我正在尝试在 android 中创建一系列数字，例如帕斯卡三角形。我必须在android中执行。我有 tio 动态创建 textViews 并为其分配行和列值。在这里发布我的代码。
btnShow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
LinearLayout linearLayout=new LinearLayout(getApplicationContext());
Log.d("outside","for");
List<TextView> Rows = new ArrayList<TextView>(row);
List<TextView> OuterColumns= new ArrayList<TextView>(col);
List<TextView> InnerColumns = new ArrayList<TextView>(col);
int nor=Integer.parseInt(IEdit.getText().toString());
for(row=1;row<=nor;row++)
{
Log.d("before","text");
/*LayoutParams lp = new LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);*/
text_rows = new TextView(getApplicationContext());
text_rows.setText(String.valueOf(row));
Log.d("Inside","rows");
Log.i("EditText","Number"+nor);
for(col=1;col<row-1;col++)
Log.d("Inside","col");
text_cols=new TextView(getApplicationContext());
text_cols.setText(String.valueOf(col));
for(col=row-1;col>=row;col--)
text_cols2=new TextView(getApplicationContext());
text_cols2.setText(String.valueOf(col));
linearLayout.addView(text_rows);
linearLayout.addView(text_cols);
linearLayout.addView(text_cols2);
Rows.add(text_rows);
OuterColumns.add(text_cols);
InnerColumns.add(text_cols2);
}
程序在打印 inside rows 语句后给出空指针异常而崩溃。我尝试了多种方式来创建 textViews 数组，在 for 循环中独立创建它们并添加它们。但在所有上下文中，我都得到了 nullPointerException。作为android的新手，我无法弄清楚为什么会这样？请帮帮我..提前谢谢
我什至在发布我的 logcat：
10-15 12:57:18.199: W/dalvikvm(1209): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
10-15 12:57:18.219: E/AndroidRuntime(1209): FATAL EXCEPTION: main
10-15 12:57:18.219: E/AndroidRuntime(1209): java.lang.NullPointerException
10-15 12:57:18.219: E/AndroidRuntime(1209): at com.example.pyramid_of_numbers.MainActivity$1.onClick(MainActivity.java:66)
10-15 12:57:18.219: E/AndroidRuntime(1209): at android.view.View.performClick(View.java:2408)
10-15 12:57:18.219: E/AndroidRuntime(1209): at android.view.View$PerformClick.run(View.java:8816)
10-15 12:57:18.219: E/AndroidRuntime(1209): at android.os.Handler.handleCallback(Handler.java:587)
10-15 12:57:18.219: E/AndroidRuntime(1209): at android.os.Handler.dispatchMessage(Handler.java:92)
10-15 12:57:18.219: E/AndroidRuntime(1209): at android.os.Looper.loop(Looper.java:123)
10-15 12:57:18.219: E/AndroidRuntime(1209): at android.app.ActivityThread.main(ActivityThread.java:4627)
10-15 12:57:18.219: E/AndroidRuntime(1209): at java.lang.reflect.Method.invokeNative(Native Method)
10-15 12:57:18.219: E/AndroidRuntime(1209): at java.lang.reflect.Method.invoke(Method.java:521)
10-15 12:57:18.219: E/AndroidRuntime(1209): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
10-15 12:57:18.219: E/AndroidRuntime(1209): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
10-15 12:57:18.219: E/AndroidRuntime(1209): at dalvik.system.NativeStart.main(Native Method)