Question

亲爱的我正在使用以下代码来创建带有图像视图的自定义标题。但是它显示了imageview的空指针异常。怎么解决这个问题？

    public class MyCustomTab2Activity extends TabActivity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); 
                    //Tab Content
        setContentView(R.layout.my_tab_home);       
        ImageView imag = (ImageView) findViewById(R.id.iv_logout);         
        imag.setOnClickListener( new OnClickListener() {

        @Override
        public void onClick(View v) {

        }
        });
                    //custom title bar content
        getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.logintitle); 

        ......


        ...........


    }

}

Answer 1

只需将以下代码放在TabHost主要活动 -

中

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

    setContentView(R.layout.main);

    getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.window_title);

    ImageView image = (ImageView)findViewById(R.id.header);

    image.setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // TODO Auto-generated method stub

            Toast.makeText(CustomWindowTitle.this, "This is sample", Toast.LENGTH_SHORT).show();

            return false;
        }
    });
}

<强> Window_title.xml

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="35dip"
android:gravity="center_vertical"
android:paddingLeft="5dip"
android:background="#323331">

<ImageView 
    android:id="@+id/header" 
    android:src="@drawable/header"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"/>

</LinearLayout>

希望这对你有所帮助。请参阅下面的输出 -

CustomWindowTitle

<强>更新

我明白了。您在图片OnclickListener之后宣布自定义标题在代码中进行更改，如下所示 -

public class MyCustomTab2Activity extends TabActivity {

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); 
                //Tab Content
    setContentView(R.layout.my_tab_home);       

    //custom title bar content
    getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.logintitle); 

    ImageView imag = (ImageView) findViewById(R.id.iv_logout);         
    imag.setOnClickListener( new OnClickListener() {

    @Override
    public void onClick(View v) {

    }
    });

    ......


    ...........


}

}

希望这会对你有所帮助。

Answer 2

ImageView并非真正意图以这种方式使用，您可以尝试两件事。在ImageView，imag.setFocusable=(true)上设置以下标记并查看是否有效，或者尝试使用ImageButton，或只使用Button属性background设置为您的图像，因为它设计为以这种方式使用。

自定义标题栏，带有TabActivity的图像视图

2 个答案: