需要帮助从task2以后更具体地查看代码，这是错误的来源，但我无法弄清楚。假设对于循环不建议是否有任何其他替代方案，我想要的代码？除了这个getInformations之外，该类实际上还调用了其他2个我没有上传的类。这就是为什么我需要返回drawable。谢谢你
private AsyncTask<String, Void, String> task; private AsyncTask<String, Void, String> task1; private AsyncTask<String, Void, Drawable[]> task2;
public void getInformations(){
task = new AsyncTask<String, Void, String>() {
ProgressDialog dialog;
Bundle bundle;
String res;
@Override
protected void onPreExecute(){
dialog = new ProgressDialog(Thoughts.this, ProgressDialog.STYLE_SPINNER);
dialog.setMessage("Loading Data...");
dialog.setCancelable(false);
dialog.setCanceledOnTouchOutside(false);
dialog.show();
}
@Override
protected String doInBackground(String... arg0) {
bundle = getIntent().getExtras();
res = bundle.getString("Username");
return res;
}
@Override
protected void onPostExecute(String result) {
dialog.dismiss();
username = result;
task1 = new AsyncTask<String, Void, String>() {
ProgressDialog dialog1;
ArrayList<NameValuePair> postParameters;
String response1;
String res1;
@Override
protected void onPreExecute(){
thoughtsDynamicListView = (ListView) findViewById(R.id.lvThoughts);
postParameters = new ArrayList<NameValuePair>();
dialog1 = new ProgressDialog(Thoughts.this, ProgressDialog.STYLE_SPINNER);
dialog1.setMessage("Loading Data...");
dialog1.setCancelable(false);
dialog1.setCanceledOnTouchOutside(false);
dialog1.show();
}
@Override
protected String doInBackground(String... arg0) {
try {
response1 = CustomHttpClient.executeHttpPost("http://whatstherex.info/getT.php", postParameters);
res1 = response1.toString();
res1 = res1.replaceAll("null", "");
thoughtsList = res1.toString();
return thoughtsList;
}catch(Exception e){
res1 = e.toString();
return res1;
}
}
@Override
protected void onPostExecute(String result1) {
dialog1.dismiss();
feed = result1.split("[_]");
task2 = new AsyncTask<String, Void, Drawable[]>() {
ProgressDialog dialog2;
InputStream is;
Drawable[] d;
Drawable p4, p8, p12, p16, p20, p24, p28, p32, p36, p40, p44, p48, p52, p56, p60, p64, p68, p72, p76, p80, p84, p88, p92, p96, p100;
@Override
protected void onPreExecute(){
dialog2 = new ProgressDialog(Thoughts.this, ProgressDialog.STYLE_SPINNER);
dialog2.setMessage("Loading Data...");
dialog2.setCancelable(false);
dialog2.setCanceledOnTouchOutside(false);
dialog2.show();
}
@Override
protected Drawable[] doInBackground(String... src) {
for(int i=0; i<src.length; i++){
try
{
is = (InputStream) new URL(src[i]).getContent();
d[i] = Drawable.createFromStream(is, "src name"+i);
}catch (Exception e) {
e.toString();
}
}
return d;
}
@Override
protected void onPostExecute(Drawable[] result2) {
dialog2.dismiss();
p4 = result2[1];
p8 = result2[2];
p12 = result2[3];
p16 = result2[4];
p20 = result2[5];
p24 = result2[6];
p28 = result2[7];
p32 = result2[8];
p36 = result2[9];
p40 = result2[10];
p44 = result2[11];
p48 = result2[12];
p52 = result2[13];
p56 = result2[14];
p60 = result2[15];
p64 = result2[16];
p68 = result2[17];
p72 = result2[18];
p76 = result2[19];
p80 = result2[20];
p84 = result2[21];
p88 = result2[22];
p92 = result2[23];
p96 = result2[24];
p100 = result2[25];
thoughtsInputs.add(new ThoughtsData(feed[1].toString(), feed[2].toString(), feed[3].toString(), p4));
thoughtsInputs.add(new ThoughtsData(feed[5].toString(), feed[6].toString(), feed[7].toString(), p8));
