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最新推荐文章于 2025-06-20 16:57:57 发布

最新推荐文章于 2025-06-20 16:57:57 发布 · 110 阅读

文章标签：

#Android #C #C++ #C#

本文介绍了一个用于 Android 开发的抽象类 Action 的实现方式。该类封装了与 Activity 相关的操作，如设置布局视图、查找视图元素、显示对话框等，旨在简化 Android 应用开发流程。

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package com.jleo;

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

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

	public void apply(Activity activity){
		this.setActivity(activity);
		activity.setContentView(getViewId());
	}

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

	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(TraceMe.DIALOG_INTERACT);
	}

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

	private Activity activity;
	private 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();
	}
}