Java、Android、Ios开发总结（一） - JAVA

SETTING); intent.setClass(context,PasswordActivity.class); startActivityForResult(intent, RequestCode.CODE_PASSWORD_ACTIVITY);

以上面代码为例

a.调用名称为CODE_PASSWORD_ACTIVITY
b.右侧值为数值,第一个为0，余下的的为1< c.放在常量集合的接口中

// 自定义RequestCode.CODE_PASSWORD_ACTIVITY
	interface RequestCode {
		public static final int CODE_PASSWORD_ACTIVITY = 0;
		public static final int CODE_SETTING_ACTIVITY = 1<<0;
		public static final int CODE_FAVORITE_ACTIVITY = 1<<1;
	}

以上参考Objective-C 中枚举类型和 Android中常量命名规则

// enum {
	// UIControlStateNormal = 0, 常规状态显现
	// UIControlStateHighlighted = 1 << 0, 高亮状态显现
	// UIControlStateDisabled = 1 << 1, 禁用的状态才会显现
	// UIControlStateSelected = 1 << 2, 选中状态
	// UIControlStateApplication = 0x00FF0000, 当应用程序标志时
	// UIControlStateReserved = 0xFF000000 为内部框架预留，可以不管他
	// };

/**
	 * Standard constants and tools for placing an object within a potentially
	 * larger container.
	 */
	public class Gravity
	{
	    /** Constant indicating that no gravity has been set **/
	    public static final int NO_GRAVITY = 0x0000;

	    ...
	    
	    /** Place object in the vertical center of its container, not changing its
	     *  size. */
	    public static final int CENTER_VERTICAL = AXIS_SPECIFIED<
  
   

8.Android项目中Log输出，类别分verbose、debug、info、warn、error、assert, 以下是个人习惯，仅供参考
   


   

    过滤级别为verbose
   
     
     
    public class WelcomeActivity {

	private static final String TAG = WelcomeActivity.class.getSimpleName(); // 建议
	// private static final String TAG = “WelcomeActivity”; // 不建议，一旦重命名类名，类名不会自动改变，一不注意会影响后期调试

	@Override
	public void onCreate(Bundle savedInstanceState) {

		Log.i(TAG, "onCreate :: savedInstanceState = " + savedInstanceState);
		// 因为是信息级别，所以比较喜欢用Log.i, 输出内容是参照C#中Log输出编写，具体格式为:方法名 + “ :: ”(::左右有空格) + 变量名 + “ = ”(左右有空格) + 变量
		super.onCreate(savedInstanceState);
	}

	@Override
	protected void onResume() {

		Log.i(TAG, "onResume ::");
		super.onResume();
	}

	/**
	* Add shortcut to launcher  (多写注释和描述方法，易于代码维护和阅读，具体格式可以参考Java的文档规范)
	*/
	private void addShortcut() {

		Log.i(TAG, "addShortcut ::");
		// 信息级别的输出,所以喜欢用Log.i

		Intent intent = new Intent(
				"com.android.launcher.action.INSTALL_SHORTCUT");
		intent.putExtra(Intent.EXTRA_SHORTCUT_NAME,
				getString(R.string.app_name));
		intent.putExtra("duplicate", false);
		ComponentName componentName = new ComponentName(getPackageName(),
				getPackageName() + "." + getLocalClassName());

		Log.d(TAG, "addShortcut :: componentName = " + componentName);
		// 调试级别的输出，所以用Log.d

		intent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, new Intent(
				Intent.ACTION_MAIN).setComponent(componentName));
		ShortcutIconResource iconResource = Intent.ShortcutIconResource
				.fromContext(context, R.drawable.ic_launcher);
		intent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, iconResource);
		sendBroadcast(intent);
	}

	/**
	 * Judge have the shortcut on launcher or not
	 * (多写注释和描述方法，易于代码维护和阅读，具体格式可以参考Java的文档规范)
	 * @return ...
	 */
	private boolean hasShortcut() {
		
		Log.i(TAG, "hasShortcut ::");
		String url;
		if (Build.VERSION.SDK_INT < 8) {
			url = "content://com.android.launcher.settings/favorites notify=true";
		} else {
			url = "content://com.android.launcher2.settings/favorites notify=true";
		}

		Cursor cursor = null;
		try {
			ContentResolver resolver = getContentResolver();
			cursor = resolver.query(Uri.parse(url), new String[] { "title" },
					"title= ", new String[] { getString(R.string.app_name) },
					null);
			if (cursor != null && cursor.getCount() > 0) {
				cursor.close();
				return true;
			}
		} catch (Exception e) {
			Log.e(TAG, "hasShortcut :: Exception => Error: " + e.getMessage());
			// 错误级别的输出，所以用Log.e
			e.printStackTrace();
			// 输出错误栈堆里的信息，方便调试
		} finally {
			if (cursor != null && !cursor.isClosed()) {
				cursor.close();
			}
		}

		return false;
	}

	/**
	 * Get the section tags like 'Hot tag' or 'search history'
	 * (多写注释和描述方法，易于代码维护和阅读，具体格式可以参考Java的文档规范)
	 * @param groups
	 * @return
	 */
	private List
     
       getGroups(String[] groups) {

 		Log.i(TAG, "getGroups :: groups = " + groups)

Java、Android、Ios开发总结（一）(二)