(jù)文檔的url 下載到本地(內(nèi)部存儲或內(nèi)存卡)并用手機中能打開該文檔的軟件彈出來并打開,(這里需要做一個緩存,第一次查看這個文檔是在服務(wù)器上下載并打開,以后打開不需要下載直接打開本地的文檔)在網(wǎng)上找了些資料寫了以下代碼,下面分享給大家;

效果圖:

代碼:

這是一個單獨的類首先接收intent傳過來的url我是用url的后14位作為存儲本地的文件名(這里根據(jù)自己服務(wù)器的文件命名規(guī)則而定) 拿到文件路徑之后判斷本地是否有此文件有則打開沒有則從服務(wù)器上下載并打開 ;

  Intent intent = act.getIntent();
  final String Strname = intent.getStringExtra("docurl");
  //截取最后14位 作為文件名
  String s = Strname.substring(Strname.length()-14);
  //文件存儲
  file1 = new File(Environment.getExternalStorageDirectory(), getFileName(s));
  new Thread() {
   public void run() {
    File file = new File( file1.getAbsolutePath());
    //判斷是否有此文件
    if (file.exists()) {
     //有緩存文件,拿到路徑 直接打開
     Message msg = Message.obtain();
     msg.obj = haha;
     msg.what = DOWNLOAD_SUCCESS;
     handler.sendMessage(msg);
     mProgressDialog.dismiss();
     return;
    }
//    本地沒有此文件 則從網(wǎng)上下載打開
    File downloadfile = downLoad(Strname, file1.getAbsolutePath(), mProgressDialog);
//    Log.i("Log",file1.getAbsolutePath());
    Message msg = Message.obtain();
    if (downloadfile != null) {
     // 下載成功,安裝....
     msg.obj = downloadfile;
     msg.what = DOWNLOAD_SUCCESS;
    } else {
     // 提示用戶下載失敗.
     msg.what = DOWNLOAD_ERROR;
    }
    handler.sendMessage(msg);
    mProgressDialog.dismiss();
   };
  }.start();

下載文檔代碼;

傳入需要下載的文檔的url 和存入內(nèi)存的路徑和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();

  }

 }

打開文件選擇器

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, "標題"));
    /**
     * 彈出選擇框之后 把本activity銷毀
     */
    finish();
    break;
   case DOWNLOAD_ERROR:
    Util.showToast(act,"文件加載失敗");
    break;
   }
  }
 };

整體代碼

public class list_item_doc extends BaseActivity {

 private ProgressDialog mProgressDialog;

 // 下載失敗
 public static final int DOWNLOAD_ERROR = 2;
 // 下載成功
 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 作為文件名
  String s = Strname.substring(Strname.length()-14);
  //文件存儲
  file1 = new File(Environment.getExternalStorageDirectory(), getFileName(s));
  new Thread() {
   public void run() {

    File haha = new File( file1.getAbsolutePath());
    //判斷是否有此文件
    if (haha.exists()) {
     //有緩存文件,拿到路徑 直接打開
     Message msg = Message.obtain();
     msg.obj = haha;
     msg.what = DOWNLOAD_SUCCESS;
     handler.sendMessage(msg);
     mProgressDialog.dismiss();
     return;
    }
//    本地沒有此文件 則從網(wǎng)上下載打開
    File downloadfile = downLoad(Strname, file1.getAbsolutePath(), mProgressDialog);
//    Log.i("Log",file1.getAbsolutePath());
    Message msg = Message.obtain();
    if (downloadfile != null) {
     // 下載成功,安裝....
     msg.obj = downloadfile;
     msg.what = DOWNLOAD_SUCCESS;
    } else {
     // 提示用戶下載失敗.
     msg.what = DOWNLOAD_ERROR;
    }
    handler.sendMessage(msg);
    mProgressDialog.dismiss();
   };
  }.start();
 }

 /**
  * 下載完成后 直接打開文件
  */
 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, "標題"));
    /**
     * 彈出選擇框 把本activity銷毀
     */
    finish();
    break;
   case DOWNLOAD_ERROR:
    Util.showToast(act,"文件加載失敗");
    break;
   }
  }
 };
/**
 *
 */


 /**
  * 傳入文件 url 文件路徑 和 彈出的dialog 進行 下載文檔
  */
 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);
 }

}

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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