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  • 初识Spinner

    Spinner是个下拉列表框,与listview一样,也是adapterView的一个间接子类,是一个显示数据的窗口。

     <Spinner
                android:id="@+id/spinner1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:entries="@array/spinner_name"
                android:prompt="@string/hello_world" />

    为Spinner设定数据来源

    <?xml version="1.0" encoding="utf-8"?>
    <resources>
        <string-array name="spinner_name">
            <item>Mercury</item>
            <item>Venus</item>
            <item>Earth</item>
            <item>Mars</item>
            <item>Jupiter</item>
            <item>Saturn</item>
            <item>Uranus</item>
            <item>Neptune</item>
        </string-array>
    </resources>

    为Spinner设置adapter并添加事件响应

     1     public void showSpinner() {
     2         Spinner spinner = (Spinner) findViewById(R.id.spinner2);
     3         //The simple_spinner_item layout is provided by the platform and is the default layout you should use unless you'd like to define your own layout for the spinner's appearance.
             SpinnerAdapter spinnerAdapter = ArrayAdapter.createFromResource(FormActivity.this, R.array.spinner_name,android.R.layout.simple_spinner_item); 8         

            // Specify the layout to use when the list of choices appears | Sets the layout resource to create the drop down views.
            spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

     
     9         spinner.setAdapter(spinnerAdapter);
    10         spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
    19 
    20             @Override
    21             public void onItemSelected(AdapterView<?> parent, View view,
    22                     int position, long id) {
    23                 // TODO Auto-generated method stub
    24 
    25                 Log.i(TAG,
    26                         "showSpinner : onItemSelected "
    27                                 + ((TextView) view).getText() + ":position "
    28                                 + id);
    29             }
    30 
    31             @Override
    32             public void onNothingSelected(AdapterView<?> parent) {
    33                 // TODO Auto-generated method stub
    34                 Log.i(TAG, "showSpinner : onNothingSelected ");
    35             }
    36         });
    37 
    38     }
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  • 原文地址:https://www.cnblogs.com/izhanjun/p/4185945.html
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