调用主要活动在Android中显示未找到活动的异常

Question

这是我的主要活动。如果行动完成，我想再次调用主要活动。但它说未找到活动

LayoutActivity

<activity
            android:name="com.layout.LayoutActivity"
            android:label="V-Alert Registration" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

调用作为主要活动的LayoutActivity这是我用来调用布局活动的代码（主要活动），它显示未找到活动

if(i>=1)
  {
   Toast.makeText(FiveActivity.this,"You Registerd already with one mail\n Delete the                   mail and Register with new mail",Toast.LENGTH_LONG).show();
         try{
                       Intent obj=new Intent("com.layout.LayoutActivity");
                       startActivity(obj);}

                catch(Exception e)
                            {
                                Toast.makeText(FiveActivity.this,e.toString(),Toast.LENGTH_LONG).show();    
                            }
           }

Answer 1

Intent obj=new Intent(FiveActivity.this,LayoutActivity.class);
startActivity(obj);
finish();

Answer 2

在你的程序中使用：

Intent obj = new Intent(); 
obj.setClassName("com.layout.LayoutActivity"); // Are you sure?? this is your class package name 
startActivity(obj); 

Answer 3

试试这个： -

 if(i>=1)
      {
       Toast.makeText(FiveActivity.this,"You Registerd already with one mail\n Delete the                   mail and Register with new mail",Toast.LENGTH_LONG).show();
             try{
                         Intent obj=new Intent(FiveActivity.this,LayoutActivity.class);
               startActivity(obj);}

                    catch(Exception e)
                                {
                                    Toast.makeText(FiveActivity.this,e.toString(),Toast.LENGTH_LONG).show();    
                                }
               }

Answer 4

您可以这样打电话：这会再次调用您的特定活动。

Intent i = getIntent();
finish();
startActivity(i);

Answer 5

通过此更改您的清单...

   <activity
        android:name="com.layout.LayoutActivity"
        android:label="V-Alert Registration" >
    </activity>

然后开始你的LayoutActivity ......

if(i>=1){

    Toast.makeText(FiveActivity.this,"You Registerd already with one mail\n Delete the mail 
                       and Register with new mail",Toast.LENGTH_LONG).show();
    try{
        Intent obj=new Intent(FiveActivity.this, LayoutActivity.class);
        startActivity(obj);

    }catch(Exception e) {
         Toast.makeText(FiveActivity.this,e.toString(),Toast.LENGTH_LONG).show();    
                            }
    }
}