Question

public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        Toast.makeText(this, String.valueOf(progress), Toast.LENGTH_SHORT).show();
        changeColor(viewOne, progress);
        changeColor(viewTwo, progress);
        changeColor(viewThree, progress);
        changeColor(viewFour, progress);
        changeColor(viewFive, progress);
    }

@Override
public void onStopTrackingTouch(SeekBar seekBar) {

}

@Override
public void onStartTrackingTouch(SeekBar seekBar) {

}

I am trying to update the value of the seekbar and display it in a toast. however, the toast updates the value extremely slowly. I would not like to use a textbox. Is there a way to accomplish this?

Answer 1

Using popup window.You can customize the view of popup window, like a textview to show the progress. In method onStartTrackingTouch, show the popup window. In method onStopTrackingTouch, dismiss the popup window. In method onProgressChanged, change the progress. Sample code:

package com.example.test;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.ViewGroup.LayoutParams;
import android.widget.PopupWindow;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class MainActivity extends Activity implements OnSeekBarChangeListener {

    private SeekBar seek;
    private PopupWindow window;
    private TextView textview;

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

        seek = (SeekBar) findViewById(R.id.seek);
        seek.setOnSeekBarChangeListener(this);
        window = new PopupWindow(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        textview = new TextView(this);
        textview.setTextSize(16);
        textview.setBackgroundColor(Color.BLACK);
        textview.setTextColor(Color.WHITE);
        window.setContentView(textview);
    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        // TODO Auto-generated method stub
        textview.setText("progress : " + progress);
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub
        window.showAsDropDown(seek);
    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub
        window.dismiss();
    }
}

Hope it helps.

Answer 2

在班级宣布祝酒词

Toast mToast;

在constructor或onCreate

中初始化祝酒词

protected void onCreate(Bundle savedInstanceState) {
    ...
    mToast = Toast.makeText(context, "", Toast.LENGTH_SHORT);
}

然后当你需要展示吐司时

@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
    mToast.setText("progress : " + progress);
    mToast.show();
}

现在你的吐司更新将是即时的。

Answer 3

根据上面的第二个答案，在班级宣布敬酒。我删除了.scss已更改为context

MainActivity.this

seekbar onProgressChange value updates extremely slow in toast

3 个答案: