android 小工具集合

（一） 獲取緩存路徑

/**
	 * 獲取緩存根目錄
	 * 
	 * @param context
	 *            上下文對象
	 * @param isUnInstallDelete
	 *            卸載是否刪除緩存文件
	 * @param isSaveForLong
	 *            是否長時間保存
	 * @return
	 */
	@SuppressLint("NewApi")
	public static File getCacheFile(Context context, boolean isUnInstallDelete,
			boolean isSaveForLong) {
		File result = null;
		if (Environment.getExternalStorageState().equals(
				Environment.MEDIA_MOUNTED)
				|| !Environment.isExternalStorageRemovable()) {
			if (isUnInstallDelete) {
				if (isSaveForLong) {
					result = context.getExternalFilesDir(null);
				} else {
					result = context.getExternalCacheDir();
				}
			} else {
				result = Environment.getExternalStorageDirectory();
			}
		} else {
			// 沒有外部存儲卡，或外部存儲卡不可用
			if (isSaveForLong) {
				result = context.getFilesDir();
			} else {
				result = context.getCacheDir();
			}
		}
		return result;
	}

</pre><pre code_snippet_id="1582074" snippet_file_name="blog_20160219_1_6297346" name="code" class="java">

（二）將流對象轉換爲字符串

/**
	 * 把流對象轉換成字符串
	 */
	public static String convertStream2String(InputStream is) {
		StringBuilder sb = new StringBuilder();
		BufferedReader br = new BufferedReader(new InputStreamReader(is));
		String line = null;
		try {
			while ((line = br.readLine()) != null) {
				sb.append(line);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				is.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}

（三）打開文件

public class OpenFile {
	public static Intent openFile(File file){  
		if(file != null && file.exists()){
			String filePath = file.getAbsolutePath();
			/* 取得擴展名 */  
			String end=file.getName().substring(file.getName().lastIndexOf(".") + 1,file.getName().length()).toLowerCase();   
			/* 依擴展名的類型決定MimeType */  
			if(end.equals("m4a")||end.equals("mp3")||end.equals("mid")||  
					end.equals("xmf")||end.equals("ogg")||end.equals("wav")){  
				return getAudioFileIntent(filePath);  
			}else if(end.equals("3gp")||end.equals("mp4")){  
				return getAudioFileIntent(filePath);  
			}else if(end.equals("jpg")||end.equals("gif")||end.equals("png")||  
					end.equals("jpeg")||end.equals("bmp")){  
				return getImageFileIntent(filePath);  
			}else if(end.equals("apk")){  
				return getApkFileIntent(filePath);  
			}else if(end.equals("ppt")){  
				return getPptFileIntent(filePath);  
			}else if(end.equals("xls")){  
				return getExcelFileIntent(filePath);  
			}else if(end.equals("doc")){  
				return getWordFileIntent(filePath);  
			}else if(end.equals("pdf")){  
				return getPdfFileIntent(filePath);  
			}else if(end.equals("chm")){  
				return getChmFileIntent(filePath);  
			}else if(end.equals("txt")){  
				return getTextFileIntent(filePath,false);  
			}else{  
				return getAllIntent(filePath);  
			}  
		}else {
			return null;
		}
    }  
      
    //Android獲取一個用於打開APK文件的intent  
    public static Intent getAllIntent( String param ) {  
  
        Intent intent = new Intent();    
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);    
        intent.setAction(android.content.Intent.ACTION_VIEW);    
        Uri uri = Uri.fromFile(new File(param));  
        intent.setDataAndType(uri,"*/*");   
        return intent;  
    }  
    //Android獲取一個用於打開APK文件的intent  
    public static Intent getApkFileIntent( String param ) {  
  
        Intent intent = new Intent();    
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);    
        intent.setAction(android.content.Intent.ACTION_VIEW);    
        Uri uri = Uri.fromFile(new File(param ));  
        intent.setDataAndType(uri,"application/vnd.android.package-archive");   
        return intent;  
    }  
  
    //Android獲取一個用於打開VIDEO文件的intent  
    public static Intent getVideoFileIntent( String param ) {  
  
