Android 登录后打开“活动”
各位晚上好 我正在创建我的第一个android studio应用程序,我确实部分登录了,但我不知道在成功登录后如何打开新活动。有人能帮我吗 这是后台任务:Android 登录后打开“活动”,android,mysqli,phpmyadmin,Android,Mysqli,Phpmyadmin,各位晚上好 我正在创建我的第一个android studio应用程序,我确实部分登录了,但我不知道在成功登录后如何打开新活动。有人能帮我吗 这是后台任务: import android.content.Intent; import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.Snackbar; import an
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.os.AsyncTask;
import android.content.Context;
import android.os.AsyncTask;
import android.support.v7.app.AlertDialog;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
public class BackgroundTask extends AsyncTask <String, Void, String> {
Context ctx;
AlertDialog alertDialog;
BackgroundTask(Context ctx)
{
this.ctx=ctx;
}
protected void onPreExecute() {
super.onPreExecute();
alertDialog=new AlertDialog.Builder(ctx).create();
alertDialog.setTitle("Login Information......");
}
protected String doInBackground(String... params) {
String reg_url = "http://10.0.2.2/webapp/register.php";
String login_url = "http://10.0.2.2/webapp/login.php";
String method = params[0];
if (method.equals("register")) {
String name = params[1];
String user_name = params[2];
String user_pass = params[3];
try {
URL url = new URL(reg_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
OutputStream OS = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(OS, "UTF-8"));
String data = URLEncoder.encode("user", "UTF-8") + "=" + URLEncoder.encode(name, "UTF-8") + "&" + URLEncoder.encode("user_name", "UTF-8") + "=" + URLEncoder.encode(user_name, "UTF-8") + "&" +
URLEncoder.encode("user_pass", "UTF-8") + "=" + URLEncoder.encode(user_pass, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
OS.close();
InputStream IS = httpURLConnection.getInputStream();
IS.close();
return "Registration successfully.....";
}
catch (MalformedURLException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
return null;
}
else if(method.equals("login")){
String login_name = params[1];
String login_pass = params[2];
try {
URL url=new URL(login_url);
HttpURLConnection httpURLConnection= (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream= httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter=new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String data = URLEncoder.encode("login_name","UTF-8")+"="+URLEncoder.encode(login_name,"UTF-8")+"&"+URLEncoder.encode("login_pass","UTF-8")+"="
+URLEncoder.encode(login_pass,"UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream= httpURLConnection.getInputStream();
BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String response ="";
String line="";
while ((line=bufferedReader.readLine())!=null)
{
response+=line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return response;
}
catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
protected void onPostExecute(String result) {
if (result.equals("Registration successfully.....")) {
Toast.makeText(ctx, result, Toast.LENGTH_LONG).show();
} else {
alertDialog.setMessage(result);
alertDialog.show();
}
}
}
导入android.content.Intent;
导入android.os.Bundle;
导入android.support.design.widget.FloatingActionButton;
导入android.support.design.widget.Snackbar;
导入android.support.v7.app.AppActivity;
导入android.support.v7.widget.Toolbar;
导入android.view.view;
导入android.os.AsyncTask;
导入android.content.Context;
导入android.os.AsyncTask;
导入android.support.v7.app.AlertDialog;
导入android.widget.Toast;
导入java.io.BufferedReader;
导入java.io.BufferedWriter;
导入java.io.IOException;
导入java.io.InputStream;
导入java.io.InputStreamReader;
导入java.io.OutputStream;
导入java.io.OutputStreamWriter;
导入java.net.HttpURLConnection;
导入java.net.MalformedURLException;
导入java.net.URL;
导入java.net.urlcoder;
公共类BackgroundTask扩展了AsyncTask{
上下文ctx;
警报对话框警报对话框;
背景任务(上下文ctx)
{
这个.ctx=ctx;
}
受保护的void onPreExecute(){
super.onPreExecute();
alertDialog=新建alertDialog.Builder(ctx.create();
alertDialog.setTitle(“登录信息……”);
}
受保护的字符串doInBackground(字符串…参数){
