Project Notes for Android Development

Get resource ID by resource name

int resId = myContext.getResources().getIdentifier("resouces_name",
"drawable",
myContext.getPackageName());
myVoice.setImageResource(resId);

API：
getIdentifier()

Use of JumpingBeans

implementation 'net.frakbot:jumpingbeans:1.3.0'

        TextView textView=findViewById(R.id.textViewer);
        jumpingBeans= JumpingBeans.
                with(textView).
                //设置全部字数跳动
                makeTextJump(0,textView.getText().length()).
                //设置第一至第五个字数跳动
                //makeTextJump(0,5).
                setIsWave(true).
                //毫秒为单位
                setLoopDuration(800).
                build();

Part of the source code is:

  public static Builder with(@NonNull TextView textView) {
        return new Builder(textView);
    }

   public Builder makeTextJump(int startPos, int endPos) {
            CharSequence text = textView.getText();
            ensureTextCanJump(startPos, endPos, text);

            this.text = text;
            this.wave = true;
            this.startPos = startPos;
            this.endPos = endPos;

            return this;
       }

Judge the validity of startPos, endPos and text

    private static CharSequence ensureTextCanJump(int startPos, int endPos, CharSequence text) {
        if (text == null) {
            throw new NullPointerException("The textView text must not be null");
        }
        if (endPos < startPos) {
            throw new IllegalArgumentException("The start position must be smaller than the end position");
        }
        if (startPos < 0) {
            throw new IndexOutOfBoundsException("The start position must be non-negative");
        }
        if (endPos > text.length()) {
            throw new IndexOutOfBoundsException("The end position must be smaller than the text length");
        }
        return text;
    }

  public Builder setIsWave(boolean wave) {
            this.wave = wave;
            return this;
        }

   public JumpingBeans build() {
            SpannableStringBuilder sbb = new SpannableStringBuilder(text);
            JumpingBeansSpan[] spans;
            if (wave) {
                spans = getJumpingBeansSpans(sbb);
            } else {
                spans = buildSingleSpan(sbb);
            }

            textView.setText(sbb);
            return new JumpingBeans(spans, textView);
        }

This method should be called at the end, otherwise it is easy to leak memory

  public void stopJumping() {
        for (JumpingBeansSpan bean : jumpingBeans) {
            if (bean != null) {
                bean.teardown();
            }
        }

        cleanupSpansFrom(textView.get());
    }

Github:
JumpingBeans