        Intent intent = new Intent("android.intent.action.VIEW");  
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);  
        intent.putExtra("oneshot", 0);  
        intent.putExtra("configchange", 0);  
        Uri uri = Uri.fromFile(new File(param ));  
        intent.setDataAndType(uri, "video/*");  
        return intent;  
    }  
  
    //Android獲取一個用於打開AUDIO文件的intent  
    public static Intent getAudioFileIntent( String param ){  
  
        Intent intent = new Intent("android.intent.action.VIEW");  
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);  
        intent.putExtra("oneshot", 0);  
        intent.putExtra("configchange", 0);  
        Uri uri = Uri.fromFile(new File(param ));  
        intent.setDataAndType(uri, "audio/*");  
        return intent;  
    }  
  
    //Android獲取一個用於打開Html文件的intent     
    public static Intent getHtmlFileIntent( String param ){  
  
        Uri uri = Uri.parse(param ).buildUpon().encodedAuthority("com.android.htmlfileprovider").scheme("content").encodedPath(param ).build();  
        Intent intent = new Intent("android.intent.action.VIEW");  
        intent.setDataAndType(uri, "text/html");  
        return intent;  
    }  
  
    //Android獲取一個用於打開圖片文件的intent  
    public static Intent getImageFileIntent( String param ) {  
  
        Intent intent = new Intent("android.intent.action.VIEW");  
        intent.addCategory("android.intent.category.DEFAULT");  
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
        Uri uri = Uri.fromFile(new File(param ));  
        intent.setDataAndType(uri, "image/*");  
        return intent;  
    }  
  
    //Android獲取一個用於打開PPT文件的intent     
    public static Intent getPptFileIntent( String param ){    
  
        Intent intent = new Intent("android.intent.action.VIEW");     
        intent.addCategory("android.intent.category.DEFAULT");     
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     
        Uri uri = Uri.fromFile(new File(param ));     
        intent.setDataAndType(uri, "application/vnd.ms-powerpoint");     
        return intent;     
    }     
  
    //Android獲取一個用於打開Excel文件的intent     
    public static Intent getExcelFileIntent( String param ){    
  
        Intent intent = new Intent("android.intent.action.VIEW");     
        intent.addCategory("android.intent.category.DEFAULT");     
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     
        Uri uri = Uri.fromFile(new File(param ));     
        intent.setDataAndType(uri, "application/vnd.ms-excel");     
        return intent;     
    }     
  
    //Android獲取一個用於打開Word文件的intent     
    public static Intent getWordFileIntent( String param ){    
  
        Intent intent = new Intent("android.intent.action.VIEW");     
        intent.addCategory("android.intent.category.DEFAULT");     
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     
        Uri uri = Uri.fromFile(new File(param ));     
        intent.setDataAndType(uri, "application/msword");     
        return intent;     
    }     
  
    //Android獲取一個用於打開CHM文件的intent     
    public static Intent getChmFileIntent( String param ){     
  
        Intent intent = new Intent("android.intent.action.VIEW");     
        intent.addCategory("android.intent.category.DEFAULT");     
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     
        Uri uri = Uri.fromFile(new File(param ));     
        intent.setDataAndType(uri, "application/x-chm");     
        return intent;     
    }     
  
    //Android獲取一個用於打開文本文件的intent     
    public static Intent getTextFileIntent( String param, boolean paramBoolean){     
  
        Intent intent = new Intent("android.intent.action.VIEW");     
        intent.addCategory("android.intent.category.DEFAULT");     
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     
        if (paramBoolean){     
            Uri uri1 = Uri.parse(param );     
            intent.setDataAndType(uri1, "text/plain");     
        }else{     
            Uri uri2 = Uri.fromFile(new File(param ));     
            intent.setDataAndType(uri2, "text/plain");     
        }     
        return intent;     
    }    
    //Android獲取一個用於打開PDF文件的intent     
    public static Intent getPdfFileIntent( String param ){     
  
        Intent intent = new Intent("android.intent.action.VIEW");     
        intent.addCategory("android.intent.category.DEFAULT");     
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     
        Uri uri = Uri.fromFile(new File(param ));     
        intent.setDataAndType(uri, "application/pdf");     
        return intent;     
    } 
}

