垂直自动滚动文本

Question

如何以垂直方式自动滚动至文本结尾？此代码在一段时间后停止并且未达到结束。而且我想在点击按钮后开始滚动直到结束。一些帮助就足够了。

activity_main.xml中

<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

你不需要ScrollView。就像在你的TextView

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

一套物业在点击

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

Answer 2

我想我找到我自己的修复。我使用Scroller方法创建了一个自定义TextView类，并将其链接到XML代码。看看，

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中

<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>