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Android系统中TextView默认显示中文时会比较紧凑、不是很美观、但是有时候我们需要在TextView的文本之间有间距、就需要自定义TextView 来实现了、可不是敲空格能实现的、下面这个Demo就是一个自定义的View实现了TextView的间距问题
SpacingTextView代码
public class SpacingTextView extends TextView{
private float letterSpacing = LetterSpacing.BIGGEST;
private CharSequence originalText = "";
public SpacingTextView(Context context) {
super(context);
}
public SpacingTextView(Context context, AttributeSet attrs){
super(context, attrs);
originalText = super.getText();
applyLetterSpacing();
this.invalidate();
}
public SpacingTextView(Context context, AttributeSet attrs, int defStyle){
super(context, attrs, defStyle);
}
public float getLetterSpacing() {
return letterSpacing;
}
public void setLetterSpacing(float letterSpacing) {
this.letterSpacing = letterSpacing;
applyLetterSpacing();
}
@Override
public void setText(CharSequence text, BufferType type) {
originalText = text;
applyLetterSpacing();
}
@Override
public CharSequence getText() {
return originalText;
}
/**
* 字距为任何字符串(技术上,一个简单的方法为CharSequence不使用)的TextView
*/
private void applyLetterSpacing() {
if (this == null || this.originalText == null) return;
StringBuilder builder = new StringBuilder();
for(int i = 0; i < originalText.length(); i ) {
String c = "" originalText.charAt(i);
builder.append(c.toLowerCase());
if(i 1 < originalText.length()) {
builder.append("u00A0");
}
}
SpannableString finalText = new SpannableString(builder.toString());
if(builder.toString().length() > 1) {
for(int i = 1; i < builder.toString().length(); i =2) {
finalText.setSpan(new ScaleXSpan((letterSpacing 1)/10), i, i 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
super.setText(finalText, BufferType.SPANNABLE);
}
public class LetterSpacing {
public final static float NORMAL = 0;
public final static float NORMALBIG = (float)0.025;
public final static float BIG = (float)0.05;
public final static float BIGGEST = (float)0.2;
}
}
调用方式
public class MainActivity extends AppCompatActivity {
private SpacingTextView mSpacingTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSpacingTextView = (SpacingTextView) findViewById(R.id.space_text);
mSpacingTextView.setText(getResources().getString(R.string.test));
//Or any float. To reset to normal, use 0 or LetterSpacingTextView.Spacing.NORMAL
mSpacingTextView.setLetterSpacing(10);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}