[英]How to finish the Activity when I was in Another Acitvity
當我使用共享首選項類作為一個單獨的類時,我將檢查用戶是否已經登錄導航活動類,如果是第一次,那么它會在登錄活動中轉移我,否則繼續導航活動
但我的問題是,當我要回復登錄活動時,它應該關閉應用程序,但它會在導航活動中轉移我....請幫助我...
package com.apkglobal.no_dues;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
public class Shared {
SharedPreferences sp;
SharedPreferences.Editor ed;
String Filename="himanshu";
int mode=0;
Context context;
String First="first";
public Shared(Context context) {
this.context = context;
sp=context.getSharedPreferences(Filename,mode);
ed=sp.edit();
}
public void secondtime()
{
ed.putBoolean(First,true);
ed.commit();
}
public boolean firsttime()
{
if(!this.isfirst())
{
Intent i=new Intent(context,LoginActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
}
return false;
}
public boolean isfirst() {
return sp.getBoolean(First,false);
}
public void getback()
{
ed.putBoolean(First,false);
ed.commit();
}
}
Navigationacitivity.class
package com.apkglobal.no_dues;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AlertDialog;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
import com.apkglobal.no_dues.Fragment.AboutFragment;
import com.apkglobal.no_dues.Fragment.BookDetailsFragment;
import com.apkglobal.no_dues.Fragment.FeedbackFragment;
import com.apkglobal.no_dues.Fragment.HomeFragment;
import com.apkglobal.no_dues.Fragment.MarksFragment;
import com.apkglobal.no_dues.Fragment.NoDuesFormFragment;
public class NavigationActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener{
Button btn_mis,btn_attendence;
Shared shared;
String rollno;
SharedPreferences sp;
SharedPreferences.Editor ed;
NavigationView navigationView;
TextView tv_rollno;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
shared = new Shared(getApplicationContext());
shared.firsttime();
setContentView(R.layout.activity_navigation);
btn_attendence = (Button) findViewById(R.id.btn_attendence);
btn_mis=(Button)findViewById(R.id.btn_mis);
tv_rollno = (TextView)findViewById(R.id.tv_rollno);
navigationView = (NavigationView) findViewById(R.id.nav_view);
View header=navigationView.getHeaderView(0);
tv_rollno = (TextView)header.findViewById(R.id.tv_rollno);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
sp=getSharedPreferences("rajput",MODE_PRIVATE);
rollno=sp.getString("rollno",null);
tv_rollno.setText(rollno);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
navigationView.setNavigationItemSelectedListener(this);
defaultSelectitem(R.id.nav_homepage);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
}
else {
AlertDialog.Builder ab = new AlertDialog.Builder(NavigationActivity.this);
ab.setIcon(R.drawable.logo);
ab.setTitle("Exit Application");
ab.setMessage("Are You Sure ?");
ab.setCancelable(false);
ab.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
ab.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
ab.create();
ab.show();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.navigation, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
Intent i = new Intent(getApplicationContext(), SettingActivity.class);
startActivity(i);
} else if (id == R.id.action_contact) {
Intent i = new Intent(getApplicationContext(), ContactActivity.class);
startActivity(i);
} else if (id == R.id.action_search) {
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
defaultSelectitem(item.getItemId());
return true;
}
private void defaultSelectitem(int itemId) {
Fragment fragment = null;
switch (itemId) {
case R.id.nav_homepage:
fragment = new HomeFragment();
break;
case R.id.nav_nodues_form:
fragment = new NoDuesFormFragment();
break;
case R.id.nav_feedback:
fragment = new FeedbackFragment();
break;
case R.id.nav_marks:
fragment = new MarksFragment();
break;
case R.id.nav_book:
fragment = new BookDetailsFragment();
break;
case R.id.nav_about:
fragment = new AboutFragment();
break;
case R.id.nav_fees_detail:
Intent intent = new Intent(NavigationActivity.this,FeesDetail.class);
startActivity(intent);
break;
case R.id.nav_share:
break;
case R.id.nav_logout:
shared.getback();
Intent i = new Intent(getApplicationContext(), LoginActivity.class);
startActivity(i);
finish();
break;
}
if (fragment != null) {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction().replace(R.id.frame, fragment);
fragmentTransaction.commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
}
}
在您的Manifest.xml
為LoginActivity
添加android:noHistory=true
。 因此,登錄活動不會在后台堆棧上。
只需添加finish()
即可完成當前活動:
if(!this.isfirst()){
Intent i=new Intent(context,LoginActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
finish()
}
您必須將Activity作為參數而不是上下文。 然后在開始活動后,您應該完成當前活動。
你的代碼應該是這樣的。
package com.apkglobal.no_dues;
import android.content.Intent;
import android.content.SharedPreferences;
public class Shared {
SharedPreferences sp;
SharedPreferences.Editor ed;
String Filename="himanshu";
int mode=0;
Activity activity;
String First="first";
public Shared(Activity activity) {
this.activity= context;
sp=activity.getSharedPreferences(Filename,mode);
ed=sp.edit();
}
public void secondtime()
{
ed.putBoolean(First,true);
ed.commit();
}
public boolean firsttime()
{
if(!this.isfirst())
{
Intent i=new Intent(activity,LoginActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
activity.startActivity(i);
activity.finish();
}
return false;
}
public boolean isfirst() {
return sp.getBoolean(First,false);
}
public void getback()
{
ed.putBoolean(First,false);
ed.commit();
}
}
希望能幫助到你:)
use NavigationActivity.this instead of getApplicationContext()
shared = new Shared(NavigationActivity.this);
shared.firsttime();
and call finish(); method after startActivity();
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