今天学习了模拟踢用户下线。
代码为:
public class ActivityCollector { private static List<Activity> activities = new ArrayList<Activity>(); public static void addActivity(Activity activity) { activities.add(activity); } public static void removeActivity(Activity activity) { activities.remove(activity); } public static void finishAll() { for (Activity activity : activities) { if (!activity.isFinishing()) { activity.finish(); } } } }
public class BaseActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ActivityCollector.addActivity(this); } @Override protected void onDestroy() { super.onDestroy(); ActivityCollector.removeActivity(this); } }
public class LoginActivity extends BaseActivity implements View.OnClickListener{ private SharedPreferences pref; private SharedPreferences.Editor editor; private EditText edit_user; private EditText edit_pawd; private Button btn_login; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); pref = PreferenceManager.getDefaultSharedPreferences(this); bindViews(); } private void bindViews() { edit_user = (EditText) findViewById(R.id.edit_user); edit_pawd = (EditText) findViewById(R.id.edit_pawd); btn_login = (Button) findViewById(R.id.btn_login); btn_login.setOnClickListener(this); } @Override protected void onStart() { super.onStart(); if(!pref.getString("user","").equals("")){ edit_user.setText(pref.getString("user","")); edit_pawd.setText(pref.getString("pawd","")); } } @Override public void onClick(View v) { String user = edit_user.getText().toString(); String pawd = edit_pawd.getText().toString(); if(user.equals("123")&&pawd.equals("123")){ editor = pref.edit(); editor.putString("user", user); editor.putString("pawd", pawd); editor.commit(); Intent intent = new Intent(LoginActivity.this, MainActivity.class); startActivity(intent); Toast.makeText(LoginActivity.this,"哟,竟然蒙对了~",Toast.LENGTH_SHORT).show(); finish(); }else{ Toast.makeText(LoginActivity.this,"这么简单都输出,脑子呢?",Toast.LENGTH_SHORT).show(); } } }
public class MyBcReceiver extends BroadcastReceiver { @Override public void onReceive(final Context context, Intent intent) { AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(context); dialogBuilder.setTitle("警告:"); dialogBuilder.setMessage("您的账号在别处登录,请重新登陆~"); dialogBuilder.setCancelable(false); dialogBuilder.setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ActivityCollector.finishAll(); Intent intent = new Intent(context, LoginActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(intent); } }); AlertDialog alertDialog = dialogBuilder.create(); alertDialog.getWindow().setType( WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); alertDialog.show(); } }
public class MainActivity extends BaseActivity { private MyBcReceiver localReceiver; private LocalBroadcastManager localBroadcastManager; private IntentFilter intentFilter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); localBroadcastManager = LocalBroadcastManager.getInstance(this); //初始化广播接收者,设置过滤器 localReceiver = new MyBcReceiver(); intentFilter = new IntentFilter(); intentFilter.addAction("com.jay.mybcreceiver.LOGIN_OTHER"); localBroadcastManager.registerReceiver(localReceiver, intentFilter); Button btn_send = (Button) findViewById(R.id.btn_send); btn_send.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent("com.jay.mybcreceiver.LOGIN_OTHER"); localBroadcastManager.sendBroadcast(intent); } }); } @Override protected void onDestroy() { super.onDestroy(); localBroadcastManager.unregisterReceiver(localReceiver); } }