Android_layout_Button使用

Button使用

1.布局文件layout文件中定义的Button按钮

 <Button
     android:id="@+id/bt_add_black_number"//定义id
     android:layout_width="wrap_content"//包裹内容
     android:layout_height="wrap_content"//包裹内容
     android:layout_marginLeft="20dip"//按钮外边的左边距离另一个控件的距离
     android:background="@drawable/button_selector"//背景颜色在另一个文件中定义
     android:text="添加"
     android:textColor="#FFF8F8F8"
     android:textSize="20sp"
 />

2.在Activity中使用Button

bt_add_black_number = (Button) this.findViewById(R.id.bt_add_black_number);
        
bt_add_black_number.setOnClickListener(new OnClickListener() {
            
    public void onClick(View v) {
        AlertDialog.Builder builder = new Builder(CallSmsActivity.this);
        builder.setTitle("添加黑名单号码");
        final EditText et = new EditText(CallSmsActivity.this);
                et.setInputType(InputType.TYPE_CLASS_PHONE);
        builder.setView(et);
        builder.setPositiveButton("添加", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                        String number =  et.getText().toString().trim();
                        if(TextUtils.isEmpty(number)){
                            Toast.makeText(getApplicationContext(), "黑名单号码不能为空", 1).show();
                            return ;
                        }else{
                            dao.add(number);
                            //todo: 通知listview更新数据
                            // 缺点: 重新刷新整个listview 
//                            numbers = dao.getAllNumbers();
//                            lv_call_sms_safe.setAdapter(new ArrayAdapter<String>(CallSmsActivity.this, R.layout.blacknumber_item, R.id.tv_blacknumber_item, numbers));
                            numbers = dao.getAllNumbers();
                            
                            // 让数据适配器通知listview更新数据 
                            adapter.notifyDataSetChanged();
                        
                        }
                        
                    }
                });
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    
                    public void onClick(DialogInterface dialog, int which) {
                        
                    }
                });
                builder.create().show();
            }
        });
        numbers = dao.getAllNumbers();
        //adapter = new ArrayAdapter<String>(this, R.layout.blacknumber_item, R.id.tv_blacknumber_item, numbers);
        adapter = new CallSmsAdapter();
        
        lv_call_sms_safe.setAdapter(adapter);
    
    
    
    }