字符串注册表url=”http://10.0.2.2/webapp/register.php";
字符串登录\u url=”http://10.0.2.2/webapp/login.php";
字符串方法=参数[0];
if(方法等于(“寄存器”)){
字符串名称=参数[1];
字符串user_name=params[2];
字符串user_pass=params[3];
试一试{
URL=新URL(注册URL);
HttpURLConnection HttpURLConnection=(HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod(“POST”);
httpURLConnection.setDoOutput(true);
OutputStream OS=httpURLConnection.getOutputStream();
BufferedWriter BufferedWriter=新的BufferedWriter(新的OutputStreamWriter(OS,“UTF-8”));
字符串数据=URLEncoder.encode(“用户”、“UTF-8”)+“=”+URLEncoder.encode(名称,“UTF-8”)+“&+URLEncoder.encode(“用户名称”、“UTF-8”)+“=”+URLEncoder.encode(用户名称,“UTF-8”)+“&”+
urlcoder.encode(“用户密码”,“UTF-8”)+“=”+urlcoder.encode(用户密码,“UTF-8”);
bufferedWriter.write(数据);
bufferedWriter.flush();
bufferedWriter.close();
OS.close();
InputStream=httpURLConnection.getInputStream();
IS.close();
返回“注册成功…”;
}
捕获(格式错误){
e、 printStackTrace();
}
捕获(IOE异常){
e、 printStackTrace();
}
返回null;
}
else if(method.equals(“login”)){
字符串login_name=params[1];
字符串login_pass=params[2];
试一试{
URL=新URL(登录\ URL);
HttpURLConnection HttpURLConnection=(HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod(“POST”);
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream OutputStream=httpURLConnection.getOutputStream();
BufferedWriter BufferedWriter=新的BufferedWriter(新的OutputStreamWriter(outputStream,UTF-8));
字符串数据=urlcoder.encode(“登录名”,“UTF-8”)+”=“+urlcoder.encode(登录名”,“UTF-8”)+”&“+urlcoder.encode(“登录密码”,“UTF-8”)+”=”
+URLEncoder.encode(登录密码,“UTF-8”);
bufferedWriter.write(数据);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream InputStream=httpURLConnection.getInputStream();
BufferedReader BufferedReader=新的BufferedReader(新的InputStreamReader(inputStream,“iso-8859-1”);
字符串响应=”;
字符串行=”;
而((line=bufferedReader.readLine())!=null)
{
响应+=行;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
返回响应;
}
捕获(格式错误){
e、 printStackTrace();
}捕获(IOE异常){
e、 printStackTrace();
}
}
返回null;
}
受保护的void onProgressUpdate(void…值){
super.onProgressUpdate(值);
}
受保护的void onPostExecute(字符串结果){
if(result.equals(“注册成功…”){
Toast.makeText(ctx,result,Toast.LENGTH_LONG).show();
}否则{
alertDialog.setMessage(结果);
alertDialog.show();
}
}
}
这是登录页面:
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
EditText ET_NAME, ET_PASS;
String login_name, login_pass;
Intent intent;
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ET_NAME= (EditText)findViewById(R.id.user_name);
ET_PASS= (EditText)findViewById(R.id.user_pass);
button= (Button)findViewById(R.id.button);
button.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v){
long endTime = System.currentTimeMillis()+20*10;
while(System.currentTimeMillis()< endTime){
synchronized(this){
try{
wait(endTime - System.currentTimeMillis());
}catch (InterruptedException e ){
e.printStackTrace();
}
}
// textView.setText("Button pressed");
}
}
}
);
}
public void userReg (View view)
{
startActivity(new Intent(this,Register.class));
}
public void userLogin (View view) {
login_name=ET_NAME.getText().toString();
login_pass=ET_PASS.getText().toString();
String method ="login";
BackgroundTask backgroundTask=new BackgroundTask(this);
backgroundTask.execute(method,login_name,login_pass);
}
}
导入android.support.v7.app.app活动;
导入android.os.Bundle;
导入android.content.Intent;
导入android.view.view;
导入android.widget.Button;
导入android.widget.EditText;
导入android.widget.TextView;
公共类MainActivity扩展了AppCompatActivity{
EditText ET_NAME,ET_PASS;
字符串login\u name,login\u pass;
意图;
按钮;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ET_NAME=(EditText)findViewById(R.id.user_NAME);
ET_PASS=(EditText)findViewById(R.id.user_PASS);
按钮=(按钮)findViewById(R.id.butto
protected void onPostExecute(String result) {
if (result.equals("Registration successfully.....")) {
Toast.makeText(ctx, result, Toast.LENGTH_LONG).show();
Intent intent = new Intent(ctx,SecondActivity.Class); //new Activity
startActivity(intent);
}
}
<activity
android:name=".SecondActivity">