============问题描述============
我想让下面的mythread中的循环执行完毕之后再在主线程里给messageList设置Adapter。Thread myThread = new Thread(new Runnable() { @Override public void run() { try { Map map1 = new HashMap (); map1.put("", ""); String retStr = ""; retStr = NetTool.sendGetRequest(messageShowUrl, map1, "utf-8"); String[] str = retStr.split(","); list = Arrays.asList(str); listAll.clear(); for (int i = 0; i < str.length / 5; i++) { Map map2 = new HashMap (); map2.put("user_name", list.get(i * 5)); map2.put("object_words", list.get(i * 5 + 1)); map2.put("my_words", list.get(i * 5 + 2)); map2.put("date", list.get(i * 5 + 4)); // 如果用户没有传照片，map2中传的imageUrl就为空 System.out.println("list3 = " + list.get(i * 5 + 3)); if (!list.get(i * 5 + 3).equals(" ")) { String imageUrl1 = "http://10.0.2.2:8080/BBStuServlet/" + list.get(i * 5 + 3); String imageUrl = imageUrl1.replace(" ", ""); map2.put("imageUrl", imageUrl); } else { map2.put("imageUrl", ""); } listAll.add(map2); } } catch (Exception e) { e.printStackTrace(); } } }); myThread.start(); MyAdapter adapter = new MyAdapter(this); messageList.setAdapter(adapter); 于是我改成了下面的形式： Thread myThread = new Thread(new Runnable() { @Override public void run() { try { Map map1 = new HashMap (); map1.put("", ""); String retStr = ""; retStr = NetTool.sendGetRequest(messageShowUrl, map1, "utf-8"); String[] str = retStr.split(","); list = Arrays.asList(str); listAll.clear(); synchronized (this) { for (int i = 0; i < str.length / 5; i++) { Map map2 = new HashMap (); map2.put("user_name", list.get(i * 5)); map2.put("object_words", list.get(i * 5 + 1)); map2.put("my_words", list.get(i * 5 + 2)); map2.put("date", list.get(i * 5 + 4)); // 如果用户没有传照片，map2中传的imageUrl就为空 System.out.println("list3 = " + list.get(i * 5 + 3)); if (!list.get(i * 5 + 3).equals(" ")) { String imageUrl1 = "http://10.0.2.2:8080/BBStuServlet/" + list.get(i * 5 + 3); String imageUrl = imageUrl1.replace(" ", ""); map2.put("imageUrl", imageUrl); } else { map2.put("imageUrl", ""); } listAll.add(map2); } notifyAll(); } } catch (Exception e) { e.printStackTrace(); } } }); myThread.start(); synchronized (myThread) { try { myThread.wait(); MyAdapter adapter = new MyAdapter(this); messageList.setAdapter(adapter); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } 但是运行的时候直接就黑屏没有响应了，请问这是怎么回事？到底是哪里不对 ============解决方案1============
你这里 myThread.wait();了，是在主线程里wait了啊，在等着线程里的notifyAll呢，当然会黑掉 你应该用handler来发消息============解决方案2============
楼主，1楼的说法是正确的，这里我把你的代码整理了下 ，红色字体为关键处 package app.example.testapp; import java.util.Arrays; import java.util.HashMap; import java.util.Map; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.app.Activity; import android.view.Menu; public class MainActivity extends Activity { Thread myThread = new Thread(new Runnable() { @Override public void run() { try { Map<String, String> map1 = new HashMap<String, String>(); map1.put("", ""); String retStr = ""; retStr = NetTool.sendGetRequest(messageShowUrl, map1, "utf-8"); String[] str = retStr.split(","); list = Arrays.asList(str); listAll.clear(); for (int i = 0; i < str.length / 5; i++) { Map<String, Object> map2 = new HashMap<String, Object>(); map2.put("user_name", list.get(i * 5)); map2.put("object_words", list.get(i * 5 + 1)); map2.put("my_words", list.get(i * 5 + 2)); map2.put("date", list.get(i * 5 + 4)); // 如果用户没有传照片，map2中传的imageUrl就为空 System.out.println("list3 = " + list.get(i * 5 + 3)); if (!list.get(i * 5 + 3).equals(" ")) { String imageUrl1 = "http://10.0.2.2:8080/BBStuServlet/" + list.get(i * 5 + 3); String imageUrl = imageUrl1.replace(" ", ""); map2.put("imageUrl", imageUrl); } else { map2.put("imageUrl", ""); } listAll.add(map2); } handler.sendEmptyMessage(0);//给Handler发送消息 } catch (Exception e) { e.printStackTrace(); } } }); Handler handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (msg.what==0) {//接收到对应的消息进行处理 MyAdapter adapter = new MyAdapter(this); messageList.setAdapter(adapter); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); myThread.start();// 开启线程 } }