安卓自定义TextView实现自动滚动

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

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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