Android:点击时无法切换到新活动

时间:2012-11-21 11:36:43

标签: android android-intent

我有一个带有两个按钮的主页。 Button1加载Activity2.class(显示地图),Button2加载Login.class(显示登录表单)。

Button1正在运行,但Button2在点击时不执行任何操作。我只是看不出差异,我对两个按钮使用完全相同的代码结构。也许我错过了一个不同的文件?

这个Android的东西对我来说都是新手,希望有人可以帮忙!

这是我的代码(没有错误)

主要活动。

public class AppActivity extends Activity {

Button button;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    addListenerOnButton();
}

public void addListenerOnButton() {

    final Context context = this;

    button = (Button) findViewById(R.id.button1);

    button.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {

            Intent intent = new Intent(context, App2Activity.class);
            startActivity(intent);   

        }

    });



}

public void addListenerOnButton2() {

    final Context context = this;

    button = (Button) findViewById(R.id.button2);

    button.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {

            Intent intent = new Intent(context, Login.class);
            startActivity(intent);   

        }

    });

}
}

这是登录活动,我正试图进入

public class Login extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // setting default screen to login.xml
        setContentView(R.layout.login);

    }
}

Login.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:fillViewport="true">
  <RelativeLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:background="#ffffff">

    <LinearLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="vertical"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:padding="10dip">

      <!--  Email Label -->
      <TextView android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textColor="#372c24"
            android:text="Student Number"/>
      <EditText android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dip"
            android:layout_marginBottom="20dip"
            android:singleLine="true"/>
      <!--  Password Label -->
      <TextView android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textColor="#372c24"
            android:text="Password"/>
      <EditText android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dip"
            android:singleLine="true"
            android:password="true"/>
      <!-- Login button -->
      <Button android:id="@+id/btnLogin"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dip"
            android:text="Login"/>
    <!-- Login Form Ends -->
    </LinearLayout>

  </RelativeLayout>
</ScrollView>

清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mkyong.android"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="10" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:label="@string/app_name"
        android:name=".AppActivity" >
        <intent-filter >
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:label="@string/app_name"
        android:name=".App2Activity" >
    </activity>
    <activity
        android:label="@string/app_name"
        android:name=".Login" >           
    </activity>
</application>

</manifest>

6 个答案:

答案 0 :(得分:3)

您没有致电addListenerOnButton2();

答案 1 :(得分:0)

在AppActivity类的on createMethod上添加addListenerOnButton2(),就像你添加一样 addListenerOnButton();

public class AppActivity extends Activity
{

Button button;

@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    addListenerOnButton();
    addListenerOnButton2();
}

答案 2 :(得分:0)

缺少方法调用addListenerOnButton2()

答案 3 :(得分:0)

将您的代码块更改为以下

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addListenerOnButton();
addListenerOnButton2();// you are not calling this method in your code
}

答案 4 :(得分:0)

您永远不会在onCreate()中(或您发布的代码中的任何其他位置)调用addListenerOnButton2()方法。

答案 5 :(得分:0)

试试以下代码。

 public class AppActivity extends Activity {

    Button button,button1;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

                button = (Button) findViewById(R.id.button1);
            button1 = (Button) findViewById(R.id.button2);

            button.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View arg0) {

                    Intent intent = new Intent(AppActivity.this, App2Activity.class);
                    startActivity(intent);   

                }

            });

            button1.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View arg0) {

                    Intent intent = new Intent(AppActivity.this, Login.class);
                    startActivity(intent);   

                }

            });
 }