AlertDialog的用法

这是写在activity里的代码

 private View choseChapter;  addChapter.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                LayoutInflater inflater = (LayoutInflater) ChapterActivity.this.getSystemService(LAYOUT_INFLATER_SERVICE);                choseChapter= inflater.inflate(R.layout.course_edittext, null);                AlertDialog.Builder dialog=new AlertDialog.Builder(ChapterActivity.this);                dialog.setTitle("请输入要添加的章节名");                dialog.setView(choseChapter);                dialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                        EditText CourseNmae=(EditText)choseChapter.findViewById(R.id.c);                        String Coursename=CourseNmae.getText().toString();                        if(Coursename.isEmpty())                        {                            Toast.makeText(ChapterActivity.this, "请输入章节号", Toast.LENGTH_SHORT).show();                        }                        else {                            Course c = new Course();                            c.setName(Coursename);                            chapters.add(c);                            adapter.referesh(chapters);                        }                    }                });                dialog.setNegativeButton("取消", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                    }                });                dialog.show();            }        });

这是course_edittext的代码

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <TableLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/tableLayout1">        <TableRow            android:id="@+id/tableRow1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:padding="10dip">            <EditText                android:layout_weight="1"                android:hint="请输入课程名"                android:id="@+id/c"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                ></EditText>        </TableRow>    </TableLayout>    </LinearLayout>