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 ;@Overridepublic 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 stubpd.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 blocke.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;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.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);}@Overrideprotected 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

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