[Android开发工具类]对控件的一些常用方法

设置控件的高度方法, 宽度类似:

public static void setHeightInPx(View view, int height) {
		LayoutParams params = view.getLayoutParams();
		params.height = height;
		view.setLayoutParams(params);
	}

移动EditText的光标到文本结尾:

public static void moveCursor2End(EditText edt_content) {
		try {
			CharSequence text = edt_content.getText();
			if (text instanceof Spannable) {
				Spannable spanText = (Spannable) text;
				Selection.setSelection(spanText, text.length());
			}
		} catch (Exception e) {
		}
	}

获取控件Measure的高度, 用于控件还没初始化的时候, 比如onCreate中; 宽度类似:

public static int getMeasureHeight(View view) {
		int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
		int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
		view.measure(w, h);
		return view.getMeasuredHeight();
	}

监听EditText的输入,  如果1秒还没有输入东西则执行监听器方法:

public static void setSearchBarDelay(final EditText edt_search, final OnClickListener listener, View btn_clear) {
		try {

			if (edt_search == null)
				return;
			edt_search.addTextChangedListener(new TextWatcher() {
				private long latestTime = 0;
				private Handler handler = new Handler();
				private int delayMills = 1000;

				@Override
				public void onTextChanged(CharSequence s, int start, int before, int count) {
					// 最新输入的时间
					latestTime = System.currentTimeMillis();

					// 发送查询请求
					handler.postDelayed(new Runnable() {
						@Override
						public void run() {
							long currTime = System.currentTimeMillis();
							// 如果经过该延迟时间还没有新输入则搜索
							if ((currTime - latestTime) < (delayMills - 10))
								return;
							else {
								listener.onClick(null);
							}
						}
					}, delayMills);
				}

				@Override
				public void beforeTextChanged(CharSequence s, int start, int count, int after) {

				}

				@Override
				public void afterTextChanged(Editable s) {

				}
			});

			if (btn_clear == null)
				return;
			btn_clear.setOnClickListener(new OnClickListener() {

				@Override
				public void onClick(View v) {
					edt_search.setText("");
				}
			});
		} catch (Exception e) {
			LogUtil.d("", e.getMessage());
		}
	}

根据Class查找子控件, 比如查找出所有的TextView;  这是一个递归方法, 可以封装一下以去掉第二个参数

private static <T> void findViewsByClass(ViewGroup root, ArrayList<T> views, Class<T> targetView) {
		try {

			if (root == null)
				return;
			int count = root.getChildCount();
			View view;
			for (int i = 0; i < count; i++) {
				view = root.getChildAt(i);
				// 判断名称是否一致
				if (view.getClass().getName().equals(targetView.getName()))
					views.add((T) view);

				// 如果是容器 递归
				if (view instanceof ViewGroup) {
					findViewsByClass((ViewGroup) view, views, targetView);
				}
			}
		} catch (Exception e) {
			LogUtil.d("", e.getMessage());
		}
	}

 

dp转为px:

public static int dip2px(Context context, float dpValue) {
		final float scale = context.getResources().getDisplayMetrics().density;
		return (int) (dpValue * scale + 0.5f);
	}

把view的视图转成bitmap:

public static Bitmap getBitmapFromView(View view) {
		Bitmap bitmap = null;
		try {
			int width = view.getWidth();
			int height = view.getHeight();
			if (width != 0 && height != 0) {
				bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
				Canvas canvas = new Canvas(bitmap);
				view.layout(0, 0, width, height);
				view.draw(canvas);
			}
		} catch (Exception e) {
			bitmap = null;
			LogUtil.d("", e.getMessage());
		}
		return bitmap;
	}