RenrenDialog.java

/*
 * Copyright 2010 Renren, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.renren.api.connect.android.view;

import org.apache.http.util.EncodingUtils;

import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.ViewGroup;
import android.view.Window;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.renren.api.connect.android.R;
import com.renren.api.connect.android.Renren;

/**
 * 把人人请求结果用Dialog形式显示给用户（如登录界面）。开发者不会直接使用该类。
 * 
 * @author yong.li@opi-corp.com
 * 
 */
public class RenrenDialog extends Dialog {

	private static final String LOG_TAG = "RenrenDialog";

	private static final int RENREN_BLUE = 0xFF005EAC;

	private static final float[] DIMENSIONS_LANDSCAPE = { 460, 260 };

	private static final float[] DIMENSIONS_PORTRAIT = { 280, 420 };

	/**
	 * 验证过程被取消的错误码
	 */
	private static final String CODE_AUTH_CANCEL = "login_denied";

	protected String mUrl;

	protected RenrenDialogListener mListener;

	private ProgressDialog progress;

	protected WebView webView;

	private LinearLayout content;

	private TextView title;

	private boolean showTitle = false;
	
	private String mPostData;
	private boolean isPost = false;

	public RenrenDialog(Context context, String url,
			RenrenDialogListener listener) {
		this(context, url, listener, false);
	}
	/**
	 * 用post方法发起请求。
	 * @param context
	 * @param url
	 * @param postDatas post的参数
	 * @param listener
	 */
	public RenrenDialog(Context context, String url, String postDatas,
			RenrenDialogListener listener) {
		this(context, url, listener);
		mPostData = postDatas;
		isPost = true;
	}
	public RenrenDialog(Context context, String url,
			RenrenDialogListener listener, boolean showTitle) {
		super(context);
		mUrl = url;
		mListener = listener;
		this.showTitle = showTitle;
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		progress = new ProgressDialog(getContext());
		progress.requestWindowFeature(Window.FEATURE_NO_TITLE);
		progress.setMessage("Loading...");

		content = new LinearLayout(getContext());
		content.setOrientation(LinearLayout.VERTICAL);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		if (this.showTitle) {
			setUpTitle();
		}
		setUpWebView();

		Display display = getWindow().getWindowManager().getDefaultDisplay();
		float scale = getContext().getResources().getDisplayMetrics().density;
		float[] dimensions = display.getWidth() < display.getHeight() ? DIMENSIONS_PORTRAIT
				: DIMENSIONS_LANDSCAPE;
		addContentView(content, new FrameLayout.LayoutParams(
				(int) (dimensions[0] * scale + 0.5f), (int) (dimensions[1]
						* scale + 0.5f)));
	}

	private void setUpTitle() {
		Drawable icon = getContext().getResources().getDrawable(
				R.drawable.renren_sdk_android_title_logo);
		title = new TextView(getContext());
		title.setText("与人人连接");
		title.setTextColor(Color.WHITE);
		title.setGravity(Gravity.CENTER_VERTICAL);
		title.setTypeface(Typeface.DEFAULT_BOLD);
		title.setBackgroundColor(RENREN_BLUE);
		title.setBackgroundResource(R.drawable.renren_sdk_android_title_bg);
		title.setCompoundDrawablePadding(6);
		title.setCompoundDrawablesWithIntrinsicBounds(icon, null, null, null);
		content.addView(title);
	}
	private void setUpWebView() {
		webView = new WebView(getContext());
		webView.setVerticalScrollBarEnabled(false);
		webView.setHorizontalScrollBarEnabled(false);
		webView.getSettings().setJavaScriptEnabled(true);
		webView.setWebViewClient(new RenrenDialog.RenrenWebViewClient());
		if (isPost) {
			webView.postUrl(mUrl, EncodingUtils.getBytes(mPostData, "BASE64"));
		} else {
			webView.loadUrl(mUrl);
		}
		FrameLayout.LayoutParams fill = new FrameLayout.LayoutParams(
				ViewGroup.LayoutParams.FILL_PARENT,
				ViewGroup.LayoutParams.FILL_PARENT);
		webView.setLayoutParams(fill);
		content.addView(webView);
	}

	/**
	 * Reponse on the Back key click to close the authrization dialog and send
	 * back the Cancel message Added by Shaofeng Wang
	 * (shaofeng.wang@renren-inc.com)
	 */
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			if (webView != null) {
				webView.stopLoading();
			}
			if (progress != null) {
				progress.dismiss();
			}
			RenrenDialog.this.dismiss();
			mListener.onPageBegin(Renren.DEFAULT_REDIRECT_URI + "?error="
					+ CODE_AUTH_CANCEL);
			this.cancel();
		}
		return super.onKeyDown(keyCode, event);
	}

	private class RenrenWebViewClient extends WebViewClient {

		@Override
		public boolean shouldOverrideUrlLoading(WebView view, String url) {
			Log.d(LOG_TAG, "Redirect URL: " + url);
			int b = mListener.onPageBegin(url);
			switch (b) {
			case RenrenDialogListener.ACTION_PROCCESSED:
				RenrenDialog.this.dismiss();
				return true;
			case RenrenDialogListener.ACTION_DIALOG_PROCCESS:
				return false;
			}
			getContext().startActivity(
					new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
			return true;
		}

		@Override
		public void onPageStarted(WebView view, String url, Bitmap favicon) {
			Log.d(LOG_TAG, "Webview loading URL: " + url);
			boolean b = mListener.onPageStart(url);
			if (b) {
				view.stopLoading();
				RenrenDialog.this.dismiss();
				return;
			}
			super.onPageStarted(view, url, favicon);
			progress.show();
		}

		@Override
		public void onReceivedError(WebView view, int errorCode,
				String description, String failingUrl) {
			super.onReceivedError(view, errorCode, description, failingUrl);
			mListener.onReceivedError(errorCode, description, failingUrl);
			progress.hide();
			RenrenDialog.this.dismiss();
		}

		@Override
		public void onPageFinished(WebView view, String url) {
			super.onPageFinished(view, url);
			mListener.onPageFinished(url);
			if (showTitle) {
				String t = view.getTitle();
				if (t != null && t.length() > 0) {
					title.setText(t);
				}
			}
			progress.hide();
		}
	}

	@Override
	protected void onStop() {
		super.onStop();
		if (progress != null) {
			progress.dismiss();
		}
	}
	
	
}