安卓自定义TextView实现自动滚动
Posted 别人眼中的过客
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了安卓自定义TextView实现自动滚动相关的知识,希望对你有一定的参考价值。
xml文件代码
<com.mobile.APITest.ScrollEditText android:id="@+id/statusEditText" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginLeft="5dip" android:layout_marginRight="5dip" android:layout_weight="1" android:gravity="top" android:scrollbarFadeDuration="1000" android:scrollbarStyle="insideOverlay" android:scrollbars="vertical" android:singleLine="false" android:textColor="@color/black" />
自定义TextView
package com.mobile.APITest; import android.annotation.SuppressLint; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.text.method.ScrollingMovementMethod; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.widget.EditText; import android.widget.TextView; import com.mobile.pos.lib.Global.POSCharUtils; /** * Created by Administrator on 2016/11/23. */ @SuppressLint("AppCompatCustomView") public class ScrollEditText extends TextView { private static final String TAG = "ScrollEditText"; private boolean pressFlag = false;//判断手指是否按着屏幕,如果是就不需要滚动了。 public ScrollEditText(Context context) { super(context); } public ScrollEditText(Context context, AttributeSet attrs) { super(context, attrs); } public ScrollEditText(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override public boolean dispatchTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_UP) { postDelayed(runnable, 2000); } if (event.getAction() == MotionEvent.ACTION_MOVE) { pressFlag = true; } if (event.getAction() == MotionEvent.ACTION_DOWN) { pressFlag = true; removeCallbacks(runnable); } POSCharUtils.showLogD(TAG, event.getAction() + ""); return super.dispatchTouchEvent(event); } private Runnable runnable = new Runnable() { @Override public void run() { pressFlag = false; } }; @Override protected void onFinishInflate() { super.onFinishInflate(); setOnLongClickListener(new OnLongClickListener() { @Override public boolean onLongClick(View v) { showDialog(); return false; } }); setMovementMethod(ScrollingMovementMethod.getInstance()); } public void appendStr(final CharSequence text) { post(new Runnable() { @Override public void run() { ScrollEditText.super.append(text); POSCharUtils.showLogD(TAG, text.toString()); if (pressFlag) return; int scrollAmount = getLayout().getLineTop(getLineCount()) - getHeight(); if (scrollAmount > 0) scrollTo(0, scrollAmount); else scrollTo(0, 0); } }); } public void setTextStr(final CharSequence text) { post(new Runnable() { @Override public void run() { ScrollEditText.super.setText(text); if (pressFlag) return; int scrollAmount = getLayout().getLineTop(getLineCount()) - getHeight(); if (scrollAmount > 0) scrollTo(0, scrollAmount); else scrollTo(0, 0); } }); } private void scrollTop() { scrollTo(0, 0); } private void scrollBottom() { int scrollAmount = getLayout().getLineTop(getLineCount()) - getHeight(); if (scrollAmount > 0) scrollTo(0, scrollAmount); else scrollTo(0, 0); } //信息内容是简单地列表项 public void showDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(this.getContext()); //定义复选框 builder.setItems(new String[]{"顶部", "底部"}, listener); builder.create().show(); } private DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { switch (which) { case 0: scrollTop(); break; case 1: scrollBottom(); break; } } }; }
长按ScrollEditText 可以跳转至view的底部或者顶部
以上是关于安卓自定义TextView实现自动滚动的主要内容,如果未能解决你的问题,请参考以下文章
Android 文字自动滚动(跑马灯)效果的两种实现方法[特别好使]