Fragment基類,Activity基類

這兩天看了黑馬程式員“新聞”項目，覺得BaseFragment寫法不錯。是以來貼代碼的。

BaseFragment.java

<span style="font-size:14px;">package com.heima.news.base;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.heima.news.MainActivity;
import com.jeremyfeinstein.slidingmenu.lib.SlidingMenu;

public abstract class BaseFragment extends Fragment {
	public View view;
	public Context ct;
	public SlidingMenu sm;

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);
		initData(savedInstanceState);
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		ct = getActivity();
		sm = ((MainActivity) getActivity()).getSlidingMenu();
	}

	/**
	 * setContentView;
	 */
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		view = initView(inflater);

		return view;
	}

	public View getRootView() {
		return view;
	}

	/**
	 * 初始化view
	 */
	public abstract View initView(LayoutInflater inflater);

	/**
	 * 初始化資料
	 */
	public abstract void initData(Bundle savedInstanceState);

}
</span>
           

子類：

<span style="font-size:14px;">package com.heima.news.fragment;



public class HomeFragment extends BaseFragment {
	

	@Override
	public View initView(LayoutInflater inflater) {
		view = inflater.inflate(R.layout.frag_home2, null);
<span style="white-space:pre">		</span>.......
		return view;
	}

	List<BasePage> list = new ArrayList<BasePage>();;

	@Override
	public void initData(Bundle savedInstanceState) {
		
		.......
	}

}
</span>
           

子類實作了父類的抽象方法，省去了每次需要Override那幾個生命周期方法，代碼看起來更簡潔。

新聞項目的下載下傳連結：http://download.csdn.net/detail/yersterday/7900977

（需要說明的是代碼隻含有導航功能，沒有具體子產品的實作）。

下面Activity基類的代碼是另一個項目的：

package com.immomo.momo.android;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Toast;

import com.immomo.momo.android.dialog.FlippingLoadingDialog;
import com.immomo.momo.android.util.NetWorkUtils;
import com.immomo.momo.android.view.HandyTextView;

public abstract class BaseActivity extends FragmentActivity {
//	protected BaseApplication mApplication;
//	protected NetWorkUtils mNetWorkUtils;
//	protected FlippingLoadingDialog mLoadingDialog;

	/**
	 * 螢幕的寬度、高度、密度
	 */
	protected int mScreenWidth;
	protected int mScreenHeight;
	protected float mDensity;

	protected List<AsyncTask<Void, Void, Boolean>> mAsyncTasks = new ArrayList<AsyncTask<Void, Void, Boolean>>();

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
//		mApplication = (BaseApplication) getApplication();
//		mNetWorkUtils = new NetWorkUtils(this);
//		mLoadingDialog = new FlippingLoadingDialog(this, "請求送出中");

		DisplayMetrics metric = new DisplayMetrics();
		getWindowManager().getDefaultDisplay().getMetrics(metric);
		mScreenWidth = metric.widthPixels;
		mScreenHeight = metric.heightPixels;
		mDensity = metric.density;
	}

	@Override
	protected void onDestroy() {
		clearAsyncTask();
		super.onDestroy();
	}

	/** 初始化視圖 **/
	protected abstract void initViews();

	/** 初始化事件 **/
	protected abstract void initEvents();

	protected void putAsyncTask(AsyncTask<Void, Void, Boolean> asyncTask) {
		mAsyncTasks.add(asyncTask.execute());
	}

	protected void clearAsyncTask() {
		Iterator<AsyncTask<Void, Void, Boolean>> iterator = mAsyncTasks
				.iterator();
		while (iterator.hasNext()) {
			AsyncTask<Void, Void, Boolean> asyncTask = iterator.next();
			if (asyncTask != null && !asyncTask.isCancelled()) {
				asyncTask.cancel(true);
			}
		}
		mAsyncTasks.clear();
	}

//	protected void showLoadingDialog(String text) {
//		if (text != null) {
//			mLoadingDialog.setText(text);
//		}
//		mLoadingDialog.show();
//	}

//	protected void dismissLoadingDialog() {
//		if (mLoadingDialog.isShowing()) {
//			mLoadingDialog.dismiss();
//		}
//	}

	/** 短暫顯示Toast提示(來自res) **/
	protected void showShortToast(int resId) {
		Toast.makeText(this, getString(resId), Toast.LENGTH_SHORT).show();
	}

