今天看到论坛上有人问这个。估计是要搞一个类似下载软件的东西吧。
所以就有了本篇，原理：
处理线程先给handler发消息，消息中包括进度信息，handler在去更改List的Adapter里面的信息，并通知List更新UI。
原理很简单，就直接上码了：
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package hol.test.listprogress;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import android.app.Activity;
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import android.content.Context;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Message;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.BaseAdapter;
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import android.widget.Button;
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import android.widget.ListView;
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import android.widget.ProgressBar;
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import android.widget.TextView;
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public class TestListProgress extends Activity {
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private Button testDo = null;
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private ListView progressList = null;
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private List<HashMap<String, Object>> list;
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private MyAdapter myAdapet;
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private MyHandler myHandler;
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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myHandler = new MyHandler();
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findView();
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addListerner();
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initList();
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}
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private void findView() {
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testDo = (Button) findViewById(R.id.btn_test);
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progressList = (ListView) findViewById(R.id.lst_progress);
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}
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private void addListerner() {
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testDo.setOnClickListener(new ClickEvent());
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}
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private void initList() {
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list = new ArrayList<HashMap<String, Object>>();
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HashMap<String, Object> dataA = new HashMap<String, Object>();
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HashMap<String, Object> dataB = new HashMap<String, Object>();
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dataA.put("title", "dataA");
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dataA.put("current", 0);
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list.add(dataA);
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dataB.put("title", "dataB");
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dataB.put("current", 0);
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list.add(dataB);
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myAdapet = new MyAdapter(TestListProgress.this, list);
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progressList.setAdapter(myAdapet);
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}
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// 模拟处理线程
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class UpdateRunnable implements Runnable {
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int id;
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int currentPos = 0;
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int delay;
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MyHandler handler;
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public UpdateRunnable(int id, int delay, MyHandler handler) {
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this.id = id;
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this.handler = handler;
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this.delay = delay;
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}
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@Override
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public void run() {
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// TODO Auto-generated method stub
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while (currentPos <= 100) {
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Message msg = handler.obtainMessage();
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msg.what = 1;
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msg.arg1 = id;
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msg.arg2 = currentPos;
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currentPos = currentPos + 5;
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msg.sendToTarget();
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try {
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Thread.sleep(delay);
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} catch (InterruptedException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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}
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}
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// 消息Handler用来更新UI
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class MyHandler extends Handler {
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@Override
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public void handleMessage(Message msg) {
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// TODO Auto-generated method stub
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switch (msg.what) {
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case 1:
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int id = msg.arg1;
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int current = msg.arg2;
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updateProgress(id, current);
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break;
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}
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super.handleMessage(msg);
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}
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private void updateProgress(int id, int currentPos) {
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HashMap<String, Object> dataTemp = list.get(id);
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dataTemp.put("current", currentPos);
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myAdapet.chargeProgress(id, dataTemp);
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}
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}
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// 按钮事件
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class ClickEvent implements View.OnClickListener {
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@Override
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public void onClick(View v) {
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// TODO Auto-generated method stub
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switch (v.getId()) {
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case (R.id.btn_test):
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new Thread(new UpdateRunnable(0, 400, myHandler)).start();
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new Thread(new UpdateRunnable(1, 200, myHandler)).start();
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System.out.println("OnClick");
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break;
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}
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}
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}
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// List的显示
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class MyAdapter extends BaseAdapter {
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List<HashMap<String, Object>> list;
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LayoutInflater infl = null;
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public MyAdapter(Context context, List<HashMap<String, Object>> list) {
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this.infl = (LayoutInflater) context
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.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
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this.list = list;
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}
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@Override
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public int getCount() {
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// TODO Auto-generated method stub
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return list.size();
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}
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@Override
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public Object getItem(int position) {
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// TODO Auto-generated method stub
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return list.get(position);
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}
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@Override
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public long getItemId(int position) {
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// TODO Auto-generated method stub
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return position;
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}
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@Override
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public View getView(int position, View convertView, ViewGroup parent) {
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// TODO Auto-generated method stub
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convertView = infl.inflate(R.layout.list_layout, null);
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ProgressBar progressBar = (ProgressBar) convertView
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.findViewById(R.id.progress);
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TextView titleView = (TextView) convertView
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.findViewById(R.id.title);
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HashMap<String, Object> detail = list.get(position);
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String t = (String) detail.get("title");
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titleView.setText(t);
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int progress = (Integer) detail.get("current");
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progressBar.setProgress(progress);
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return convertView;
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}
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// 改变进度，postion就是要改的那个进度
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public void chargeProgress(int postion, HashMap<String, Object> detail) {
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this.list.set(postion, detail);
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// System.out.println("charged:" + detail.get("current"));
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notifyDataSetChanged();
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}
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}
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} |
MyAdapet 里面的 chargeProgress是在用来更新List里面的值。 |
Message里面arg1就是List中的第几个进度条，arg2就是这个进度条里面的当前应该有的进度。what暂时没什么意义，只是为了标识这类消息是用来更新进度条的。本例也只有这一类消息。 |
这个是List的LayoutXML文件内容： |
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<LinearLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="horizontal"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent">
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<TextView android:id="@+id/title"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="In list"
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android:layout_marginRight="5dip"
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>
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</TextView>
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<ProgressBar android:id="@+id/progress"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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style="?android:attr/progressBarStyleHorizontal"
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android:max="100"
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android:layout_weight="1.0"
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android:visibility="visible"
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/>
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</LinearLayout>
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Acitvity的布局： |
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="vertical"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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>
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<TextView |
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android:layout_width="fill_parent" |
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android:layout_height="wrap_content" |
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android:text="@string/hello"
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/>
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<Button android:id="@+id/btn_test"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:text="ListProgress"
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/>
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<ListView android:id="@+id/lst_progress"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:layout_weight="1.0"
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>
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</ListView>
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</LinearLayout> |
效果图如下： |
转载于:https://www.cnblogs.com/jdsjlzx/archive/2011/08/01/2123974.html