2010.12.08——— android progressDialog

2010.12.08——— android progressDialog

有时候 数据加载慢了 需要提示用户正在加载数据 这样有利于提高用户体验

例如

package com.huitu.project;

import java.util.*;

import com.huitu.pojo.GCXX2;
import com.huitu.pojo.GC_GCXZ;
import com.huitu.pojo.GC_RGNCD;
import com.huitu.service.GCXXService;
import com.huitu.service.QueryService;

import com.huitu.util.JSONUtil;

import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemClickListener;

public class GCXXActivity extends Activity {

	private Spinner sp_xzqh;
	private Spinner sp_jsxz;

	private Spinner sp_sgzt;
	private Spinner sp_sfyz;
	private Spinner sp_pxtj;
	private ImageButton bt_tianjian;
	private ListView listView;
	// 查询条件
	private String sgztid = null;
	private String sfyzid = null;
	private String tiaojian = null;
	private String xzdq = null;
	private String jsxz = null;
	private String gcmc = null;
	private String sgxkzh = null;
	private String jsdw = null;
	
	private String flat;
	
	private ProgressDialog pd;
	private Handler mProgressHandler;
	private SimpleAdapter adapter;
	private MyThread mt ;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.gcxx);
		
		pd = new ProgressDialog(this);
		pd.setIndeterminate(true);
		pd.setMessage("加载数据...");
		pd.setCancelable(true);
		mProgressHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
            	int length = msg.getData().getInt("length");
            	switch (length){
            	case 1 :
            		pd.dismiss();
            		break;
            	case 2 :
            		listView.setAdapter(adapter);
        		listView.setOnItemClickListener(new ItemClickListen());
        		break;
            	}
            	
            }
        };
		

		sp_xzqh.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {
			
			public void onItemSelected(AdapterView<?> arg0, View arg1,
					int arg2, long arg3) {
				// TODO Auto-generated method stub
				pd.show();
				GC_RGNCD rgncd = (GC_RGNCD) sp_xzqh.getSelectedItem();
				xzdq = rgncd.getRGNCD();
				mt = new MyThread();
				mt.start();
			}

		});


	private void init(String xzdq, String jsxz, String gcmc, String jsdw,
			String sfyzid, String sgztid, String sgxkzh) {
		try {
			String json = GCXXService.query(xzdq, jsxz, gcmc, jsdw, sfyzid,
					sgztid, sgxkzh);
			System.out.println(json);
			
			List<GCXX2> list = JSONUtil.parseJSON_GCXX2_list(json);
			List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
			// String[]sta={"无证","有证"};
			// String s;
			for (GCXX2 bean : list) {
				HashMap<String, Object> item = new HashMap<String, Object>();
				item.put("RN", bean.getRowId());
				item.put("GCMC", bean.getXMMC());
				item.put("JSDWMC", bean.getJSDWMC());
				item.put("GCZT_NAME", bean.getGCZT_NAME());
				item.put("STATUES", bean.getSTATUES());
				item.put("GCXZ", bean.getGCXZNAME());
				
				item.put("GCBM", bean.getGCBM());

				data.add(item);
			}
			adapter = new SimpleAdapter(GCXXActivity.this, data,
					R.layout.gcxxitem, new String[] { "RN", "GCMC", "JSDWMC",
							"GCZT_NAME",  "GCXZ" }, new int[] {
							R.id.gcxx_rn, R.id.gcmc, R.id.jsdw, R.id.gczt,
							 R.id.jsxz });
			// ll.setVisibility(View.VISIBLE);
			listView = (ListView) findViewById(R.id.listview);
			
			Message msg = new Message();
			msg.getData().putInt("length", 2);
			mProgressHandler.sendMessage(msg);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	



	private final class ItemClickListen implements OnItemClickListener{
		
		public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
			 ListView lv = (ListView)parent;
			 HashMap<String, Object> map = (HashMap<String, Object>)lv.getItemAtPosition(position);
			 String GCBM = map.get("GCBM").toString();
			 Intent intent = null;
			 if(flat.equals("0")){
				 intent = new Intent(GCXXActivity.this,XZJLListActivity.class);
			 }else{
				 intent = new Intent(GCXXActivity.this,XZJL_UploadActivity.class);
			 }
			 Bundle bundle = new Bundle();
			 bundle.putString("GCBM", GCBM);
			 intent.putExtras(bundle);
			 startActivity(intent);
		}    	
    }



	private class MyThread extends Thread {
		
		public void run(){
			init( xzdq,  jsxz,  gcmc,  jsdw,
					 sfyzid,  sgztid,  sgxkzh);
			Message msg = new Message();
			msg.getData().putInt("length", 1);
			mProgressHandler.sendMessage(msg);
		}
	}
}

在新线程里面加载数据 然后通过Handler来更新主线程的UI 这里 进度条 和 ListView都需要更新


另外 在用的时候 有时候我是直接通过WebView加载的网页 也需要 用到进度条

package com.huitu.project;


import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class GC_JBXXActivity extends Activity {
	
	private ImageView iv;
	private TextView tv_gcmc;
	private Button bn_gis;
	private Button bn_dtxx;
	private Button bn_baxx;
	private WebView wv;
	private String GCBM;
	private ProgressDialog pd;
	private Handler mProgressHandler;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.gc_jbxx);
		
		pd = new ProgressDialog(this);
		pd.setIndeterminate(true);
		pd.setMessage("加载数据...");
		pd.setCancelable(true);
		
		mProgressHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
            	int length = msg.getData().getInt("length");
            	switch (length){
            	case 1 :
            		pd.dismiss();
            		break;
            	}
            	
            }
        };
		wv = (WebView)findViewById(R.id.webView);
		wv.getSettings().setJavaScriptEnabled(true);
		
	}
	

	@Override
	protected void onResume() {
		super.onResume();
		pd.show();
		new Thread(){
			public void run(){
				wv.loadUrl("http://10.169.53.126:8080/CPJW_2/android_queryGCXXByGCBM.action?GCBM="+GCBM);
				Message msg = new Message();
				msg.getData().putInt("length", 1);
				mProgressHandler.sendMessage(msg);
			}
		}.start();
	}
	

	
	

}

刚开始 我就是这样写的

new Thread(){
			public void run(){
				wv.loadUrl("http://10.169.53.126:8080/CPJW_2/android_queryGCXXByGCBM.action?GCBM="+GCBM);
				Message msg = new Message();
				msg.getData().putInt("length", 1);
				mProgressHandler.sendMessage(msg);
			}
		}.start();

但是 页面还没有加载完 进度条 就直接消失了
也就是 说 他是顺序执行的 加载页面时一个异步的过程  很是 郁闷

后来查了一下api  需要 WebChromeClient 这个类

wv.setWebChromeClient(new WebChromeClient(){
			public void onProgressChanged(WebView view,int progress){
				if(progress==100){
					Message msg = new Message();
					msg.getData().putInt("length", 1);
					mProgressHandler.sendMessage(msg);
				}
			}
		});	

这样设置一下 progress值从0-100 100 就代表加载完成

然后

new Thread(){
			public void run(){
				wv.loadUrl("http://10.169.53.126:8080/CPJW_2/android_queryGCXXByGCBM.action?GCBM="+GCBM);
			}
		}.start();

这样 就ok了