我的android笔记

做下记录，每次遇到的问题和解决方法，备忘。

1.去掉标题栏
android:theme="@android:style/Theme.NoTitleBar"

2.弹出警告框

AlertDialog.Builder builder= new AlertDialog.Builder(this);

                builder.setTitle("测试");

                builder.setMessage("点击测试成功");

                builder.setPositiveButton("确认", null);

                builder.create().show();

 .setPositiveButton("确定", new DialogInterface.OnClickListener() {

       public void onClick(DialogInterface dialog, int whichButton) {

        setResult(RESULT_OK);//确定按钮事件

        finish();

        }

        })

        .setNegativeButton("取消", new DialogInterface.OnClickListener() {

       public void onClick(DialogInterface dialog, int whichButton) {

        //取消按钮事件

        }

        }) 

3.用户名和密码自动补全

http://lib.open-open.com/view/open1333356387467.html

4.toast介绍

和Dialog不一样的是，Toast是没有焦点的，而且Toast显示的时间有限，过一定的时间就会自动消失。

一般的

Toast.makeText(getApplicationContext(), "默认Toast样式",Toast.LENGTH_SHORT).show();

带位置的

toast = Toast.makeText(getApplicationContext(),"自定义位置Toast", Toast.LENGTH_LONG);
   toast.setGravity(Gravity.CENTER, 0, 0);
   toast.show();

带图片的

toast = Toast.makeText(getApplicationContext(),
     "带图片的Toast", Toast.LENGTH_LONG);
   toast.setGravity(Gravity.CENTER, 0, 0);
   LinearLayout toastView = (LinearLayout) toast.getView();
   ImageView imageCodeProject = new ImageView(getApplicationContext());
   imageCodeProject.setImageResource(R.drawable.icon);
   toastView.addView(imageCodeProject, 0);
   toast.show();

自定义

LayoutInflater inflater = getLayoutInflater();
   View layout = inflater.inflate(R.layout.custom,
     (ViewGroup) findViewById(R.id.llToast));
   ImageView image = (ImageView) layout
     .findViewById(R.id.tvImageToast);
   image.setImageResource(R.drawable.icon);
   TextView title = (TextView) layout.findViewById(R.id.tvTitleToast);
   title.setText("Attention");
   TextView text = (TextView) layout.findViewById(R.id.tvTextToast);
   text.setText("完全自定义Toast");
   toast = new Toast(getApplicationContext());
   toast.setGravity(Gravity.RIGHT | Gravity.TOP, 12, 40);
   toast.setDuration(Toast.LENGTH_LONG);
   toast.setView(layout);
   toast.show();

5.带链接的textview

1.xml中加入

TextView myTextView=(TextView)findViewById(R.id.textView2);

           myTextView.setText("www.baidu.com");

Xml中加入android:autoLink="all|web"

2.

此时一定要把

这句 android:autoLink="all|web"去掉

myTextView.setText(Html.fromHtml("" +

                "<a href=\"http://www.google.com\">点我吧点我吧</a> " ));

      myTextView.setMovementMethod(LinkMovementMethod.getInstance());

3.

改变显示效果

        //创建一个 SpannableString对象    

        SpannableString sp = new SpannableString("hgkgkjgjgkjg ");    

        //设置超链接    

        sp.setSpan(new URLSpan("http://www.baidu.com"), 0, 4, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);  

      //SpannableString对象设置给TextView    

        myTextView.setText(sp);    

        //设置TextView可点击    

        myTextView.setMovementMethod(LinkMovementMethod.getInstance());