问题描述
hi 问几个问题1. 如果在ProgressBar上显示数字,是否原生支持2. 我有个下载的业务 在一个Activity中点下载的同时可以在另外一个Activity中显示现在进度:我直接诶在Activity中new Thread来作的,这样好不好的,一般时用什么方法作? 这样性能是否过得去看我红色标题部分，我是通过Thread while true, 3. 我在已下载完毕的文件图标上放个勾勾,这个是图片合成作的,还是用android提供的工具做的?/** * */package com.alibaba.cloudspace;import java.util.ArrayList;import java.util.List;import android.app.TabActivity;import android.content.Intent;import android.graphics.Color;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.GestureDetector;import android.view.Gravity;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.MotionEvent;import android.widget.ListView;import android.widget.TabHost;import android.widget.TextView;import android.widget.TabHost.OnTabChangeListener;public class TransStatusActivity extends TabActivity implements OnTabChangeListener { private GestureDetector gestureDetector; private UpdateProgressBarHandler progressBarHandler; private UpdateDownloadFilesHandler downloadFilesHandler; private ProgressBarListAdapter adapter = null; private DownloadCompleteListAdapter downloadCompleteAdapter = null; private ListView listView = null; private ListView listView2 = null; private TabHost transTabhost; private final String[] TAB_IDS = new String[] { "TRANS_TAB1", "TRANS_TAB2" }; private static FileMap DOWNLOAD_FILES = new FileMap(); private String email = ""; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // TODO Get email. // email = getIntent().getExtras().getString(""); gestureDetector = new GestureDetector(this, new CLGestureDetector(this)); transTabhost = this.getTabHost(); LayoutInflater.from(this).inflate(R.layout.trans_status, transTabhost.getTabContentView(), true); transTabhost.addTab(transTabhost.newTabSpec(TAB_IDS[0]).setIndicator( createTabTextView(R.string.app_text_transfer)).setContent(R.id.transfer_tab)); transTabhost.addTab(transTabhost.newTabSpec(TAB_IDS[1]).setIndicator( createTabTextView(R.string.app_text_transfer_finish)).setContent( R.id.transfer_finish_tab)); // TODO 载入未完成的下载列表 progressBarHandler = new UpdateProgressBarHandler(); downloadFilesHandler = new UpdateDownloadFilesHandler(); adapter = new ProgressBarListAdapter(this, getTransStatusList()); listView = (ListView) findViewById(R.id.trans_status_list); listView.setAdapter(adapter); [color=red][b] new UpdateProgressBarThread().start(); new UpdateDownloadFileListThread().start();[/b][/color] downloadCompleteAdapter = new DownloadCompleteListAdapter(this, DOWNLOAD_FILES.get(email)); listView2 = (ListView) findViewById(R.id.download_complete_list); listView2.setAdapter(downloadCompleteAdapter); transTabhost.setOnTabChangedListener(this); }。。。。 private List<TransStatus> getTransStatusList() { List<TransStatus> transStatus = new ArrayList<TransStatus>(); for (int i = 0; i < FileListActivity.downloading.size(); i++) { FileDownloaderTask t = FileListActivity.downloading.get(i); if (t.isCompleted()) { DOWNLOAD_FILES.add(email, t.getFile()); downloadFilesHandler.sendMessage(new Message()); FileListActivity.downloading.remove(i--); continue; } TransStatus s = new TransStatus(); s.setFid(t.getFile().getNodeId()); s.setTitle(t.getFile().getFileName()); s.setPercent(t.getPercent()); Log.d("DEBUG-TRANS-STATUS", "Percent:" + s.getPercent() + ", has read:" + t.getHasReadSize() + ", full size:" + t.getFile().getFullSize()); transStatus.add(s); } return transStatus; } class UpdateProgressBarThread extends Thread { public void run() { while (true) { Message msg = new Message(); try { Thread.sleep(100); } catch (InterruptedException e) { } progressBarHandler.sendMessage(msg); int i = 0; for (FileDownloaderTask f : FileListActivity.downloading) { if (f.isCompleted()) i++; } Log.e("", "Completed:" + i + ", downloading size:" + FileListActivity.downloading.size()); if (i >= FileListActivity.downloading.size()) break; } }; } class UpdateDownloadFileListThread extends Thread { public void run() { Message msg = new Message(); try { Thread.sleep(100); } catch (InterruptedException e) { } downloadFilesHandler.sendMessage(msg); }; } class UpdateProgressBarHandler extends Handler { @Override public void handleMessage(Message msg) { adapter = new ProgressBarListAdapter(TransStatusActivity.this, getTransStatusList()); listView = (ListView) findViewById(R.id.trans_status_list); listView.setAdapter(adapter); } } class UpdateDownloadFilesHandler extends Handler { @Override public void handleMessage(Message msg) { downloadCompleteAdapter = new DownloadCompleteListAdapter(TransStatusActivity.this, DOWNLOAD_FILES.get(email)); listView2 = (ListView) findViewById(R.id.download_complete_list); listView2.setAdapter(downloadCompleteAdapter); } } @Override public void onTabChanged(String tabId) { } private TextView createTabTextView(int rid) { TextView txtTabInfo = new TextView(this); txtTabInfo.setText(getResources().getString(rid)); txtTabInfo.setPadding(0, 5, 0, 0); txtTabInfo.setTextSize(11); txtTabInfo.setBackgroundResource(R.drawable.tab_normal); txtTabInfo.setTextColor(Color.DKGRAY); txtTabInfo.setGravity(Gravity.CENTER); txtTabInfo.setHeight(39); return txtTabInfo; }}
解决方案
1. Progress Bar 是不带数字显示的2. 最好不要直接使用 new Thread 来完成下载，建议你使用 AsyncTask 去实现3. 没看到你的效果图，不知道你是指什么？但是我觉得应该是这样的：文件正在下载时，你显示的是一个图标，而当文件下载完成时，用另外一个图标来代替之前的图标