TextView SpannableString方法 ,EditText 及监听事件,ImageView

nTextView

android:textAppearance="@style/TextAppearance.AppCompat.Large"

android:ellipsize="marquee"
android:singleLine="true"
android:focusable="true"
android:freezesText="false"
android:focusableInTouchMode="true"
android:marqueeRepeatLimit="marquee_forever"
android:scrollHorizontally="true"
android:clickable="true"

SpannableString

textView = (TextView) findViewById(R.id.test_text);
SpannableString spannableString = new SpannableString("0123456789");
spannableString.setSpan(new BackgroundColorSpan(0x00ff0000), 3, 6, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
//设置字体颜色 0x开头八位颜色位 0x00ff0000
// .Spanned.SPAN_INCLUSIVE_EXCLUSIVE  左边开区间，右边闭区间[3,6)

spannableString.setSpan(new AbsoluteSizeSpan(50), 3, 6, Spanned.SPAN_INCLUSIVE_INCLUSIVE);
//绝对大小，填写字体大小
spannableString.setSpan(new RelativeSizeSpan(2), 7,13,Spanned.SPAN_INCLUSIVE_INCLUSIVE);
//相对大小是原始字数的倍数
textView.setText(spannableString);
textView.setText(spannableString);

Button

EditoText

android:hint="I Love You"
android:inputType="text" //输入类型
android:imeOptions="actionSend" //设置回车键的样式,此时输入类型inputType要为单行的模式
android:imeActionLabel="发送"   //设置回车键为发送两个字
android:imeActionId="1"

EditoText 的监听事件

editText.setOnEditorActionListener(this);

@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (v.getId() == R.id.Test_edit) {
Toast.makeText(Main3Activity.this, "dasndkjsb", Toast.LENGTH_SHORT).show();
}
return true;
}

editText.addTextChangedListener(this);

@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {

}

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {

}

@Override
public void afterTextChanged(Editable s) {
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) != 'a') {
s.delete(i, i + 1);//如果有等于a的字符不能输入
}
}
}

ImageView

android:tint="#f00"//给图片着色
android:tintMode="add" //着色类型

android:scaleType="fitCenter"
android:adjustViewBounds="true"
//高度或宽度一个是定值另外一个是warp_content的时候自动调整大小