Android 将代码移动到异步任务
**编辑:已解决** 我正在测试异步任务功能的示例代码。但是dobackGround()方法没有调用代码。我接受了一些帖子的帮助并重构了我的代码,但它仍然不起作用 这是主布局Android 将代码移动到异步任务,android,android-asynctask,android-studio-2.0,Android,Android Asynctask,Android Studio 2.0,**编辑:已解决** 我正在测试异步任务功能的示例代码。但是dobackGround()方法没有调用代码。我接受了一些帖子的帮助并重构了我的代码,但它仍然不起作用 这是主布局 <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/editText1"> </EditText>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/editText1">
</EditText>
<Button
android:text="Get Name"
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</Button>
<TextView
android:text="from Web service"
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
WebServiceActivity.java
public class MainActivity extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
public class WebServiceActivity extends Activity implements View.OnClickListener {
Button btn;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(this);
}
public void onClick(View view) {
switch (view.getId()) {
case R.id.button1:
new LongOperation().execute("");
break;
}
}
private class LongOperation extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
for (int i = 0; i < 5; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
Thread.interrupted();
}
}
return "Executed";
}
@Override
protected void onPostExecute(String result) {
TextView txt = (TextView) findViewById(R.id.textView1);
txt.setText("Executed"); // txt.setText(result);
}
@Override
protected void onPreExecute() {}
@Override
protected void onProgressUpdate(Void... values) {}
}
}
public class MainActivity extends Activity
{
TextView tvData1;
EditText edata;
Button button;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvData1 = (TextView)findViewById(R.id.textView1);
button=(Button)findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
new LongOperation().execute("");
}
});
}
private class LongOperation extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
for (int i = 0; i < 5; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
Thread.interrupted();
}
}
return "executed";
}
@Override
protected void onPostExecute(String result) {
tvData1.setText(result);
}
@Override
protected void onPreExecute() {}
@Override
protected void onProgressUpdate(Void... values) {}
}
}
公共类WebServiceActivity扩展活动实现View.OnClickListener{
按钮btn;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn=(按钮)findViewById(R.id.button1);
btn.setOnClickListener(此);
}
公共void onClick(视图){
开关(view.getId()){
案例R.id.button1:
新建LongOperation()。执行(“”);
打破
}
}
私有类LongOperation扩展了异步任务{
@凌驾
受保护的字符串doInBackground(字符串…参数){
对于(int i=0;i<5;i++){
试一试{
睡眠(1000);
}捕捉(中断异常e){
Thread.interrupted();
}
}
返回“已执行”;
}
@凌驾
受保护的void onPostExecute(字符串结果){
TextView txt=(TextView)findViewById(R.id.textView1);
txt.setText(“已执行”);//txt.setText(结果);
}
@凌驾
受保护的void onPreExecute(){}
@凌驾
受保护的void onProgressUpdate(void…值){}
}
}
WebServiceActivity包含扩展AsyncTask的内部类LongOperation。是我的布局没有正确绑定吗
需要一些建议吗
是否需要将整个视图移动到异步任务?我不能
寻找相关职位
=>不,您不应该将整个内容移动到AsyncTask。首先理解异步任务的四种不同方法的目的,并相应地移动您的东西
-执行开始前需要准备的内容。例如,显示进度条或对话框onPreExecute()
-用这种方法写下长时间运行的操作,比如进行web API调用doInBackground()
-您可以通过此方法将部分更新推送到UI。例如,进度条中的1/10种输出onProgressUpdate()
-UI更新或任何其他要执行长时间运行操作(即web API调用)的后期执行的操作onPostExecute()
- 如今,AsyncTask并没有被广泛使用,而是被用于其他一些方法
- 有一些第三方和最好的库可以帮助您实现长时间运行的任务。示例库是翻新的,OkHttp
- 目前,开发人员已经开始使用反应式方法,因此使用RxJava、RxAndroid库
- 您不需要将整个代码放入asynctask中,您必须将网络操作代码放入asynctask的doInBackground()中
public class MainActivity extends Activity
{
/**
* Called when the activity is first created.
