Making TextView scrollable on Android

2018-12-31 02:03发布

I am displaying text in a textview that appears to be too long to fit into one screen. I need to make my TextView scrollable. How can I do that?

Here is the code:

final TextView tv = new TextView(this);
tv.setBackgroundResource(R.drawable.splash);
tv.setTypeface(face);
tv.setTextSize(18);
tv.setTextColor(R.color.BROWN);
tv.setGravity(Gravity.CENTER_VERTICAL| Gravity.CENTER_HORIZONTAL);
tv.setOnTouchListener(new OnTouchListener() {
    public boolean onTouch(View v, MotionEvent e) {
        Random r = new Random();
        int i = r.nextInt(101);
        if (e.getAction() == e.ACTION_DOWN) {
            tv.setText(tips[i]);
            tv.setBackgroundResource(R.drawable.inner);
        }
        return true;
    }
});
setContentView(tv);

25条回答
泪湿衣
2楼-- · 2018-12-31 02:40

I had this problem when I was using TextView inside the ScrollView. This solution has worked for me.

scrollView.setOnTouchListener(new View.OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {

                description.getParent().requestDisallowInterceptTouchEvent(false);

                return false;
            }
        });

        description.setOnTouchListener(new View.OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {

                description.getParent().requestDisallowInterceptTouchEvent(true);

                return false;
            }
        });
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骚的不知所云
3楼-- · 2018-12-31 02:41

The "pro tip" above from Someone Somewhere (Making TextView scrollable on Android) works great, however, what if you're dynamically adding text to the ScrollView and would like to automatically scroll to the bottom after an append only when the user is at the bottom of the ScrollView? (Perhaps because if the user has scrolled up to read something you don't want to automatically reset to the bottom during an append, which would be annoying.)

Anyway, here it is:

if ((mTextStatus.getMeasuredHeight() - mScrollView.getScrollY()) <=
        (mScrollView.getHeight() + mTextStatus.getLineHeight())) {
    scrollToBottom();
}

The mTextStatus.getLineHeight() will make it so that you don't scrollToBottom() if the user is within one line from the end of the ScrollView.

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像晚风撩人
4楼-- · 2018-12-31 02:44

This is "How to apply ScrollBar to your TextView", using only XML.

First, you need to take a Textview control in the main.xml file and write some text into it ... like this:

<TextView
    android:id="@+id/TEXT"
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    android:text="@string/long_text"/>

Next, place the text view control in between the scrollview to display the scroll bar for this text:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent">

    <ScrollView
        android:id="@+id/ScrollView01"
        android:layout_height="150px"
        android:layout_width="fill_parent">

        <TextView
            android:id="@+id/TEXT"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:text="@string/long_text"/>

    </ScrollView>
</RelativeLayout>

That's it...

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美炸的是我
5楼-- · 2018-12-31 02:44

I struggled with this for over a week and finally figured out how to make this work!

My issue was that everything would scroll as a 'block'. The text itself was scrolling, but as a chunk rather than line by line. This obviously didn't work for me, because it would cut off lines at the bottom. All of the previous solutions did not work for me, so I crafted my own.

Here is the easiest solution by far:

Make a class file called: 'PerfectScrollableTextView' inside a package, then copy and paste this code in:

import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.widget.TextView;

public class PerfectScrollableTextView extends TextView {

    public PerfectScrollableTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        setVerticalScrollBarEnabled(true);
        setHorizontallyScrolling(false);
    }

    public PerfectScrollableTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        setVerticalScrollBarEnabled(true);
        setHorizontallyScrolling(false);
    }

    public PerfectScrollableTextView(Context context) {
        super(context);
        setVerticalScrollBarEnabled(true);
        setHorizontallyScrolling(false);
    }

    @Override
    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
        if(focused)
            super.onFocusChanged(focused, direction, previouslyFocusedRect);
    }

    @Override
    public void onWindowFocusChanged(boolean focused) {
        if(focused)
            super.onWindowFocusChanged(focused);
    }

    @Override
    public boolean isFocused() {
        return true;
    }
}

Finally change your 'TextView' in XML:

From: <TextView

To: <com.your_app_goes_here.PerfectScrollableTextView

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泛滥B
6楼-- · 2018-12-31 02:45

Add the following in the textview in XML.

android:scrollbars="vertical"

And finally, add

textView.setMovementMethod(new ScrollingMovementMethod());

in the Java file.

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孤独寂梦人
7楼-- · 2018-12-31 02:47

When you are done with scrollable, add this line to the view's last line when you enter anything in the view:

((ScrollView) findViewById(R.id.TableScroller)).fullScroll(View.FOCUS_DOWN);
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