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我試圖實現Yuri Kanivets的Android輪式選取器。我只是試圖在單個輪子上放置幾根琴絃。是什麼讓我的實現有點不同,我試圖在AlertDialog.Builder上顯示輪子。我可以得到一個空的輪出現在我的對話框中,但我似乎無法填充任何東西。每次我嘗試向輪子添加值時,都會收到空指針異常。實現Android Wheel的空指針
如果有人熟悉這一點,你能看到我做錯了什麼嗎?我強烈懷疑我在ArrayWheelAdapter中使用的上下文是錯誤的,但我不知道如何去做。這裏是我的代碼:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_find_events);
LayoutInflater inflater = LayoutInflater.from(this);
builderView = inflater.inflate(R.layout.wheel_range_layout, null);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setView(builderView);
alert = builder.create();
final WheelView range = (WheelView) findViewById(R.id.range);
int defaultRange = 0;
String ranges[] = new String[] {"10 miles", "25 miles", "50 miles", "Everywhere"};
ArrayWheelAdapter<String> adapter = new ArrayWheelAdapter<String>(this, ranges);
adapter.setTextSize(18);
//this next line is where it is crashing -- maybe adapter is null???
range.setViewAdapter(adapter);
range.setCurrentItem(defaultRange);
alert.show();
}
那是的。萬分感謝! – Alex