Android自定义TextView实现设置文字之间的距离

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、效果图片如下

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);
    }
}