Android -- TextView(二)追加文字,并自动滚动(触底时)

Android – TextView(二)追加文字,并自动滚动(触底时)

**实现要求:**在固定高度的TextView内追加显示内容,当内容高度超出TextView高度时,内容自动向上滚动(能显示最下方内容)。

布局:


<TextView
    android:id="@+id/tvLog"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:enabled="false"
    android:focusable="false"
    android:gravity="center_vertical|top"
    android:inputType="textMultiLine"
    android:scrollbars="vertical"
    android:scrollbarStyle="insideOverlay"
    android:fadeScrollbars="false"
    android:scrollbarFadeDuration="2000">
TextView>

自定义方法:

private TextView tvLog;

tvLog = findViewById(R.id.tvLog);
tvLog.setMovementMethod(ScrollingMovementMethod.getInstance());

//当需追加新内容时,直接调用此方法即可;
public void addLog(final String strLog) {
        final String strText = strLog;
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                //附加与log前的时间标签(可注释)
                SimpleDateFormat formatter = new SimpleDateFormat("hh:mm:ss");
                Date curDate = new Date(System.currentTimeMillis());// 获取当前时间
                String strDate = formatter.format(curDate);

                //已有的log
                String strLogs = tvLog.getText().toString().trim();
                if (strLogs.equals("")) {
                    strLogs = strDate + ": " + strText;
                } else {
                    strLogs += "\r\n" + strDate + ": " + strText;
                }
                //刷新添加新的log
                tvLog.setText(strLogs);
                //==================add auto scroll========================
                //log View自动滚动
                tvLog.post(new Runnable() {
                    @Override
                    public void run() {
                        int scrollAmount = tvLog.getLayout().getLineTop(tvLog.getLineCount()) - tvLog.getHeight();
                        if (scrollAmount > 0)
                            tvLog.scrollTo(0, scrollAmount);
                        else
                            tvLog.scrollTo(0, 0);
                    }
                });
            }
        });
    }

参考:https://blog.csdn.net/u014341735/article/details/78425437

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