java – 如何修复android中的ArithmeticException错误
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内容图文
实际上我不知道问题在哪里.我认为它必须在创建TableLayout.
我不知道如何修复错误并使应用程序工作.
该程序显示错误“java.lang.ArithmeticException：除以零”错误
该程序具有EditText(edText),它要求用户输入.
它的类型是NUMBER.(这里r是来自edText的值)
在EditText下面有一个Button(bt),它显示edText值.
在按钮(bt)下面有另一个按钮(bt1),它再次显示edText值.
此按钮还必须显示r行和4列EditText视图,即用户必须在EditText中输入r * 4输入数据.
我无法清除错误,我不知道如何清除该错误.
public class Ybus_Activity extends Activity {
int i;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ybus);
final LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT);
final LinearLayout main = (LinearLayout)findViewById(R.id.android_main_layout);
TextView getData=new TextView(this);
getData.setText("Enter the number of LineData : ");
getData.setId(5);
getData.setLayoutParams(params);
main.addView(getData);
final EditText edText = new EditText(this);
edText.setId(3);
edText.setLayoutParams(params);
edText.setWidth(100);
edText.setImeOptions(EditorInfo.IME_ACTION_NEXT);
edText.setInputType(InputType.TYPE_CLASS_NUMBER);
edText.setKeyListener(DigitsKeyListener.getInstance());
edText.setMaxLines(1);
main.addView(edText );
Button bt = new Button(this);
bt.setText("Click to enter Linedata");
bt.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
main.addView(bt);
final TextView text = new TextView(this);
bt.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
String ed=edText.getText().toString();
try{
i =Integer.parseInt(ed);
//setting value here
text.setText(i+"");
//or you can do like this
//text.setText(String.valueOf(i));
}catch(NumberFormatException ex){
text.setText("Value at TextView is not a valid integer");
}
}
});
main.addView(text);
final TextView text2 = new TextView(this);
Button two = new Button(this);
two.setText("Second");
main.addView(two);
main.addView(text2);
two.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
text2.setText(String.valueOf(i));
main.addView(createTL(i,getBaseContext()));
System.out.println(+i);
}
});
}
public static TableLayout createTL(int r, Context context)
{
int c=4;
LayoutParams params = new
LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);
TableLayout tl = new TableLayout(context);
tl.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT,TableRow.LayoutParams.WRAP_CONTENT));
tl.setStretchAllColumns(true);
TableRow[] tr = new TableRow[r];
EditText[][] et = new EditText[r][c];
for(int i=0;i<r;i++)
{
System.out.println("line i called" + i);
tr[i] = new TableRow(context);
for(int j=0;j<4;j++)
{
et[i][j] = new EditText(context);
et[i][j].setText("o.oo");
et[i][j].setLayoutParams(params);
et[i][j].setWidth(100);
et[i][j].setImeOptions(EditorInfo.IME_ACTION_NEXT);
et[i][j].setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL);
et[i][j].setKeyListener(DigitsKeyListener.getInstance());
et[i][j].setMaxLines(1);
System.out.println("EditText is created" + i + j);
tr[i].addView(et[i][j]);
System.out.println("Tr is created" + i);
}
tl.addView(tr[i]);
System.out.println("TLL is created" + i);
}
return tl;
}
}
我的Logcat：
02-23 12:56:36.147: I/System.out(1742): line i called0
02-23 12:56:36.155: I/System.out(1742): EditText is created00
02-23 12:56:36.155: I/System.out(1742): Tr is created0
02-23 12:56:36.186: I/System.out(1742): EditText is created01
02-23 12:56:36.186: I/System.out(1742): Tr is created0
02-23 12:56:36.195: I/System.out(1742): EditText is created02
02-23 12:56:36.206: I/System.out(1742): Tr is created0
02-23 12:56:36.206: I/System.out(1742): EditText is created03
02-23 12:56:36.215: I/System.out(1742): Tr is created0
02-23 12:56:36.225: I/System.out(1742): TLL is created0
02-23 12:56:36.225: I/System.out(1742): line i called1
02-23 12:56:36.235: I/System.out(1742): EditText is created10
02-23 12:56:36.235: I/System.out(1742): Tr is created1
02-23 12:56:36.245: I/System.out(1742): EditText is created11
02-23 12:56:36.245: I/System.out(1742): Tr is created1
02-23 12:56:36.265: I/System.out(1742): EditText is created12
02-23 12:56:36.265: I/System.out(1742): Tr is created1
02-23 12:56:36.275: I/System.out(1742): EditText is created13
02-23 12:56:36.275: I/System.out(1742): Tr is created1
02-23 12:56:36.275: I/System.out(1742): TLL is created1
02-23 12:56:36.285: I/System.out(1742): 2
02-23 12:56:36.285: D/AndroidRuntime(1742): Shutting down VM
02-23 12:56:36.285: W/dalvikvm(1742): threadid=1: thread exiting with uncaught exception (group=0xb2f97288)
02-23 12:56:36.305: E/AndroidRuntime(1742): FATAL EXCEPTION: main
02-23 12:56:36.305: E/AndroidRuntime(1742): java.lang.ArithmeticException: divide by zero
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.widget.TableLayout.mutateColumnsWidth(TableLayout.java:583)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.widget.TableLayout.shrinkAndStretchColumns(TableLayout.java:572)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.widget.TableLayout.measureVertical(TableLayout.java:470)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.widget.TableLayout.onMeasure(TableLayout.java:435)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.View.measure(View.java:15172)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.View.measure(View.java:15172)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.View.measure(View.java:15172)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.widget.LinearLayout.measureVertical(LinearLayout.java:833)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.View.measure(View.java:15172)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
02-23 12:56:36.305: E/AndroidRuntime(1742): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.View.measure(View.java:15172)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1848)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1100)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1273)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.Choreographer.doCallbacks(Choreographer.java:555)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.Choreographer.doFrame(Choreographer.java:525)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.os.Handler.handleCallback(Handler.java:615)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.os.Handler.dispatchMessage(Handler.java:92)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.os.Looper.loop(Looper.java:137)
02-23 12:56:36.305: E/AndroidRuntime(1742): at android.app.ActivityThread.main(ActivityThread.java:4745)
02-23 12:56:36.305: E/AndroidRuntime(1742): at java.lang.reflect.Method.invokeNative(Native Method)
02-23 12:56:36.305: E/AndroidRuntime(1742): at java.lang.reflect.Method.invoke(Method.java:511)
02-23 12:56:36.305: E/AndroidRuntime(1742): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
02-23 12:56:36.305: E/AndroidRuntime(1742): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-23 12:56:36.305: E/AndroidRuntime(1742): at dalvik.system.NativeStart.main(Native Method)
02-23 12:56:36.425: D/dalvikvm(1742): GC_CONCURRENT freed 162K, 3% free 11001K/11271K, paused 24ms+27ms, total 107ms
解决方法:
这行代码导致错误.这是我在提到这个link后所理解的
int c=4;
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT); //this is causing the error
tl.setStretchAllColumns(true);
您需要将其更改为
TableRow.LayoutParams params = new TableRow.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);
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