Question

我正在进行一些测试，只需根据三个滑块更改文本颜色作为主要活动中的RGB值。问题在于无法在我的滑块上设置自定义侦听器。这是我的代码。此外，所有需要的东西都是导入的，只是没有包含它们，因为这里的代码插入事物并不喜欢它;

public class MainActivity extends AppCompatActivity {
int[] currentCol = {0, 0, 0};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


}
SeekBar Red = (SeekBar) findViewById(R.id.R);
SeekBar Blue = (SeekBar) findViewById(R.id.B);
SeekBar Green = (SeekBar) findViewById(R.id.G);

TextView textBox = (TextView) findViewById(R.id.colorText);


OnSeekBarChangeListener customListener = new OnSeekBarChangeListener() {

    @Override
    public void onProgressChanged(SeekBar name, int progress, boolean fromUser) {
        if (name == Red) {
            currentCol[0] = progress;
        } else if (name == Blue) {
            currentCol[1] = progress;
        } else if (name == Green) {
            currentCol[2] = progress;
        }
        textBox.setTextColor(Color.rgb(currentCol[0], currentCol[1], currentCol[2]));
    }


    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }

};

public void setCustomListener(OnSeekBarChangeListener customListener) {
    this.customListener = customListener;
}

public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}


}

Answer 1

首先添加implements OnSeekBarChangeListener{

公共类MainActivity扩展了AppCompatActivity实现 OnSeekBarChangeListener {

在 oncreate（）功能

中调用此方法

SeekBar Red = (SeekBar) findViewById(R.id.R);
SeekBar Blue = (SeekBar) findViewById(R.id.B);
SeekBar Green = (SeekBar) findViewById(R.id.G);

Red.setOnSeekBarChangeListener(this); // set seekbar listener.

练习演示

Android SeekBar Example

无法解析setOnSeekBarChangeListener（）

1 个答案: