Automatisches vertikales Scrollen des Textes

Question

Wie kann automatisch bis zum Ende der Texte gescrollt werden? Dieser Code stoppt nach einer gewissen Zeit und erreicht nicht das Ende. Und ich möchte auch nach dem Klick auf den Button bis zum Ende scrollen. Etwas Hilfe würde genügen.

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:tools="http://schemas.android.com/tools" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:paddingBottom="@dimen/activity_vertical_margin" 
      android:paddingLeft="@dimen/activity_horizontal_margin" 
      android:paddingRight="@dimen/activity_horizontal_margin" 
      android:paddingTop="@dimen/activity_vertical_margin" 
      tools:context=".MainActivity" > 
<Button 
    android:id="@+id/button1" 
    style="?android:attr/buttonStyleSmall" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/textview1" 
    android:layout_alignParentRight="true" 
    android:text="OK" /> 
<ScrollView 
    android:id="@+id/scrollView1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerHorizontal="true" > 

    <TextView 
     android:text="@string/random_text" 
     android:id="@+id/textview1" 
     android:ellipsize="marquee" 
     android:marqueeRepeatLimit ="marquee_forever" 
     android:focusable="true" 
     android:scrollbars="vertical" 
     android:focusableInTouchMode="true" 
     android:maxLines="4" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content"/> 
</ScrollView> 
</RelativeLayout> 

MainActivity.java

package com.bhabani2077.autoscroll; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.Toolbar; 
import android.text.method.ScrollingMovementMethod; 
import android.view.View; 
import android.view.animation.LinearInterpolator; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ScrollView; 
import android.widget.Scroller; 
import android.widget.TextView; 

public class MainActivity extends AppCompatActivity { 
Toolbar mToolbar; 
// EditText mEditText; 
Button mButton; 
TextView mTextView; 
Scroller mScroller; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    mToolbar= (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(mToolbar); 
    // mEditText= (EditText) findViewById(R.id.editText1); 
    mButton= (Button) findViewById(R.id.button1); 
    mTextView= (TextView) findViewById(R.id.textview1); 
    mTextView.setSelected(true); 
    mTextView.setMovementMethod(new ScrollingMovementMethod()); 
    mScroller=new Scroller(MainActivity.this,new LinearInterpolator()); 
    mTextView.setScroller(mScroller); 
    mScroller.startScroll(0,0,0,500,5000); 

    mButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      //if (mEditText.getText().length()>0){ 
      // mTextView.append(mEditText.getText()+"\n"); 
      // mEditText.setText(""); 

      } 
    }); 

} 
} 

Answer 1

Sie brauchen nicht ScrollView.

Satz Eigenschaft wie in Ihrem Textview

android:maxLines = "add your integer value" 
android:scrollbars = "vertical" 

Bei dem Klicken

mButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      mTextView.setMovementMethod(new ScrollingMovementMethod()); 
      } 
    }); 

Answer 2

Ich glaube, ich das Update auf meinem eigenen gefunden. Ich habe eine benutzerdefinierte TextView-Klasse mit Scroller-Methode erstellt und mit XML-Code verknüpft. Werfen Sie einen Blick,

AutoScrollingText.java

public class AutoScrollingText extends TextView { 

    private static final float DEFAULT_SPEED = 9.0f; 

    public Scroller scroller; 
    public float speed = DEFAULT_SPEED; 
    public boolean continuousScrolling = true; 

    public AutoScrollingText(Context context) { 
     super(context); 
     scrollerInstance(context); 
    } 

    public AutoScrollingText(Context context, AttributeSet attributes) { 
     super(context, attributes); 
     scrollerInstance(context); 
    } 

    public void scrollerInstance(Context context) { 
     scroller = new Scroller(context, new LinearInterpolator()); 
     setScroller(scroller); 
    } 


    @Override 
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 
     super.onLayout(changed, left, top, right, bottom); 
     if (scroller.isFinished()) { 
      scroll(); 
     } 
    } 

    public void scroll() { 
     int viewHeight = getHeight(); 
     int visibleHeight = viewHeight - getPaddingBottom() - getPaddingTop(); 
     int lineHeight = getLineHeight(); 

     int offset = -1 * visibleHeight; 
     int distance = visibleHeight + getLineCount() * lineHeight; 
     int duration = (int) (distance * speed); 


     scroller.startScroll(0, offset, 0, distance, duration); 
    } 



    public void setSpeed(float speed) { 
     this.speed = speed; 
    } 

    public float getSpeed() { 
     return speed; 
    } 

    public void setContinuousScrolling(boolean continuousScrolling) { 
     this.continuousScrolling = continuousScrolling; 
    } 

    public boolean isContinuousScrolling() { 
     return continuousScrolling; 
    } 

} 

MainActivity.java

public class MainActivity extends AppCompatActivity{ 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 



    } 


} 

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:tools="http://schemas.android.com/tools" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:paddingBottom="@dimen/activity_vertical_margin" 
      android:paddingLeft="@dimen/activity_horizontal_margin" 
      android:paddingRight="@dimen/activity_horizontal_margin" 
      android:paddingTop="@dimen/activity_vertical_margin" 
      android:elevation="10dp" 
      tools:context=".MainActivity" > 


    <com.bhabani2077.scrolltext.AutoScrollingText 
     android:text="@string/random_text" 
     android:id="@+id/textview1" 
     android:focusable="true" 
     android:scrollHorizontally="false" 
     android:scrollbars="vertical" 
     android:ellipsize="marquee" 
     android:layout_width="match_parent" 
     android:marqueeRepeatLimit ="marquee_forever" 
     android:layout_height="200dp"/> 

</RelativeLayout>