	/** 短暫顯示Toast提示(來自String) **/
	protected void showShortToast(String text) {
		Toast.makeText(this, text, Toast.LENGTH_SHORT).show();
	}

	/** 長時間顯示Toast提示(來自res) **/
	protected void showLongToast(int resId) {
		Toast.makeText(this, getString(resId), Toast.LENGTH_LONG).show();
	}

	/** 長時間顯示Toast提示(來自String) **/
	protected void showLongToast(String text) {
		Toast.makeText(this, text, Toast.LENGTH_LONG).show();
	}

	/** 顯示自定義Toast提示(來自res) **/
	protected void showCustomToast(int resId) {
		View toastRoot = LayoutInflater.from(BaseActivity.this).inflate(
				R.layout.common_toast, null);
		((HandyTextView) toastRoot.findViewById(R.id.toast_text))
				.setText(getString(resId));
		Toast toast = new Toast(BaseActivity.this);
		toast.setGravity(Gravity.CENTER, 0, 0);
		toast.setDuration(Toast.LENGTH_SHORT);
		toast.setView(toastRoot);
		toast.show();
	}

	/** 顯示自定義Toast提示(來自String) **/
	protected void showCustomToast(String text) {
		View toastRoot = LayoutInflater.from(BaseActivity.this).inflate(
				R.layout.common_toast, null);
		((HandyTextView) toastRoot.findViewById(R.id.toast_text)).setText(text);
		Toast toast = new Toast(BaseActivity.this);
		toast.setGravity(Gravity.CENTER, 0, 0);
		toast.setDuration(Toast.LENGTH_SHORT);
		toast.setView(toastRoot);
		toast.show();
	}

	/** Debug輸出Log日志 **/
	protected void showLogDebug(String tag, String msg) {
		Log.d(tag, msg);
	}

	/** Error輸出Log日志 **/
	protected void showLogError(String tag, String msg) {
		Log.e(tag, msg);
	}

	/** 通過Class跳轉界面 **/
	protected void startActivity(Class<?> cls) {
		startActivity(cls, null);
	}

	/** 含有Bundle通過Class跳轉界面 **/
	protected void startActivity(Class<?> cls, Bundle bundle) {
		Intent intent = new Intent();
		intent.setClass(this, cls);
		if (bundle != null) {
			intent.putExtras(bundle);
		}
		startActivity(intent);
	}

	/** 通過Action跳轉界面 **/
	protected void startActivity(String action) {
		startActivity(action, null);
	}

	/** 含有Bundle通過Action跳轉界面 **/
	protected void startActivity(String action, Bundle bundle) {
		Intent intent = new Intent();
		intent.setAction(action);
		if (bundle != null) {
			intent.putExtras(bundle);
		}
		startActivity(intent);
	}

	/** 含有标題和内容的對話框 **/
	protected AlertDialog showAlertDialog(String title, String message) {
		AlertDialog alertDialog = new AlertDialog.Builder(this).setTitle(title)
				.setMessage(message).show();
		return alertDialog;
	}

	/** 含有标題、内容、兩個按鈕的對話框 **/
	protected AlertDialog showAlertDialog(String title, String message,
			String positiveText,
			DialogInterface.OnClickListener onPositiveClickListener,
			String negativeText,
			DialogInterface.OnClickListener onNegativeClickListener) {
		AlertDialog alertDialog = new AlertDialog.Builder(this).setTitle(title)
				.setMessage(message)
				.setPositiveButton(positiveText, onPositiveClickListener)
				.setNegativeButton(negativeText, onNegativeClickListener)
				.show();
		return alertDialog;
	}

	/** 含有标題、内容、圖示、兩個按鈕的對話框 **/
	protected AlertDialog showAlertDialog(String title, String message,
			int icon, String positiveText,
			DialogInterface.OnClickListener onPositiveClickListener,
			String negativeText,
			DialogInterface.OnClickListener onNegativeClickListener) {
		AlertDialog alertDialog = new AlertDialog.Builder(this).setTitle(title)
				.setMessage(message).setIcon(icon)
				.setPositiveButton(positiveText, onPositiveClickListener)
				.setNegativeButton(negativeText, onNegativeClickListener)
				.show();
		return alertDialog;
	}

	/** 預設退出 **/
	protected void defaultFinish() {
		super.finish();
	}
}