TextView Text Collapse Two

There is a bug in the previous article, I will come again

1. Create a layout collapsible_textview_layout.xml

The layout can be modified by its own style

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dip">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="left"
        android:gravity="left"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/desc_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center_vertical"
            android:lineSpacingExtra="3dp"
            android:text="asdasd"
            android:textColor="#4A4A4A"
            android:textSize="12sp" />
    </LinearLayout>
    <LinearLayout
        android:id="@+id/desc_op_ll"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="right"
        >
        <TextView
            android:id="@+id/desc_op_iv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="expand" />
    </LinearLayout>
</LinearLayout>

2. After the layout is created, start writing custom controls. First get the required layout in the constructor.

public class CollapsibleTextView extends LinearLayout implements View.OnClickListener{

    //Specify the maximum number of lines of text
    private int TEXT_MAX_LINE = 3;
    // Is it collapsible
    private boolean IS_COLLAPSIBLE;
    // Is it already folded
    private boolean COLLAPSIBLE;
    / / The first start to enter the onLayout method mark
    private boolean flag;

    // drop down arrow layout
    private LinearLayout llDescOp;
    // drop down arrow
    private TextView ivDescOp;
    //text content
    private TextView tvDesc;
     //Listen to the click event of the drop-down arrow, and respond accordingly by judging the state of the text box
    class InnerRunnable implements Runnable{

        @Override
        public void run() {
            if(IS_COLLAPSIBLE && COLLAPSIBLE){
                // Collapsible and already collapsed -- text expands
                tvDesc.setMaxLines(Integer.MAX_VALUE);
//                ivDescOp.setImageResource(R.mipmap.ic_launcher_round);
                ivDescOp.setText("Retract");
                COLLAPSIBLE = false;
                flag = true;
            }else if(IS_COLLAPSIBLE && !COLLAPSIBLE){
                // Collapsible but not collapsing -- text collapsing
                tvDesc.setMaxLines(TEXT_MAX_LINE);
//                ivDescOp.setImageResource(R.mipmap.ic_launcher);
                ivDescOp.setText("Expand");
                COLLAPSIBLE = true;
                flag = true;
            }
        }
    }

    public CollapsibleTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        //Get the layout of the view
        View view = inflate(context, R.layout.collapsible_textview_layout,this);
        tvDesc = (TextView) view.findViewById(R.id.desc_tv);
        llDescOp = (LinearLayout) view.findViewById(R.id.desc_op_ll);
        ivDescOp = (TextView) findViewById(R.id.desc_op_iv);
        llDescOp.setOnClickListener(this);
    }

    public CollapsibleTextView(Context context) {
        super(context);
    }

    //Set the content method of the text for the caller to use.
    public void setText(String text){
        tvDesc.setText(text);
        requestLayout();
    }

    //The obtained layout is added to the control
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        //initialization code
        //flag is used to mark subsequent operations without the following code
        if(!flag){
            //The number of lines of text is greater than the specified value, collapse and display the drop-down arrow
            if(tvDesc.getLineCount() > TEXT_MAX_LINE){
                tvDesc.setMaxLines(TEXT_MAX_LINE);
                llDescOp.setVisibility(VISIBLE);
                IS_COLLAPSIBLE = true;
                COLLAPSIBLE = true;
            }else{
                llDescOp.setVisibility(GONE);
                IS_COLLAPSIBLE = false;
            }
        }
    }

    @Override
    public void onClick(View view) {
        post(new InnerRunnable());
    }
}

3. Reference this control in our layout activity_main. Pay attention to the format and write the path of the full control.

<com.guorentong.learn.textviewzhedie.CollapsibleTextView
    android:id="@+id/CollapsibleTextView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
</com.guorentong.learn.textviewzhedie.CollapsibleTextView>

4. Code call settings

collapsibleTextView = (CollapsibleTextView) findViewById(R.id.CollapsibleTextView);
//Set the text to appear
collapsibleTextView.setText("文本");