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   源码介绍

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微信分享流程：

1.申请你的AppID，申请地址：https://open.weixin.qq.com

2.下载微信终端开发工具包

3.搭建开发环境

4.实例中需要用到申请到的AppID，等审核通过之后 测试就正常了， 很多人 activity 忘记 implements IWXAPIEventHandler 这是常犯的错误

package net.sourceforge.simcpux.wxapi;


import com.tencent.mm.sdk.openapi.BaseReq;
import com.tencent.mm.sdk.openapi.BaseResp;
import com.tencent.mm.sdk.openapi.ConstantsAPI;
import com.tencent.mm.sdk.openapi.ShowMessageFromWX;
import com.tencent.mm.sdk.openapi.IWXAPI;
import com.tencent.mm.sdk.openapi.IWXAPIEventHandler;
import com.tencent.mm.sdk.openapi.WXAPIFactory;
import com.tencent.mm.sdk.openapi.WXAppExtendObject;
import com.tencent.mm.sdk.openapi.WXMediaMessage;

import net.sourceforge.simcpux.Constants;
import net.sourceforge.simcpux.GetFromWXActivity;
import net.sourceforge.simcpux.SendToWXActivity;
import net.sourceforge.simcpux.ShowFromWXActivity;
import net.sourceforge.simcpux.R;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class WXEntryActivity extends Activity implements IWXAPIEventHandler{
	
	private static final int TIMELINE_SUPPORTED_VERSION = 0x21020001;
	
	private Button gotoBtn, regBtn, launchBtn, checkBtn;
	
	// IWXAPI 是第三方app和微信通信的openapi接口
    private IWXAPI api;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.entry);
        
        // 通过WXAPIFactory工厂，获取IWXAPI的实例
    	api = WXAPIFactory.createWXAPI(this, Constants.APP_ID, false);

    	regBtn = (Button) findViewById(R.id.reg_btn);
    	regBtn.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// 将该app注册到微信
			    api.registerApp(Constants.APP_ID);    	
			}
		});
    	
        gotoBtn = (Button) findViewById(R.id.goto_send_btn);
        gotoBtn.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
		        startActivity(new Intent(WXEntryActivity.this, SendToWXActivity.class));
		        finish();
			}
		});
        
        launchBtn = (Button) findViewById(R.id.launch_wx_btn);
        launchBtn.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				Toast.makeText(WXEntryActivity.this, "launch result = "   api.openWXApp(), Toast.LENGTH_LONG).show();
			}
		});
        
        checkBtn = (Button) findViewById(R.id.check_timeline_supported_btn);
        checkBtn.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				int wxSdkVersion = api.getWXAppSupportAPI();
				if (wxSdkVersion >= TIMELINE_SUPPORTED_VERSION) {
					Toast.makeText(WXEntryActivity.this, "wxSdkVersion = "   Integer.toHexString(wxSdkVersion)   "\ntimeline supported", Toast.LENGTH_LONG).show();
				} else {
					Toast.makeText(WXEntryActivity.this, "wxSdkVersion = "   Integer.toHexString(wxSdkVersion)   "\ntimeline not supported", Toast.LENGTH_LONG).show();
				}
			}
		});
        
        api.handleIntent(getIntent(), this);
    }

	@Override
	protected void onNewIntent(Intent intent) {
		super.onNewIntent(intent);
		
		setIntent(intent);
        api.handleIntent(intent, this);
	}

	// 微信发送请求到第三方应用时，会回调到该方法
	@Override
	public void onReq(BaseReq req) {
		switch (req.getType()) {
		case ConstantsAPI.COMMAND_GETMESSAGE_FROM_WX:
			goToGetMsg();		
			break;
		case ConstantsAPI.COMMAND_SHOWMESSAGE_FROM_WX:
			goToShowMsg((ShowMessageFromWX.Req) req);
			break;
		default:
			break;
		}
	}

	// 第三方应用发送到微信的请求处理后的响应结果，会回调到该方法
	@Override
	public void onResp(BaseResp resp) {
		int result = 0;
		
		switch (resp.errCode) {
		case BaseResp.ErrCode.ERR_OK:
			result = R.string.errcode_success;
			break;
		case BaseResp.ErrCode.ERR_USER_CANCEL:
			result = R.string.errcode_cancel;
			break;
		case BaseResp.ErrCode.ERR_AUTH_DENIED:
			result = R.string.errcode_deny;
			break;
		default:
			result = R.string.errcode_unknown;
			break;
		}
		
		Toast.makeText(this, result, Toast.LENGTH_LONG).show();
	}
	
	private void goToGetMsg() {
		Intent intent = new Intent(this, GetFromWXActivity.class);
		intent.putExtras(getIntent());
		startActivity(intent);
		finish();
	}
	
	private void goToShowMsg(ShowMessageFromWX.Req showReq) {
		WXMediaMessage wxMsg = showReq.message;		
		WXAppExtendObject obj = (WXAppExtendObject) wxMsg.mediaObject;
		
		StringBuffer msg = new StringBuffer(); // 组织一个待显示的消息内容
		msg.append("description: ");
		msg.append(wxMsg.description);
		msg.append("\n");
		msg.append("extInfo: ");
		msg.append(obj.extInfo);
		msg.append("\n");
		msg.append("filePath: ");
		msg.append(obj.filePath);
		
		Intent intent = new Intent(this, ShowFromWXActivity.class);
		intent.putExtra(Constants.ShowMsgActivity.STitle, wxMsg.title);
		intent.putExtra(Constants.ShowMsgActivity.SMessage, msg.toString());
		intent.putExtra(Constants.ShowMsgActivity.BAThumbData, wxMsg.thumbData);
		startActivity(intent);
		finish();
	}
}