(四) 日誌工具類

/**
 * 日誌工具類
 * @author Administrator
 *
 */
public class LogUtils {
	public static int DEBUG_LEVEL = 6;
	public static String TAG = "aijie";

    private static final int VERBOSE = 5;
    private static final int DEBUG = 4;
    private static final int INFO = 3;
    private static final int WARN = 2;
    private static final int ERROR = 1;

    /**
     * 打印長日誌的方法(分次打印)
     * @param msg
     * @return
     */
	public static void logL(String tag, String content) {
		int p = 2000;
		long length = content.length();
		if (length < p || length == p)
			Log.i(tag, content);
		else {
			while (content.length() > p) {
				String logContent = content.substring(0, p);
				content = content.replace(logContent, "");
				Log.i(tag, logContent);
			}
			Log.i(tag, content);
		}
	}
	
	public static void logL(String content) {
		int p = 2000;
		long length = content.length();
		if (length < p || length == p)
			Log.i(TAG, content);
		else {
			while (content.length() > p) {
				String logContent = content.substring(0, p);
				content = content.replace(logContent, "");
				Log.i(TAG, logContent);
			}
			Log.i(TAG, content);
		}
	}
    
    // 個人日誌工具方法
    public static int v(String msg) {
        if (DEBUG_LEVEL > VERBOSE) {
            return Log.v(TAG, msg);
        } else {
            return 0;
        }
    }

    public static int d(String msg) {
        if (DEBUG_LEVEL > DEBUG) {
            return Log.d(TAG, msg);
        } else {
            return 0;
        }
    }

    public static int i(String msg) {
        if (DEBUG_LEVEL > INFO) {
            return Log.i(TAG, msg);
        } else {
            return 0;
        }
    }

    public static int w(String msg) {
        if (DEBUG_LEVEL > WARN) {
            return Log.w(TAG, msg);
        } else {
            return 0;
        }
    }

    public static int e(String msg) {
        if (DEBUG_LEVEL > ERROR) {
            return Log.e(TAG, msg);
        } else {
            return 0;
        }
    }
    
    // 帶標籤的日誌工具方法
    public static int v(String tag, String msg) {
        if (DEBUG_LEVEL > VERBOSE) {
            return Log.v(tag, msg);
        } else {
            return 0;
        }
    }

    public static int d(String tag, String msg) {
        if (DEBUG_LEVEL > DEBUG) {
            return Log.d(tag, msg);
        } else {
            return 0;
        }
    }

    public static int i(String tag, String msg) {
        if (DEBUG_LEVEL > INFO) {
            return Log.i(tag, msg);
        } else {
            return 0;
        }
    }

    public static int w(String tag, String msg) {
        if (DEBUG_LEVEL > WARN) {
            return Log.w(tag, msg);
        } else {
            return 0;
        }
    }

    public static int e(String tag, String msg) {
        if (DEBUG_LEVEL > ERROR) {
            return Log.e(tag, msg);
        } else {
            return 0;
        }
    }
}

(五) Toast工具類-- 消除不斷彈出的困擾

/**
 * ToastUtil -- 消除不斷提示的困擾
 */
public class ToastUtil {

    private static Toast mToast;
    private static Handler mHandler = new Handler();
    private static Runnable mRunnable = new Runnable() {
        public void run() {
            mToast.cancel();
            mToast = null;              // toast 隱藏後，將其置爲 null
        }
    };

    public static void showToast(Context context, String message, int duration) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.custom_toast, null);          //自定義佈局
        TextView text = (TextView) view.findViewById(R.id.toast_message);
        text.setText(message);          //顯示的提示文字                                              
        mHandler.removeCallbacks(mRunnable);
        if (mToast == null) {           // 只有 mToast == null 時才重新創建，否則只需更改提示文字
            mToast = new Toast(context);
            mToast.setDuration(Toast.LENGTH_LONG);
            mToast.setGravity(Gravity.BOTTOM, 0, 150);
            mToast.setView(view);
        }
        mHandler.postDelayed(mRunnable, duration);  // 延遲 duration 事件隱藏 toast
        mToast.show();
    }

    // 獲取 String.xml 中的提示信息
    public static void showToast(Context context, int strId, int duration) {
        showToast(context, context.getString(strId), duration);
    }
}