sasa

最新推荐文章于 2023-02-07 16:39:26 发布

ggyyleo

最新推荐文章于 2023-02-07 16:39:26 发布

阅读量145

点赞数

文章标签： Android C C++ C#

本文介绍了一个用于Android应用程序的抽象类Action，该类提供了一系列通用方法来简化Activity间的交互操作，如设置视图、获取共享偏好设置、显示对话框及导航至其他Action实例等。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

package com.jleo;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;

public abstract class Action {
	public void setActivity(Activity activity) {
		this.activity = activity;
	}

	public void apply(Activity activity) {
		apply(activity, null);
	}

	public void apply(Activity activity, Action precedentAction) {
		apply(activity,precedentAction,true);
	}

	public void apply(Activity activity, Action precedentAction,boolean setContentView4Me) {
		this.setActivity(activity);
		this.precedentAction = precedentAction;
		if(setContentView4Me)
			activity.setContentView(getViewId());
		apply();
	}

	public SharedPreferences getSharedPreferences(String preferenceName){
		return activity.getSharedPreferences(preferenceName, 0);
	}

	abstract void apply();

	public abstract int getViewId();

	public abstract void unapply(Activity activity);

	public <T> T findViewById(int id, Class<T> c) {
		return c.cast(activity.findViewById(id));
	}

	public Context getApplicationContext() {
		return activity.getApplicationContext();
	}

	public <T> T getSystemService(String locationService, Class<T> clazz) {
		return (T) activity.getSystemService(locationService);
	}

	public void showDialog(int dialogId) {
		activity.showDialog(dialogId);
	}

	public <T extends Action> void forward(Class<T> clazz, Action previousAction) {
		previousAction.unapply(activity);
		try {
			clazz.newInstance().apply(activity, previousAction);
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (InstantiationException e) {
			e.printStackTrace();
		} 
	}

	protected Activity activity;
	protected Action precedentAction;

	public void alert(int titleId) {
		new AlertDialog.Builder(activity).setIcon(R.drawable.alert_dialog_icon)
				.setTitle(titleId).setSingleChoiceItems(R.array.ok, 0,
						new DialogInterface.OnClickListener() {
							public void onClick(DialogInterface dialog,
									int whichButton) {
								dialog.dismiss();
							}
						}).show();
	}

	public void alert(String title) {
		new AlertDialog.Builder(activity).setIcon(R.drawable.alert_dialog_icon)
				.setTitle(title).setSingleChoiceItems(R.array.ok, 0,
						new DialogInterface.OnClickListener() {
							public void onClick(DialogInterface dialog,
									int whichButton) {
								dialog.dismiss();
							}
						}).show();
	}
}