[安卓] 5、SeekBar拖动条

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越来越发现这些控件用法大同小异了，这里注意几个函数：seekBar.setSecondaryProgress(0);设置初始进度为0，总共为0~99，对其监听用setOnSeekBarChangeListener。

public class MainActivity extends Activity {
    private SeekBar seekBar;
    private TextView tv;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        seekBar = (SeekBar) findViewById(R.id.seekbar);
        tv = (TextView) findViewById(R.id.tv);
        seekBar.setSecondaryProgress(0);
        seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
            //当用户对拖动条的拖动的动作完成时触发
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                tv.setText("<拖动条>完成拖动"); 
            }
            //当用户对拖动条进行拖动时触发
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                tv.setText("<拖动条>拖动中...");  
            }
            //当拖动条的值发生改变的时触发
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                tv.setText("当前<拖动条>的值为："+progress);
            }
        });
    }
}

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