android中activity可以响应外部的action的例子(可以用这个来导入外部文件)

如果我们在文件浏览器中点击一个文件，然后点击它，会弹出一个列表给你选择

如果使自己的应用也出现在这个列表上，必须在menifest的这个activity下加入：

        <activity
            android:name="com.example.clickabletextview.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <action android:name="android.intent.action.EDIT" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data android:mimeType="application/pdf" />
                <data android:mimeType="image/bmp" />
                <data android:mimeType="image/tiff" />
                <data android:mimeType="image/gif" />
                <data android:mimeType="image/jpeg" />
                <data android:mimeType="image/x-ms-bmp" />
                <data android:mimeType="image/png" />
                <data android:mimeType="image/x-pcx" />
                <data android:mimeType="image/targa" />
                <data android:mimeType="image/x-photoshop" />
                <data android:mimeType="text/plain" />
                <data android:mimeType="text/xml" />
                <data android:mimeType="text/html" />

            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />

                <data
                    android:host="*"
                    android:mimeType="*/*"
                    android:pathPattern=".*\\.pdf"
                    android:scheme="file" />

                <data
                    android:host="*"
                    android:mimeType="*/*"
                    android:pathPattern=".*\\.jpg"
                    android:scheme="file" />

                <data
                    android:host="*"
                    android:mimeType="*/*"
                    android:pathPattern=".*\\.bmp"
                    android:scheme="file" />
                <data
                    android:host="*"
                    android:mimeType="*/*"
                    android:pathPattern=".*\\.png"
                    android:scheme="file" />

                <data
                    android:host="*"
                    android:mimeType="*/*"
                    android:pathPattern=".*\\.txt"
                    android:scheme="file" />

            </intent-filter>
        </activity>

然后在activity的oncreate上接收这个intent:

		Intent intent = this.getIntent();
		int flags = intent.getFlags();
		if ((flags & Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY) == 0) {
			if (intent.getAction() != null && Intent.ACTION_VIEW.equals(intent.getAction())) {
				if (SCHEME_FILE.equals(intent.getScheme()) || SCHEME_CONTENT.equals(intent.getScheme())) {

					String i_type = getIntent().getType();

					// mImportingUri=file:///storage/emulated/0/Vlog.xml
					intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
					mImportingUri = intent.getData();
					System.out.println("====mImportingUri=" + mImportingUri);

					InputStream is = null;
					try {
						is = getContentResolver().openInputStream(mImportingUri);
					} catch (Exception e) {
						System.out.println("====e="+e);
					}

					if (mImportingUri != null && SCHEME_FILE.equalsIgnoreCase(mImportingUri.getScheme())) {
						//Is file
						startToCopyFile(is);
					}else if(mImportingUri != null && SCHEME_CONTENT.equalsIgnoreCase(mImportingUri.getScheme())){
						startCopyMedia(is);
					}

				}
			}
		}

这里如果发现要导入的文件是media的格式

private boolean startCopyMedia(InputStream is) {
		Cursor c = null;
		try {
			c = getContentResolver().query(mImportingUri,
					new String[] {MediaStore.MediaColumns.DISPLAY_NAME, MediaStore.MediaColumns.SIZE},
					null, null, null);
			if (c != null && c.moveToFirst()) {
				int dn_index = c.getColumnIndexOrThrow(MediaStore.MediaColumns.DISPLAY_NAME);
				fromFileName = c.getString(dn_index);
				int s_index = c.getColumnIndexOrThrow(MediaStore.MediaColumns.SIZE);
				fromFileSize = c.getLong(s_index);
			}
		} catch (Exception e) {
			System.out.println("===query e="+e);
		}
		return true;
	}

如果发现要导入的文件是txt格式,则我们在sd卡下建立一个tmp的文件夹，把这个文件拷贝进去:

	public static void makesureFileExist(String path) {
		String separator = File.separator;
		int index = path.lastIndexOf(separator);
		path = path.substring(0, index);
		File f = new File(path);
		f.mkdirs();

		File f1 = new File(path);
		try {
			f1.createNewFile();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static String getSDPath(){
	       File sdDir = null;
	       boolean sdCardExist = Environment.getExternalStorageState()
	                           .equals(android.os.Environment.MEDIA_MOUNTED);   //判断sd卡是否存在
	       if(sdCardExist)
	       {
	         sdDir = Environment.getExternalStorageDirectory();//获取跟目录
	      }
	       if(sdDir!=null){
	    	   return sdDir.toString();
	       }else
	    	   return null;

	}

	private String getName(Uri uri) {
		String str = uri.toString();
		int index = str.lastIndexOf(File.separator);
		String name = str.substring(index,str.length());
		return name;
	}

	private boolean startToCopyFile(InputStream is) {

		String fileName = getSDPath()+tmpPath+File.separator+getName(mImportingUri);
		makesureFileExist(fileName);
		File toFile = new File(fileName);
		CopyThread mCopyThread = new CopyThread(is, toFile);
		new Thread(mCopyThread).start();
		return true;
	}

	private class CopyThread implements Runnable {

		private File toFile;
		private InputStream fosfrom = null;

		public CopyThread(InputStream fosfrom, File toFile) {
			this.fosfrom = fosfrom;
			this.toFile = toFile;
		}

		@Override
		public void run() {
			try {
				TimeUnit.MILLISECONDS.sleep(800);

				FileInputStream fosfrom = null;
				if (this.fosfrom != null) {
					fosfrom = (FileInputStream) this.fosfrom;
				}
				FileOutputStream fosto = new FileOutputStream(toFile);
				byte bt[] = new byte[1024];
				int c;
				int time = 0;
				while ((c = fosfrom.read(bt)) > 0) {
					fosto.write(bt, 0, c);
				}
				if (fosfrom != null) {
					fosfrom.close();
				}
				fosto.close();

			} catch (Exception e) {
				return;
			} finally {
				try {
					if (this.fosfrom != null) {
						this.fosfrom.close();
					}
				} catch (IOException e) {
				}
			}
		}
	}
	

代码:http://download.csdn.net/detail/baidu_nod/7712765

android中activity可以响应外部的action的例子(可以用这个来导入外部文件)