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，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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