嘿家伙我已经实现与动态列表,即在numpicker,即对某些事件改变了,说这可能是一个按钮,点击否则后果不堪设想。问题是,每当我切换列表从较大长度,以它的工作原理小的长度和更小的长度更大的长度是不变化,而我总是设置第一个项目为选定的项目。它崩溃。 PLS。 Help.I'm新到Android。
code:
公共类MainActivity延伸活动{ NumberPicker numPicker = NULL; 字符串值1 [] = NULL; 字符串values2 [] = NULL; 串値[] = NULL; @覆盖 保护无效的onCreate(捆绑savedInstanceState){ super.onCreate(savedInstanceState); 的setContentView(R.layout.activity_main); 值1 =新的String [] { 黄釉 红, 白色, 绿, 黑色 }; values2 =新的String [] { 芒果, 橙 }; 値=新的String [] { 类, 指针, 功能, Interafce 构造 }; numPicker =(NumberPicker)findViewById(R.id.numberPicker1); numPicker.setDisplayedValues(值1); 如果(values1.length→1) { numPicker.setMaxValue(values1.length-1); } 其他 { numPicker.setMaxValue(values1.length); } numPicker.setMinValue(0); numPicker.setValue(0); numPicker.setBackgroundColor(1); numPicker.setWrapSelectorWheel(假); numPicker.setDescendantFocusability(NumberPicker.FOCUS_BLOCK_DESCENDANTS); //在价值变动听者改变值 / * //对于色调值 numPicker.setOnValueChangedListener(新NumberPicker.OnValueChangeListener(){ @覆盖 公共无效onValueChange(NumberPicker numPic,INT ARG1,ARG2 INT){ numPickerNewVal =值[numPic.getValue()] TRIM()。 tintTemp = getSelectedTintValue(numPickerNewVal); } }); * / } 公共无效的onClick(视图v) { 开关(v.getId()) { 案例R.id.button1: 如果(values1.length→1) { numPicker.setMaxValue(values1.length-1); } 其他 { numPicker.setMaxValue(values1.length); } numPicker.setMinValue(0); numPicker.setValue(0); numPicker.setDisplayedValues(值1); 打破; 案例R.id.button2: 如果(values2.length→1) { numPicker.setMaxValue(values2.length-1); } 其他 { numPicker.setMaxValue(values2.length); } numPicker.setMinValue(0); numPicker.setValue(0); numPicker.setDisplayedValues(values2); 打破; 案例R.id.button3: 如果(values3.length→1) { numPicker.setMaxValue(values3.length-1); } 其他 { numPicker.setMaxValue(values3.length); } numPicker.setMinValue(0); numPicker.setValue(0); numPicker.setDisplayedValues(値); 打破; } }}
logcat的:
06-20 13:02:16.712:E / AndroidRuntime(16793):致命异常:主要06-20 13:02:16.712:E / AndroidRuntime(16793):java.lang.IllegalStateException:无法执行活动的方法06-20 13:02:16.712:E / AndroidRuntime(16793):在android.view.View $ 1.onClick(View.java:3606)06-20 13:02:16.712:E / AndroidRuntime(16793):在android.view.View.performClick(View.java:4211)06-20 13:02:16.712:E / AndroidRuntime(16793):在android.view.View $ PerformClick.run(View.java:17446)06-20 13:02:16.712:E / AndroidRuntime(16793):在android.os.Handler.handleCallback(Handler.java:725)06-20 13:02:16.712:E / AndroidRuntime(16793):在android.os.Handler.dispatchMessage(Handler.java:92)06-20 13:02:16.712:E / AndroidRuntime(16793):在android.os.Looper.loop(Looper.java:153)06-20 13:02:16.712:E / AndroidRuntime(16793):在android.app.ActivityThread.main(ActivityThread.java:5297)06-20 13:02:16.712:E / AndroidRuntime(16793):在java.lang.reflect.Method.invokeNative(本机方法)06-20 13:02:16.712:E / AndroidRuntime(16793):在java.lang.reflect.Method.invoke(Method.java:511)06-20 13:02:16.712:E / AndroidRuntime(16793):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:833)06-20 13:02:16.712:E / AndroidRuntime(16793):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)06-20 13:02:16.712:E / AndroidRuntime(16793):在dalvik.system.NativeStart.main(本机方法)06-20 13:02:16.712:E / AndroidRuntime(16793):由:java.lang.reflect.InvocationTargetException06-20 13:02:16.712:E / AndroidRuntime(16793):在java.lang.reflect.Method.invokeNative(本机方法)06-20 13:02:16.712:E / AndroidRuntime(16793):在java.lang.reflect.Method.invoke(Method.java:511)06-20 13:02:16.712:E / AndroidRuntime(16793):在android.view.View $ 1.onClick(View.java:3601)06-20 13:02:16.712:E / AndroidRuntime(16793):... 11个06-20 13:02:16.712:E / AndroidRuntime(16793):java.lang.ArrayIndexOutOfBoundsException:产生的原因长度= 2;指数= 406-20 13:02:16.712:E / AndroidRuntime(16793):在android.widget.NumberPicker.ensureCachedScrollSelectorValue(NumberPicker.java:1722)06-20 13:02:16.712:E / AndroidRuntime(16793):在android.widget.NumberPicker.initializeSelectorWheelIndices(NumberPicker.java:1537)06-20 13:02:16.712:E / AndroidRuntime(16793):在android.widget.NumberPicker.setMaxValue(NumberPicker.java:1345)06-20 13:02:16.712:E / AndroidRuntime(16793):在com.example.numpicker.MainActivity.onClick(MainActivity.java:85)06-20 13:02:16.712:E / AndroidRuntime(16793):... 14个
解决方案
呼叫 setDisplayedValues(空)
在 setMaxValue
在的onClick
。
Hey Guys I've been implementing the numpicker with Dynamic lists, i.e, that changes on some event , say it could be a button click or else. Problem is Whenever i switch the List From Larger Length to Smaller length it works and smaller length to bigger length it ain't changes, While i always set 1st item as selected item. It crashes. Pls. Help.I'm New to Android.