thoughtsInputs.add(new ThoughtsData(feed[9].toString(), feed[10].toString(), feed[11].toString(), p12));
thoughtsInputs.add(new ThoughtsData(feed[13].toString(), feed[14].toString(), feed[15].toString(), p16));
thoughtsInputs.add(new ThoughtsData(feed[17].toString(), feed[18].toString(), feed[19].toString(), p20));
thoughtsInputs.add(new ThoughtsData(feed[21].toString(), feed[22].toString(), feed[23].toString(), p24));
thoughtsInputs.add(new ThoughtsData(feed[25].toString(), feed[26].toString(), feed[27].toString(), p28));
thoughtsInputs.add(new ThoughtsData(feed[29].toString(), feed[30].toString(), feed[31].toString(), p32));
thoughtsInputs.add(new ThoughtsData(feed[33].toString(), feed[34].toString(), feed[35].toString(), p36));
thoughtsInputs.add(new ThoughtsData(feed[37].toString(), feed[38].toString(), feed[39].toString(), p40));
thoughtsInputs.add(new ThoughtsData(feed[41].toString(), feed[42].toString(), feed[43].toString(), p44));
thoughtsInputs.add(new ThoughtsData(feed[45].toString(), feed[46].toString(), feed[47].toString(), p48));
thoughtsInputs.add(new ThoughtsData(feed[49].toString(), feed[50].toString(), feed[51].toString(), p52));
thoughtsInputs.add(new ThoughtsData(feed[53].toString(), feed[54].toString(), feed[55].toString(), p56));
thoughtsInputs.add(new ThoughtsData(feed[57].toString(), feed[58].toString(), feed[59].toString(), p60));
thoughtsInputs.add(new ThoughtsData(feed[61].toString(), feed[62].toString(), feed[63].toString(), p64));
thoughtsInputs.add(new ThoughtsData(feed[65].toString(), feed[66].toString(), feed[67].toString(), p68));
thoughtsInputs.add(new ThoughtsData(feed[69].toString(), feed[70].toString(), feed[71].toString(), p72));
thoughtsInputs.add(new ThoughtsData(feed[73].toString(), feed[74].toString(), feed[75].toString(), p76));
thoughtsInputs.add(new ThoughtsData(feed[77].toString(), feed[78].toString(), feed[79].toString(), p80));
thoughtsInputs.add(new ThoughtsData(feed[81].toString(), feed[82].toString(), feed[83].toString(), p84));
thoughtsInputs.add(new ThoughtsData(feed[85].toString(), feed[86].toString(), feed[87].toString(), p88));
thoughtsInputs.add(new ThoughtsData(feed[89].toString(), feed[90].toString(), feed[91].toString(), p92));
thoughtsInputs.add(new ThoughtsData(feed[93].toString(), feed[94].toString(), feed[95].toString(), p96));
thoughtsInputs.add(new ThoughtsData(feed[97].toString(), feed[98].toString(), feed[99].toString(), p100));
adaptor = new ThoughtsCustomFeedAdaptor(Thoughts.this, R.layout.thoughtsdata, thoughtsInputs);
thoughtsDynamicListView.setAdapter(adaptor);
}
};
task2.execute(feed[4], feed[8], feed[12], feed[16], feed[20], feed[24], feed[28], feed[32], feed[36], feed[40], feed[44], feed[48],
feed[52], feed[56], feed[60], feed[64], feed[68], feed[72], feed[76], feed[80], feed[84], feed[88], feed[92], feed[96], feed[100]);
}
};
task1.execute();
}
};
task.execute();
}
答案 0 :(得分：0)
我认为不可能像这样链接asynctask，因为asynctask应该从UI线程启动。
你应该在你的活动中做一个处理程序（在UI线程中执行）
mhandler = new Handler(getMainLooper(),new Callback() {
@Override
public boolean handleMessage(Message msg) {
switch (msg.what) {
case (1):
task1.execute();
break;
case(2):
break;
task2.execute();
return false;
}
});
在你的asyncTask中添加类似的东西，而不是直接启动任务
Message m = new Message();
m.what = 1; // 1 or 2 depends of your task
mhandler.sendMessage(m);
使用此处理程序，您的任务将从UI线程开始。