如何在android中修复ArithmeticException错误

其实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。 此程序显示错误“java.lang.ArithmeticException：除以零”错误程序具有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）下方还有另一个按钮（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 

Answer 1

这行代码导致错误。 这是我在提到这个链接后所理解的

 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); 

Answer 2

它必须做一些与setStretchAllColumns和宽度设置相关的事情，因为有一些内部的android计算会导致exception。 只需使用抛出exception的方法签出grepcode，您就会有更好的想法。