Question

我不确定为什么按钮不起作用。 Eclipse没有显示任何红线，当我运行它时，我的应用程序中没有出现任何错误。我似乎是应用程序完全忽略了点击。我在XML中使用嵌套布局，这可能是原因吗？

当我点击图片时，图片似乎工作正常但不是按钮。

代码：

    public class HomeActivity extends Activity{

        private Button bSite;

        public void onCreate(Bundle savedInstanceState) 
        {
            super.onCreate(savedInstanceState);
            this.requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.homeactivity);

            //addListenerSiteButton();
            bSite = (Button) this.findViewById(R.id.s_button);
            bSite.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://irishfairy.com/"));
                    startActivity(browserIntent);
                 } 
              });

            GridView gv = (GridView) findViewById(R.id.grid_view);

            gv.setAdapter(new ImageAdapter(this));

            /**
             * On Click event for Single Gridview Item
             * */
           gv.setOnItemClickListener(new OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View v,
                        int position, long id) {

                    // Sending image id to FullScreenActivity
                    Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
                    // passing array index
                    i.putExtra("id", position);
                    startActivity(i);
                }
            });
        }
}

XML文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#000000">

    <LinearLayout
        android:id="@+id/main_linear"
        android:layout_alignParentBottom="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/s_button"
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/roundedsitebutton"
            android:gravity="center"
            android:padding="15dip"
            android:clickable="true"
            android:text="@string/site" />

    </LinearLayout>

    <GridView
        android:id="@+id/grid_view"
        android:layout_alignParentTop="true"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:numColumns="auto_fit"
        android:columnWidth="90dp"
        android:horizontalSpacing="10dp"
        android:verticalSpacing="10dp"
        android:gravity="center"
        android:stretchMode="columnWidth"
        android:layout_below="@+id/main_linear">
    </GridView>

</RelativeLayout>

编辑：我在我的XML中交换了android：layout_alignmentParentTop和android：layout_alignmentParentBottom并且它有效：

<LinearLayout
       android:layout_alignParentTop="true"
  </LinearLayout>
<GridView
     android:layout_alignParentBottom="true"
</GridView>

但我希望按钮位于底部。

当我运行应用程序时出现此消息：

03-21 16:51:02.051: D/AbsListView(9953): unregisterIRListener() is called

编辑：我尝试过改变：

android:layout_below="@+id/main_linear"

到

android:layout_above="@+id/main_linear"

但是我收到以下错误：

03-24 08:59:22.221: E/AndroidRuntime(31598): FATAL EXCEPTION: main
03-24 08:59:22.221: E/AndroidRuntime(31598): Process: com.apps.mobileapp, PID: 31598
03-24 08:59:22.221: E/AndroidRuntime(31598): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.apps.mobileapp/com.apps.mobileapp.HomeActivity}: java.lang.ClassCastException: android.widget.GridView cannot be cast to android.widget.Button

Answer 1

按钮onClickListener中似乎缺少@Override注释。尝试将其更改为：

bSite.setOnClickListener(new OnClickListener() {

    @Override //added this line
    public void onClick(View v) {
        Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://theirishfairydoorcompany.com/"));
        startActivity(browserIntent);
    }

});

如果上述建议不起作用，您可能还想尝试从按钮XML代码中删除android:clickable="true"。有时它会出现意外行为，并将点击移动到另一个视图（see this question）

<Button
        android:id="@+id/s_button"
        android:layout_weight="1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/roundedsitebutton"
        android:gravity="center"
        android:padding="15dip"
        android:text="@string/site" />

Answer 2

您的gridview正在阻止该按钮。而不是：android：layout_below =“@ + id / main_linear”，将其更改为android：layout_above =“@ + id / main_linear”

未检测到onClickListener

2 个答案: