我正在处理一个应用程序,我想只在他/她注销他以前的会话时才进行用户登录,但我无法做到。每当我关闭我的程序并重新打开它。即使我没有注销,它也会再次指向主页。 PLZ
package in.co.medimap.www.medimap;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import static in.co.medimap.www.medimap.R.layout.login;
/**
* Created by sony on 28-04-2016.
*/
public class login extends Activity {
TextView signup_text;
Button login_button;
EditText PHONE_NO,PASSWORD;
AlertDialog.Builder builder;
public static final String MyPREFERENCE ="Myprefs";
public static final String PHONE="phone";
public static final String PASS="password";
SharedPreferences sharedPreferences;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.login);
signup_text=(TextView)findViewById(R.id.sign_up);
signup_text.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
startActivity(new Intent(login.this,register.class));
}
});
PHONE_NO=(EditText)findViewById(R.id.phone_no);
PASSWORD=(EditText)findViewById(R.id.password);
login_button=(Button)findViewById(R.id.login_button);
login_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String ph = PHONE_NO.getText().toString();
String p=PASSWORD.getText().toString();
if (ph.equals("")||p.equals("")) {
builder = new AlertDialog.Builder(login.this);
builder.setTitle("Something went wrong...");
builder.setMessage("Please fill all the fields...");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
else
{
//see from here
sharedPreferences = getSharedPreferences(MyPREFERENCE,Context.MODE_PRIVATE );
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(PHONE, ph);
editor.putString(PASS, p);
editor.commit();
BackgroundTask backgroundTask = new BackgroundTask(login.this);
backgroundTask.execute("login",ph,p);
}
}
});
}
}
这是我的家庭活动,在用户登录之后 我希望如果我没有注销,那么每当我打开我的应用程序时,它应该从这里开始
package in.co.medimap.www.medimap;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class HomeActivity extends Activity {
Button Logout = null;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Logout = (Button) findViewById(R.id.Logout);
textView = (TextView) findViewById(R.id.welcome_txt);
String message = getIntent().getStringExtra("message");
textView.setText(message);
Logout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences sharedPreferences = getSharedPreferences(login.MyPREFERENCE, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.commit();
Intent intent = new Intent(HomeActivity.this,MainActivity.class);
startActivity(intent);
}
});
}
}
答案 0 :(得分:1)
如果您希望每次用户离开应用程序时都发生注销,为什么不手动执行?
您已经设置了退出按钮setOnClickListener
,所以只需执行此操作:
@Override
protected void onPause() {
super.onPause();
if(Logout != null) {
Logout.callOnClick();
}
}
这意味着每次用户离开此活动时都会退出 确保你处理的情况是,如果他们离开活动但是在你的页面上进行不同的活动,它就不会退出。
===========编辑===========
我猜你的login
活动是应用程序打开时启动的主要活动,所以在执行任何其他任务之前将其放在onCreate
中。在setContentView
之后,你应该这样做。
SharedPreferences sharedPreferences = getSharedPreferences(login.MyPREFERENCE, Context.MODE_PRIVATE);
String phone = sharedPreferences.getString(PHONE, "");
String pass = sharedPreferences.getString(PASS, "");
if(!phone.isEmpty() && !pass.isEmpty()) {
// this means ID and passwords are already saved so just start your home activity here
startActivity(new Intent(context, MainActivity.class));
finish();
}
在MainActivity
:
只需阅读SharedPreferences
中的值并在必要时登录。
希望这有帮助。
==========编辑2
此外,您的退出应该如下所示。请勿使用commmit
或clear
。放空值并使用apply
Logout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences sharedPreferences = getSharedPreferences(login.MyPREFERENCE, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(PHONE, "");
editor.putString(PASS, "");
editor.apply();
Intent intent = new Intent(HomeActivity.this,MainActivity.class);
startActivity(intent);
}
});