- TextView 添加下划线
TextView textView = findViewById(R.id.textView);
String text = "这是一段测试文字";
//方法一
textView.setText(Html.fromHtml(String.format("<u>%s</u>", text)));
//方法二
//<string name="example"><u>这是一段测试文字</u></string>}
textView.setText(R.string.example);
//方法三
textView.getPaint().setFlags(textView.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);
//方法四
SpannableString ss = new SpannableString(text);
ss.setSpan(new UnderlineSpan(), 0, text.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
textView.setText(ss);
- Webview 加载html
//加载url
webView.loadUrl("http://www.baidu.com");
//加载asset目录下html文件
webView.loadUrl("file:///android_asset/index.html");
//加载 手机内部存储或sd卡 内的html文件
webView.loadUrl("file:///storage/emulated/0/index.html");
- ListView，RecyclerView等设置具有padding的分割线
设置分割线，我们只需要提供DividerDrawable即可，示例代码如下
//ListView设置分割线
mListView.setDivider(drawable);
//RecyclerView设置分割线
DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
dividerItemDecoration.setDrawable(drawable);
mRecyclerView.addItemDecoration(dividerItemDecoration);
方式一：使用xml，drawable/divider.xml
<inset xmlns:android="http://schemas.android.com/apk/res/android"
android:insetLeft="15dp"
android:insetRight="15dp" >
<shape>
<size android:height="1dp"/>
<solid android:color="@color/color_divider" />
</shape>
</inset>
方式二：使用代码：
ShapeDrawable shapeDrawable = new ShapeDrawable();
shapeDrawable.setColorFilter(color, mode);
shapeDrawable.setIntrinsicHeight(height);
InsetDrawable drawable = new InsetDrawable(shapeDrawable, insetLeft, insetTop, insetRight, insetBottom);
- TabLayout常见用法
- 设置字体大小
定义style，如下：
<style name="TabLayoutStyle" parent="Base.Widget.Design.TabLayout">
<item name="android:textSize">12sp</item>
<item name="android:textAllCaps">true</item>
</style>
然后在xml中使用，如下：
<android.support.design.widget.TabLayout
android:id="@+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabGravity="fill"
app:tabIndicatorColor="@color/colorPrimaryDark"
app:tabIndicatorHeight="2dp"
app:tabMode="fixed"
app:tabSelectedTextColor="@color/colorPrimaryDark"
app:tabTextAppearance="@style/TabLayoutStyle"
app:tabTextColor="@color/colorGrey" />
2.设置Tab间分割线，方法如下
View root = tabLayout.getChildAt(0);
if (root instanceof LinearLayout) {
((LinearLayout) root).setShowDividers(LinearLayout.SHOW_DIVIDER_MIDDLE);
GradientDrawable drawable = new GradientDrawable();
drawable.setColor(Color.BLACK);
drawable.setSize(2, 1);
((LinearLayout) root).setDividerDrawable(drawable);
}
- 设置AppCompatRatingBar仅仅显示，不可交互
android:isIndicator="true"
-
CardView设置透明背景的问题
方法一：XML设置cardBackgroundColor属性为TRANSPARENT
方法二：代码设置setCardBackgroundColor(Color.TRANSPARENT)
方法三：代码设置setBackgroundColor(Color.TRANSPARENT)
注意：CardView在XML设置background是无效的，原因很简单，看源代码即可：
//CardView的构造函数中会调用以下代码
TypedArray a = context.obtainStyledAttributes(attrs, styleable.CardView, defStyleAttr, style.CardView);
ColorStateList backgroundColor;
if (a.hasValue(styleable.CardView_cardBackgroundColor)) {
backgroundColor = a.getColorStateList(styleable.CardView_cardBackgroundColor);
} else {
TypedArray aa = this.getContext().obtainStyledAttributes(COLOR_BACKGROUND_ATTR);
int themeColorBackground = aa.getColor(0, 0);
aa.recycle();
float[] hsv = new float[3];
Color.colorToHSV(themeColorBackground, hsv);
backgroundColor = ColorStateList.valueOf(hsv[2] > 0.5F ? this.getResources().getColor(color.cardview_light_background) : this.getResources().getColor(color.cardview_dark_background));
}
///省略...
IMPL.initialize(this.mCardViewDelegate, context, backgroundColor, radius, elevation, maxElevation);
//IMPL.initialize会调用mCardViewDelegate.setCardBackground方法
//而mCardViewDelegate.setCardBackground最终会调用CardView.this.setBackgroundDrawable(drawable)方法
由以上分析可知，在XML通过background属性设置的背景色最终会被冲掉，所以CardView在XML里设置background是无效的
//解决办法：设置Type为text/html，换行符使用</br>
try {
Intent intent = new Intent(Intent.ACTION_SENDTO);
intent.setType("text/html")
.setData(Uri.parse("mailto:"))// only email apps should handle this
.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP)
.putExtra(Intent.EXTRA_EMAIL, addresses)
.putExtra(Intent.EXTRA_SUBJECT, "SUBJECT")
.putExtra(Intent.EXTRA_TEXT, "<\\br><\\br>text<\\br>");
if (intent.resolveActivity(context.getPackageManager()) != null) {
context.startActivity(intent);
}
} catch (Exception e) {
}
