SeekBar拖动条

一时失言乱红尘 2023-10-10 05:22 5阅读 0赞

seekbar拖动条,通过滑块的位置值的改变,来对某些数据进行调节,比如音量调节; 改变滑块的外观可以通过android:thumb属性完成

实例:拖动滑块改变图片透明度

public class MainActivity extends Activity {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.seek);
            
            SeekBar sb = (SeekBar) findViewById(R.id.sb);
            final ImageView iv = (ImageView) findViewById(R.id.iv);
            sb.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
                
                @Override
                public void onStopTrackingTouch(SeekBar seekBar) {
                }
                
                @Override
                public void onStartTrackingTouch(SeekBar seekBar) {
                }
                
                @Override
                public void onProgressChanged(SeekBar seekBar, int progress,
                        boolean fromUser) {
                    iv.setAlpha(progress);
                }
            });
        }
    
    }

转载于:https://www.cnblogs.com/android-zcq/p/3139788.html