Code:
public class MainActivity extends Activity {
NumberPicker numPicker = null;
String values1[] = null;
String values2[] = null;
String values3[] = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
values1 =new String []{
"Yello",
"Red",
"White",
"Green",
"Black"
};
values2 =new String []{
"Mango",
"Orange"
};
values3 =new String []{
"Class",
"Pointer",
"Function",
"Interafce",
"Constructor"
};
numPicker = (NumberPicker)findViewById(R.id.numberPicker1);
numPicker.setDisplayedValues(values1);
if(values1.length>1)
{
numPicker.setMaxValue(values1.length-1);
}
else
{
numPicker.setMaxValue(values1.length);
}
numPicker.setMinValue(0);
numPicker.setValue(0);
numPicker.setBackgroundColor(1);
numPicker.setWrapSelectorWheel(false);
numPicker.setDescendantFocusability(NumberPicker.FOCUS_BLOCK_DESCENDANTS);
//On value change listner for changing values
/* //For Tint Values
numPicker.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker numPic, int arg1, int arg2) {
numPickerNewVal = values[numPic.getValue()].trim();
tintTemp = getSelectedTintValue(numPickerNewVal);
}
});*/
}
public void onClick(View v)
{
switch(v.getId())
{
case R.id.button1:
if(values1.length>1)
{
numPicker.setMaxValue(values1.length-1);
}
else
{
numPicker.setMaxValue(values1.length);
}
numPicker.setMinValue(0);
numPicker.setValue(0);
numPicker.setDisplayedValues(values1);
break;
case R.id.button2:
if(values2.length>1)
{
numPicker.setMaxValue(values2.length-1);
}
else
{
numPicker.setMaxValue(values2.length);
}
numPicker.setMinValue(0);
numPicker.setValue(0);
numPicker.setDisplayedValues(values2);
break;
case R.id.button3:
if(values3.length>1)
{
numPicker.setMaxValue(values3.length-1);
}
else
{
numPicker.setMaxValue(values3.length);
}
numPicker.setMinValue(0);
numPicker.setValue(0);
numPicker.setDisplayedValues(values3);
break;
}
}
}
Logcat:
06-20 13:02:16.712: E/AndroidRuntime(16793): FATAL EXCEPTION: main
06-20 13:02:16.712: E/AndroidRuntime(16793): java.lang.IllegalStateException: Could not execute method of the activity
06-20 13:02:16.712: E/AndroidRuntime(16793): at android.view.View$1.onClick(View.java:3606)
06-20 13:02:16.712: E/AndroidRuntime(16793): at android.view.View.performClick(View.java:4211)
06-20 13:02:16.712: E/AndroidRuntime(16793): at android.view.View$PerformClick.run(View.java:17446)
06-20 13:02:16.712: E/AndroidRuntime(16793): at android.os.Handler.handleCallback(Handler.java:725)
06-20 13:02:16.712: E/AndroidRuntime(16793): at android.os.Handler.dispatchMessage(Handler.java:92)
06-20 13:02:16.712: E/AndroidRuntime(16793): at android.os.Looper.loop(Looper.java:153)
06-20 13:02:16.712: E/AndroidRuntime(16793): at android.app.ActivityThread.main(ActivityThread.java:5297)
06-20 13:02:16.712: E/AndroidRuntime(16793): at java.lang.reflect.Method.invokeNative(Native Method)
06-20 13:02:16.712: E/AndroidRuntime(16793): at java.lang.reflect.Method.invoke(Method.java:511)
06-20 13:02:16.712: E/AndroidRuntime(16793): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
06-20 13:02:16.712: E/AndroidRuntime(16793): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
06-20 13:02:16.712: E/AndroidRuntime(16793): at dalvik.system.NativeStart.main(Native Method)
06-20 13:02:16.712: E/AndroidRuntime(16793): Caused by: java.lang.reflect.InvocationTargetException
06-20 13:02:16.712: E/AndroidRuntime(16793): at java.lang.reflect.Method.invokeNative(Native Method)
06-20 13:02:16.712: E/AndroidRuntime(16793): at java.lang.reflect.Method.invoke(Method.java:511)
06-20 13:02:16.712: E/AndroidRuntime(16793): at android.view.View$1.onClick(View.java:3601)
06-20 13:02:16.712: E/AndroidRuntime(16793): ... 11 more
06-20 13:02:16.712: E/AndroidRuntime(16793): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=2; index=4
06-20 13:02:16.712: E/AndroidRuntime(16793): at android.widget.NumberPicker.ensureCachedScrollSelectorValue(NumberPicker.java:1722)
06-20 13:02:16.712: E/AndroidRuntime(16793): at android.widget.NumberPicker.initializeSelectorWheelIndices(NumberPicker.java:1537)
06-20 13:02:16.712: E/AndroidRuntime(16793): at android.widget.NumberPicker.setMaxValue(NumberPicker.java:1345)
06-20 13:02:16.712: E/AndroidRuntime(16793): at com.example.numpicker.MainActivity.onClick(MainActivity.java:85)
06-20 13:02:16.712: E/AndroidRuntime(16793): ... 14 more
解决方案
Call setDisplayedValues(null)
before setMaxValue
in onClick
.
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