Question

我正在创建一个android studio简单演示。我正在登录。但是当按下提交按钮时，它不会改变活动。 Main.java

public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        /* Get button Text1 Text2 */
        final EditText  edUsername  = (EditText) findViewById(R.id.etUser);
        final EditText  edPassword  = (EditText)findViewById(R.id.etPass);
        Button btnValidate = (Button)findViewById(R.id.bSubmit);
        btnValidate.setOnClickListener(new OnClickListener()
        {
            public void onClick(View arg0)
            {
                String uname  = edUsername.getText().toString();
                String pass = edPassword.getText().toString();
                if(uname.equals("user") && pass.equals("12345"))
                {
                    Intent intent = new Intent(Main.this,Success.class);
                    intent.putExtra("username",edUsername.getText().toString());
                    startActivity(intent);
                }
                else
                {
                    Toast.makeText(Main.this, "Invalid Usename password pair.", Toast.LENGTH_LONG).show();
                }
            }
        });
    }
}

Success.java

public class Success extends Activity
{
    protected void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.success);
        TextView tv = (TextView) findViewById(R.id.textView1);
        tv.setText("Welcome ,"+getIntent().getExtras().getString("username"));
    }
}

修改

        <activity
            android:name=".Success"
            android:label="AndroidTest"
            android:screenOrientation="portrait"
         />
        <activity
            android:name=".AndroidTest"
            android:label="AndroidTest" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

有什么问题？刚刚使用Mainfest文件内容对其进行了编辑。再次，当按下提交按钮时，它不会改变活动

Answer 1

您是否尝试在Manifest文件中添加Success Activity？类似下面的代码？
<activity android:name=".Success" android:label="@string/app_name" android:screenOrientation="portrait" android:theme="@style/AppTheme" />

希望这有帮助！

Answer 2

问题在于您的启动活动，应该是这样的

Intent intent = new Intent(this,Success.class);
                    intent.putExtra("username",edUsername.getText().toString());
                    startActivity(intent);

或

Intent intent = new Intent(Main.class,Success.class);
                    intent.putExtra("username",edUsername.getText().toString());
                    startActivity(intent);

在new intent(_,_)中，您需要先传递上下文。这可以通过使用this，getActivity()，getApplicationContext()来完成。希望这不会太晚

android-studio登录按钮不会改变活动

2 个答案: