如果要为AutoCompleteTextView使用onClickListener,请不要在XML中进行操作,而应在Java文件中进行操作。请参阅下面的答案。

原始问题

抱歉,如果我错过了一些简单的事情,但是在过去2个小时中我一直在努力工作,但我遇到了麻烦。

在我的活动中,我有4个AutoCompleteTextViews,它们由ArrayList填充,其值来自数据库查询。一切正常,直到在四个AutoCompleteTextViews的任何一个上添加android:onClick属性。我不知道发生了什么,清理项目并没有拯救我。

以下是相关代码:

我用于AutoCompleteTextViews的全局变量:

private ArrayList<String> brands = new ArrayList<String>();
private ArrayList<String> items = new ArrayList<String>();
private ArrayList<String> parts = new ArrayList<String>();
private ArrayList<String> barcodes = new ArrayList<String>();

private AutoCompleteTextView brandACTV;
private AutoCompleteTextView itemACTV;
private AutoCompleteTextView partACTV;
private AutoCompleteTextView barcodeACTV;

private ArrayAdapter<String> adapter;


我的onCreate()函数,非常标准,我设置布局并初始化AutoCompleteTextViews

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_search_page);

    TextView customerName = (TextView) findViewById(R.id.customerName);
    customerName.setText(getIntent().getStringExtra("customer"));

    brandACTV = (AutoCompleteTextView) findViewById(R.id.actvBrand);
    itemACTV = (AutoCompleteTextView) findViewById(R.id.actvItemName);
    partACTV = (AutoCompleteTextView) findViewById(R.id.actvPart);
    barcodeACTV = (AutoCompleteTextView) findViewById(R.id.actvBarcode);


    new InitTask().execute("");
}


执行InitTask线程时发生的情况是,我在执行数据库查询以为AutoCompleteTextViews初始化ArrayList数组时显示旋转进度条。

在InitTask的doInBackground方法中,我调用getArrays()函数:

public void getArrays(){
            //itemListDB is an object of my DatabaseAdapter class
    itemListDB.open();

    brands = itemListDB.getAllBrands();
    items = itemListDB.getAllItemNames();
    parts = itemListDB.getAllParts();
    barcodes = itemListDB.getAllBarcodes();

    itemListDB.close();

}


而且由于无法在doInBackground()方法中更新UI,因此我在线程的setAutoCompeteTextViews()方法中调用了onPostExecute()方法:

public void setAutoCompeteTextViews(){

    adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, brands);
    brandACTV.setAdapter(adapter);
    brandACTV.setThreshold(1);

    adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, items);
    itemACTV.setAdapter(adapter);
    itemACTV.setThreshold(1);

    adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, parts);
    partACTV.setAdapter(adapter);
    partACTV.setThreshold(1);

    adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, barcodes);
    barcodeACTV.setAdapter(adapter);
    barcodeACTV.setThreshold(1);

}


对于我的XML,我将仅展示如何编写一个AutoCompleteTextView,因为它们都很相似,只是id有所不同。

<AutoCompleteTextView
    android:id="@+id/actvBrand"
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    android:layout_above="@+id/price"
    android:layout_alignLeft="@+id/submit"
    android:ems="10"
    android:hint="Brand"
    android:onClick="actvClicked" />


然后在活动中定义actvClicked()函数,如下所示:

public void actvClicked(View view){
    switch (view.getId()) {
        case R.id.actvBrand:
            Log.d("Hi", "Brand pressed");
            break;

        case R.id.actvItemName:
            Log.d("Hi", "Item name pressed");
            break;

        case R.id.actvPart:
            Log.d("Hi", "Part pressed");
            break;

        case R.id.actvBarcode:
            Log.d("Hi", "Barcode pressed");
            break;
    }
}


但是,它不起作用,logCat给了我这个错误:

04-25 15:40:28.270: E/AndroidRuntime(24104): FATAL EXCEPTION: main
04-25 15:40:28.270: E/AndroidRuntime(24104): Process: com.agict.marswin, PID: 24104
04-25 15:40:28.270: E/AndroidRuntime(24104): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.agict.marswin/com.agict.marswin.SearchPage}: android.view.InflateException: Binary XML file line #73: Error inflating class android.widget.AutoCompleteTextView
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.os.Handler.dispatchMessage(Handler.java:102)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.os.Looper.loop(Looper.java:136)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.app.ActivityThread.main(ActivityThread.java:5017)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at java.lang.reflect.Method.invokeNative(Native Method)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at java.lang.reflect.Method.invoke(Method.java:515)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at dalvik.system.NativeStart.main(Native Method)
04-25 15:40:28.270: E/AndroidRuntime(24104): Caused by: android.view.InflateException: Binary XML file line #73: Error inflating class android.widget.AutoCompleteTextView
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.view.LayoutInflater.createView(LayoutInflater.java:620)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.app.Activity.setContentView(Activity.java:1929)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at com.agict.marswin.SearchPage.onCreate(SearchPage.java:39)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.app.Activity.performCreate(Activity.java:5231)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
04-25 15:40:28.270: E/AndroidRuntime(24104):    ... 11 more
04-25 15:40:28.270: E/AndroidRuntime(24104): Caused by: java.lang.reflect.InvocationTargetException
04-25 15:40:28.270: E/AndroidRuntime(24104):    at java.lang.reflect.Constructor.constructNative(Native Method)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.view.LayoutInflater.createView(LayoutInflater.java:594)
04-25 15:40:28.270: E/AndroidRuntime(24104):    ... 24 more
04-25 15:40:28.270: E/AndroidRuntime(24104): Caused by: java.lang.NullPointerException
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.widget.AutoCompleteTextView$PassThroughClickListener.access$302(AutoCompleteTextView.java:1242)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.widget.AutoCompleteTextView.setOnClickListener(AutoCompleteTextView.java:200)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.view.View.<init>(View.java:3797)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.widget.TextView.<init>(TextView.java:623)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.widget.EditText.<init>(EditText.java:60)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.widget.AutoCompleteTextView.<init>(AutoCompleteTextView.java:137)
04-25 15:40:28.270: E/AndroidRuntime(24104):    at android.widget.AutoCompleteTextView.<init>(AutoCompleteTextView.java:133)
04-25 15:40:28.270: E/AndroidRuntime(24104):    ... 27 more


com.agict.marswin.SearchPage.onCreate(SearchPage.java:39)指向我的setContentView()函数中的onCreate()调用的位置。

很抱歉,但是我找不到任何错误,因为我正确地声明了该函数,并且Java文件中没有XML需要的内容。

我很困惑,我不知道如何进行。我将不胜感激任何指导和帮助。谢谢。

最佳答案

我没有在XML中声明onClick,而是在Java File中声明了它。在我的onCreate()中,我这样做:

    brandACTV = (AutoCompleteTextView) findViewById(R.id.actvBrand);
    itemACTV = (AutoCompleteTextView) findViewById(R.id.actvItemName);
    partACTV = (AutoCompleteTextView) findViewById(R.id.actvPart);
    barcodeACTV = (AutoCompleteTextView) findViewById(R.id.actvBarcode);

    brandACTV.setOnClickListener(actvClicked);
    itemACTV.setOnClickListener(actvClicked);
    partACTV.setOnClickListener(actvClicked);
    barcodeACTV.setOnClickListener(actvClicked);


我声明了一个名为actvClicked的OnClickListener函数,如下所示:

OnClickListener actvClicked = new OnClickListener(){
    @Override
    public void onClick(View view){
        switch (view.getId()) {
            case R.id.actvBrand:
                Log.d("Hi", "Brand pressed");
                break;

            case R.id.actvItemName:
                Log.d("Hi", "Item name pressed");
                break;

            case R.id.actvPart:
                Log.d("Hi", "Part pressed");
                break;

            case R.id.actvBarcode:
                Log.d("Hi", "Barcode pressed");
                break;
        }
    }
};


但是,我现在的问题是,在触发onClickListener之前,我必须按两次它们中的任何一个。

09-28 13:04