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代码中获得系统分区

Posted on Edited on In

前言:在最近的工作中涉及到从u盘拷贝大量数据到车机,偶尔有失效的情况,后面发现是sdcard存储空间不足,因此想在代码中展示出当前系统分区.查看系统分区在adb中为adb shell df

我们用如下方法可执行任意的adb shell命令,在此仅用”df”举例
  • 代码如下
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private String[] doRuntimeCmmd(String command) {
       Log.d(TAG, "doRuntimeCmmd:" + command);
       Process process = null;
       BufferedReader mOutReader = null;
       BufferedReader mErrorReader = null;
      try {
           process = Runtime.getRuntime().exec(command);
           Log.d(TAG, "process exec: " + process);
           
           mOutReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
           int mOutread;
      char[] outBuffer = new char[4096];
           StringBuffer output = new StringBuffer();
           while ((mOutread = mOutReader.read(outBuffer)) > 0) {
               output.append(outBuffer, 0, mOutread);
           }   
           mErrorReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));
           int mErrorread;
           char[] errorBuffer = new char[4096];
           StringBuffer error = new StringBuffer();
             while ((mErrorread = mErrorReader.read(errorBuffer)) > 0) {
               error.append(errorBuffer, 0, mErrorread);
           }
           
           process.waitFor();
         String[] mResult = { output.toString(), error.toString() };
           Log.d(TAG, command +" Result:" + mResult[0]);
           Log.d(TAG, command+ " Error:" + mResult[1]);
           return mResult;
             } catch (Exception e) {
           e.printStackTrace();
           String[] mResult = { "error", "error" };
           Log.d(TAG, command + "  Result = " + mResult[0] + "   Error = " + mResult[1]);
           return mResult;
    } finally {
           try {
               if (mOutReader != null) {
                   mOutReader.close();
               }
         if (mErrorReader != null) {
                   mErrorReader.close();
               }
           if (process != null) {
                   Log.d(TAG, "process destroy: " + process);
                   process.destroy();
               }
        } catch (IOException e) {
               e.printStackTrace();
           }
               }
   }

我们在代码中按如下使用

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String[] runtimeCmmd = doRuntimeCmmd("df");
MySortViewOfCMD textView = new MySortViewOfCMD(getActivity());
textView.setCurrentString(runtimeCmmd[0]);

用此方法得到的文本结果,并不像adb命令行中格式化的,需要自定义控件

  • 自定义view实现排版仅供参考
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    	public class MySortViewOfCMD extends TextView {

    	private String text;
    	int lineCount = 0;
    	private Paint paint = new Paint();
    	private ArrayMap<Integer, String[]> charByMap;
        private int mWidth = 900;// px
    	private int mHeight = 660;
    	private Scroller mScroller;
    	private int lastPointX;
    	private int lastPointY;
    	public MySortViewOfCMD(Context context) {
    		super(context);
    		initPaint(context);
    	}
    	public MySortViewOfCMD(Context context, AttributeSet attrs) {
    		super(context, attrs);
    		initPaint(context);
    	}
    	private void initPaint(Context context) {
    		paint.setColor(context.getResources().getColor(R.color.white));
    		paint.setTextSize(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
    				18, context.getResources().getDisplayMetrics()));
    		mScroller = new Scroller(context);
    	}
        @Override
    	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    		int width = measureDimension(mWidth, widthMeasureSpec);
    		int height = measureDimension(mHeight, heightMeasureSpec);
    		setMeasuredDimension(width, height);
    	}
        private int measureDimension(int defaultSize, int measureSpec) {

    		int result = defaultSize;
    		int specMode = MeasureSpec.getMode(measureSpec);
    		int specSize = MeasureSpec.getSize(measureSpec);
    	    if (specMode == MeasureSpec.EXACTLY) {
    			result = specSize;
    		} else if (specMode == MeasureSpec.AT_MOST) {
    			result = Math.min(defaultSize, specSize);
    		} else {
    		result = defaultSize;
    		}
    		return result;
    	}
        @Override
    	protected void onDraw(Canvas canvas) {
    		super.onDraw(canvas);

    		for (int i = 0; i < charByMap.size(); i++) {//绘制行
    	    String[] strings = charByMap.get(i);
    			for (int j = 0; j < strings.length; j++) {//绘制列
    				if (j == 1) {//针对第二列做特殊处理,防止与第一列重影
    					canvas.drawText(strings[j], j * (mWidth / 3) + 60,
    							i * 30 + 25, paint);
    				continue;
    				}
    				canvas.drawText(strings[j], j * (mWidth / 3), i * 30 + 25,
    						paint);
    			}
    		}
    		}

    	@Override
    	public boolean onTouchEvent(MotionEvent event) {
    	switch (event.getAction()) {
    		case MotionEvent.ACTION_DOWN:

    			lastPointX = (int) event.getX();
    			lastPointY = (int) event.getY();
    			return true;
    	case MotionEvent.ACTION_MOVE:
    			
    			int mXMove = (int) event.getX();
    			 int scrolledX = (int) (lastPointX - mXMove);
    	 if(getScrollX() + scrolledX < 0){//左边界
    				 scrollTo(0, 0);
    				 return true;
    			 }
    		if (getScrollX() + getWidth() + scrolledX < (mWidth / 3) * 5)//小于右边界
    				mScroller.startScroll(getScrollX(), 0,
    						lastPointX - (int) event.getX(), 0, 200);
    			invalidate();

    			break;
    	case MotionEvent.ACTION_UP:

    			break;
    		}
    		return true;
    	}
        /**
    	 * 平滑滚动        
    	 */
        @Override
    	public void computeScroll() {
    		if (mScroller.computeScrollOffset()) {
    			scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
    			invalidate();
    		}
    	}
    		public void setCurrentString(String text) {
    		this.text = text;
    		charByMap = saveCharByMap(text);
    		invalidate();
    	}
    	/**
    	 * 根据传进来的string保存每一行的字符
    	 * 
    	 * @param string
    	 *            -显示的字符串 eg: file size use \n filedddd size use \n
    	 */
    	 private ArrayMap<Integer, String[]> saveCharByMap(String string) {
    		String[] lineString = string.split("\n");
    		ArrayMap<Integer, String[]> charMap = new ArrayMap<Integer, String[]>();
    		lineCount = lineString.length;
    	for (int i = 0; i < lineCount; i++) {
    			String[] charItem = lineString[i].split("\\s+");// 按空格切出字符

    			charMap.put(i, charItem);
    		}
    			return charMap;
    	}

    }

    感谢android,感谢开源