*/
private static final String SOAP_ACTION ="http://tempuri.org/HelloWorld";
private static final String OPERATION_NAME = "findContact";
private static final String WSDL_TARGET_NAMESPACE = "http://tempuri.org/";
private static final String SOAP_ADDRESS = "http://10.0.2.2:31736/WebSite3/Service.asmx";
TextView tvData1;
EditText edata;
Button button;
String studentNo;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvData1 = (TextView) findViewById(R.id.textView1);
button = (Button) findViewById(R.id.button1);
edata = (EditText) findViewById(R.id.editText1);
button.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
studentNo = edata.getText().toString();
new BackgroundTask().execute();
}
});
}
class BackgroundTask extends AsyncTask<String, Void, String>
{
@Override
protected String doInBackground(String... params)
{
SoapObject request = new SoapObject(WSDL_TARGET_NAMESPACE, OPERATION_NAME);
PropertyInfo propertyInfo = new PropertyInfo();
propertyInfo.type = PropertyInfo.STRING_CLASS;
propertyInfo.name = "eid";
request.addProperty(propertyInfo, studentNo);
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = true;
envelope.setOutputSoapObject(request);
HttpTransportSE httpTransport = new HttpTransportSE(SOAP_ADDRESS);
try
{
httpTransport.call(SOAP_ACTION, envelope);
Object response = envelope.getResponse();
return response.toString();
} catch (Exception exception)
{
return exception.toString() + " Or enter number is not Available!";
}
}
@Override
protected void onPostExecute(String s)
{
tvData1.setText(s);
}
}
}
公共类MainActivity扩展活动
{
/**
*在首次创建活动时调用。
*/
私有静态最终字符串SOAP_ACTION=”http://tempuri.org/HelloWorld";
私有静态最终字符串操作\u NAME=“findContact”;
私有静态最终字符串WSDL\u TARGET\u NAMESPACE=”http://tempuri.org/";
私有静态最终字符串SOAP_地址=”http://10.0.2.2:31736/WebSite3/Service.asmx";
文本视图tvData1;
EditText-edata;
按钮;
弦乐学生号;
@凌驾
创建时的公共void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvData1=(TextView)findViewById(R.id.textView1);
按钮=(按钮)findViewById(R.id.button1);
edata=(EditText)findViewById(R.id.editText1);
setOnClickListener(新的OnClickListener()
{
公共void onClick(视图v)
{
studentNo=edata.getText().toString();
新建BackgroundTask().execute();
}
});
}
类BackgroundTask扩展了AsyncTask
{
@凌驾
受保护的字符串doInBackground(字符串…参数)
{
SoapObject请求=新的SoapObject(WSDL\u目标\u命名空间、操作\u名称);
PropertyInfo PropertyInfo=新的PropertyInfo();
propertyInfo.type=propertyInfo.STRING\u类;
propertyInfo.name=“eid”;
request.addProperty(propertyInfo,studentNo);
SoapSerializationEnvelope=新的SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet=true;
envelope.setOutputSoapObject(请求);
HttpTransportSE httpTransport=新的HttpTransportSE(SOAP\U地址);
尝试
{
调用(SOAP_操作,信封);
对象响应=envelope.getResponse();
返回response.toString();
}捕获(异常)
{
返回异常。toString()+“或输入数字不可用!”;
}
}
@凌驾
受保护的void onPostExecute(字符串s)
{
tvData1.setText(s);
}
}
}
我想您需要一个AsyncTask的示例,这里就是。这是一个使用AsyncTask的loginTask示例。希望它能帮助你
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.net.ConnectivityManager;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.Toast;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Created by jatin khattar on 01-10-2015.
*/
public class LoginTask extends AsyncTask<String, Integer, String> {
Context context;
User user;
private ConnectivityManager conMgr;
private Resources r;
private ProgressDialog dialog;
private Session session;
private final static String API_PARAM_TYPE="type";
private final static String API_PARAM_EMAIL="email";
private final static String API_PARAM_PASSWORD="password";
public LoginTask(Context context, User user, ConnectivityManager conMgr){
this.context = context;
this.user = user;
this.conMgr = conMgr;
r=context.getResources();
session=new Session(context);
}
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog=ProgressDialog.show(context, r.getString(R.string.progress_message), "Please Wait");
}
@Override
protected String doInBackground(String... params) {
API api=new API(this.context, conMgr);
api.setAPI("user");
api.setAction("login");
api.setParam(API_PARAM_TYPE, "general");
api.setParam(API_PARAM_EMAIL, user.email);
api.setParam(API_PARAM_PASSWORD, user.pass);
String result=api.process();
Log.d("API Response", result);
return result;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
dialog.dismiss();
try {
JSONObject res=new JSONObject(result);
if(res.getBoolean("success")){
session.CreateSession(res.getInt("id"), res.getString("name"), res.getString("auth_key"), res.getString("email"));
Toast.makeText(this.context, "Logged in Successfully", Toast.LENGTH_LONG).show();
Intent intnt = new Intent(context, MainActivity.class);
intnt.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
context.startActivity(intnt);
}else{
if(res.has("message")){
Toast.makeText(this.context, res.getString("message"), Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this.context, r.getString(R.string.error_message_unknown), Toast.LENGTH_SHORT).show();
}
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Toast.makeText(this.context, r.getString(R.string.error_invalid_response_message), Toast.LENGTH_SHORT).show();
}
}
}
导入android.app.ProgressDialog;
导入android.content.Context;
导入android.content.Intent;
导入android.content.res.Resources;
导入android.net.ConnectivityManager;
导入android.os.AsyncTask;
导入android.util.Log;
导入android.widget.Toast;
导入org.json.JSONException;
导入org.json.JSONObject;
/**
*由jatin khattar于2015年10月1日创建。
*/
酒吧
public class MainActivity extends Activity
{
TextView tvData1;
EditText edata;
Button button;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvData1 = (TextView)findViewById(R.id.textView1);
button=(Button)findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
new LongOperation().execute("");
}
});
}
private class LongOperation extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
for (int i = 0; i < 5; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
Thread.interrupted();
}
}
return "executed";
}
@Override
protected void onPostExecute(String result) {
tvData1.setText(result);
}
@Override
protected void onPreExecute() {}
@Override
protected void onProgressUpdate(Void... values) {}
}
}