【Android Widget】1.TextView

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1.创建可被点击的TextView

1.1 在xml中创建可被点击的TextView

android:autoLink 是否将符合指定格式的文本转换成可单击的超链接。

属性值可以是如下几个属性值的一个或多个，多个属性值之间用竖线隔开。

none：不设置任何超链接。
web：将文本中的URL地址转换为超链接。
email：将文本中的email地址转换为超链接。
phone：
map：将文本中地址转换为超链接。
all：全部转换为超链接。

link_text_auto

<string name="link_text_auto">text1: Various kinds
of data that will be auto-linked. In
this text are some things that are actionable. For instance,
you can click on http://www.google.com and it will launch the
web browser. You can click on google.com too. If you
click on (415) 555-1212 it should dial the phone. Or just write
foobar@example.com for an e-mail link. If you have a URI like
http://www.example.com/lala/foobar@example.com you should get the
full link not the e-mail address. Or you can put a location
like 1600 Amphitheatre Parkway, Mountain View, CA 94043. To summarize:
https://www.google.com, or 650-253-0000, somebody@example.com,
or 9606 North MoPac Expressway, Suite 400, Austin, TX 78759.
</string>

1.2 在代码调用setMovemoentMethod()方法设置超链接被点击：

TextView t2 = (TextView) findViewById(R.id.text2);
t2.setMovementMethod(LinkMovementMethod.getInstance());

link_text_manual

<string name="link_text_manual">text2: Explicit links using <a> markup.
This has markup for a <a href="http://www.google.com">link</a> specified
via an <a> tag. Use a \"tel:\" URL
to <a href="tel:4155551212">dial a phone number</a>.
</string>

1.3 使用代码中使用html创建带超链接的文本

TextView t3 = (TextView) findViewById(R.id.text3);
t3.setText(
Html.fromHtml(
"text3: Constructed from HTML programmatically. Text with a " +
"<a href=\"http://www.google.com\">link</a> " +
"created in the Java source code using HTML."));
t3.setMovementMethod(LinkMovementMethod.getInstance());

1.4 代码中不使用html创建带超链接的文本

SpannableString：http://orgcent.com/android-textview-spannablestring-span/http://developer.android.com/reference/android/text/style/CharacterStyle.html

SpannableString ss = new SpannableString(
"text4: Manually created spans. Click here to dial the phone."); ss.setSpan(new StyleSpan(Typeface.BOLD), 0, 30,
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
ss.setSpan(new URLSpan("tel:4155551212"), 31+6, 31+10,
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); TextView t4 = (TextView) findViewById(R.id.text4);
t4.setText(ss);
t4.setMovementMethod(LinkMovementMethod.getInstance());

1.5 点击部分TextView跳转到另外一个Activity

有时候我们需要实现点击部分TextView跳转到另外一个Activity比如微博中的@功能。

通过跟踪TextView的源码，我们发现TextView支持的链接是由android.text.style.URLSpan这个类实现的，它重写了一个onClick方法：

@Override
public void onClick(View widget) {
Uri uri = Uri.parse(getURL());
Context context = widget.getContext();
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
intent.putExtra(Browser.EXTRA_APPLICATION_ID, context.getPackageName());
context.startActivity(intent);
}

大家看到了吧startActivity，多么熟悉的方法。既然它能实现，为什么我们不能呢，答案是可以的。我们接着跟踪代码，可以看到URLSpan其实继承的是android.text.style.ClickableSpan，我们来看一下他的源码：

/**
* If an object of this type is attached to the text of a TextView
* with a movement method of LinkMovementMethod, the affected spans of
* text can be selected. If clicked, the {@link #onClick} method will
* be called.
*/
public abstract class ClickableSpan extends CharacterStyle implements UpdateAppearance { /**
* Performs the click action associated with this span.
*/
public abstract void onClick(View widget); /**
* Makes the text underlined and in the link color.
*/
@Override
public void updateDrawState(TextPaint ds) {
ds.setColor(ds.linkColor);
ds.setUnderlineText(true);
}
}

我们直接继承这个类，重写他的方法就可以了

实例：点击文本中的每一个字母跳转到另一个Activity并显示

效果：

点击The 则进入OtherActivity

自定义MyURLSpan

public class MyURLSpan extends ClickableSpan { private final String tag; public MyURLSpan(String tag) {
// TODO Auto-generated constructor stub
this.tag = tag;
} @Override
public void updateDrawState(TextPaint ds) {
//设置字体颜色
ds.setColor(Color.BLUE);
//去掉下划线
ds.setUnderlineText(false);
} @Override
public void onClick(View widget) {
Context context = widget.getContext();
Intent intent = new Intent(context, OtherActivity.class);
intent.putExtra("tag", tag);
context.startActivity(intent); }}

使用MyURLSpan

public class MainActivity extends Activity {
private final String str = "The Obama administration said Wednesday it would take action against the Syrian government even without the backing of allies or the United Nations because diplomatic paralysis must not prevent a response to the alleged chemical weapons attack"
+ " outside the Syrian capital last week "; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SpannableString ss = new SpannableString(str);
int fromIndex = 0;
while (str.indexOf(" ", fromIndex) != -1) {
int endIndex = str.indexOf(" ", fromIndex);
ss.setSpan(new MyURLSpan(str.substring(fromIndex, endIndex)), fromIndex, endIndex,
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
fromIndex = endIndex + 1;
}
TextView tv = (TextView) findViewById(R.id.tv);
tv.setText(ss);
tv.setMovementMethod(LinkMovementMethod.getInstance());
}}