Android TextView multi-text collapse expansion effect

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 xmlns:andro
 xmlns:more="/apk/res-auto"
 xmlns:tools="/tools"
 android:
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 tools:context="">

 <TextView
 android:
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:textColor="@android:color/black"
 android:textSize="18sp">
 </TextView>

 <RelativeLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content">

 <TextView
 android:
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="More"
 android:textSize="18sp"
 android:visibility="gone"/>

 <ImageView
 android:
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignParentRight="true"
 android:paddingBottom="5dip"
 android:paddingLeft="5dip"
 android:paddingRight="5dip"
 android:paddingTop="5dip"
 android:src="@drawable/ic_expand_more_red_700_24dp"
 android:visibility="gone"
 />
 </RelativeLayout>
 <!-- The second method -->
 <
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:ellipsize="end"
 more:maxLine="2"
 more:text="@string/text"
 more:textColor="@android:color/black"
 more:textSize="18dip">
 </>
</LinearLayout>

package ;

import .;
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public class MainActivity extends AppCompatActivity implements  {

 TextView text1;
 ImageView mImageView1;
 TextView expandText;
 //TextMoreTextView text2;

 boolean isExpand;//Is the expanded status private int maxDescripLine = 3; //TextView default maximum number of display lines private int deltaValue;//Default height, that is, the height determined by maxLine in the front private int startValue;//Start height private int durationMillis = 350;//Duration of animation
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 (savedInstanceState);
 setContentView(.activity_main);
 text1 = (TextView) findViewById(.textView1);
 // text2= (TextMoreTextView) findViewById(.text_textView);
 expandText = (TextView) findViewById(.expand_text);

 mImageView1 = (ImageView) findViewById(.expand_view1);
 (this);

 (getText());
 //The second type can be directly set here // (getText());
 // Here you can set the height of the text according to the actual situation and make a judgment (it may be that there is only one line of the text, and it will also occupy the maxDescriptLine line) (() * maxDescripLine);
 (new Runnable() {
 @Override
 public void run() {
 (() > maxDescripLine ?  : );
 (() > maxDescripLine ?  : );
 }
 });
 }

 @Override
 public void onClick(View v) {
 switch (()) {
 case .expand_view1:
 zheDie(text1, mImageView1);
 break;
 }

 }

 private void zheDie(final TextView text, ImageView imageView) {
 isExpand = !isExpand;
 ();
 startValue = ();
 if (isExpand) {
 /**
  * Folding animation
  * Retract the starting height from the actual height
  */
 deltaValue = () * () - startValue;
 RotateAnimation animation = new RotateAnimation(0, 180, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
 (durationMillis);
 (true);
 (animation);
 ("Collapse");
 } else {
 /**
  * Expand animation
  *Grow from the starting height to the actual height
  */
 deltaValue = () * maxDescripLine - startValue;
 RotateAnimation animation = new RotateAnimation(180, 0, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
 (durationMillis);
 (true);
 (animation);
 ("More");
 }
 Animation animation = new Animation() {
 protected void applyTransformation(float interpolatedTime, Transformation t) { //Show the textview height according to the percentage of ImageView rotation animation to achieve animation effect ((int) (startValue + deltaValue * interpolatedTime));
 }
 };
 (durationMillis);
 (animation);
 }
}

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <declare-styleable name="MoreTextStyle">
 <attr name="textSize" format="dimension"/>
 <attr name="textColor" format="color"/>
 <attr name="maxLine" format="integer" />
 <attr name="text" format="string" />
 </declare-styleable>
</resources>

package ;

import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
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import ;

public class TextMoreTextView extends LinearLayout {
 protected TextView contentView;
 protected ImageView expandView;

 protected int textColor;
 protected float textSize;
 protected int maxLine;
 protected String text;

 public int defaultTextColor = ;//Default text color public int defaultTextSize = 12; //Default text size public int defaultLine = 3; //Default number of rows
 public TextMoreTextView(Context context, AttributeSet attrs) {
 super(context, attrs);
 initalize();
 initWithAttrs(context, attrs);
 // bindListener();
 }

 protected void initWithAttrs(Context context, AttributeSet attrs) {
 TypedArray a = (attrs,
 );
 int textColor = (.MoreTextStyle_textColor,
 defaultTextColor);
 textSize = (.MoreTextStyle_textSize, defaultTextSize);
 maxLine = (.MoreTextStyle_maxLine, defaultLine);
 text = (.MoreTextStyle_text);
 bindTextView(textColor, textSize, maxLine, text);
 ();
 }

 protected void initalize() {
 setOrientation(VERTICAL);
 setGravity();
 contentView = new TextView(getContext());
 addView(contentView, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
 expandView = new ImageView(getContext());
 int padding = dip2px(getContext(), 5);
 (padding, padding, padding, padding);
 (.ic_expand_more_red_700_24dp);
 LayoutParams llp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
 addView(expandView, llp);
 }

 protected void bindTextView(int color, float size, final int line, String text) {
 (color);
 (TypedValue.COMPLEX_UNIT_PX, size);
 (text);
 ViewTreeObserver observer = ();
 (new () {
 //Judge that you can get () when written in this method, otherwise 0 will be returned; @Override
 public void onGlobalLayout() {
 ViewTreeObserver obs = ();
 (this);
 if (() < line) {
 (() * ());
 } else {
 (() * line);
 bindListener();//This method will be executed only if the number of rows is greater than the set number of rows. If the adjustment is made, there will be bugs. }
 //("aaa", "bindTextView111: " + ());//Return 0, why }
 });

 post(new Runnable() {
 @Override
 public void run() {
 (() > line ?  : );
 //("aaa", "run: "+() );
 }
 });
 }

 protected void bindListener() {
 setOnClickListener(new OnClickListener() {
 boolean isExpand;

 @Override
 public void onClick(View v) {
 isExpand = !isExpand;
 ();
 final int deltaValue;
 final int startValue = ();
 int durationMillis = 350;
 if (isExpand) {
 deltaValue = () * () - startValue;
 RotateAnimation animation = new RotateAnimation(0, 180, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
 (durationMillis);
 (true);
 (animation);
 } else {
 deltaValue = () * maxLine - startValue;
 RotateAnimation animation = new RotateAnimation(180, 0, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
 (durationMillis);
 (true);
 (animation);
 }
 Animation animation = new Animation() {
 protected void applyTransformation(float interpolatedTime, Transformation t) {
 ((int) (startValue + deltaValue * interpolatedTime));
 }

 };
 (durationMillis);
 (animation);
 }
 });
 }

 public TextView getTextView() {
 return contentView;
 }

 public void setText(CharSequence charSequence) {
 (charSequence);
 }

 public static int dip2px(Context context, float dipValue) {
 final float scale = ().getDisplayMetrics().density;
 return (int) (dipValue * scale + 0.5f);
 }
}