初识SeekBar

SeekBar拖动条，是Progress的间接子类

<SeekBar
            android:id="@+id/seekBar1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:progress="30"
            //Draws the thumb on a seekbar. 
            android:thumb="@drawable/peasy" />

SeekBar事件，被拉动时，onProgressChanged会一直被触发

public void showSeekBar() {
        seekBar = (SeekBar) findViewById(R.id.seekBar1);
        seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
                Log.i(TAG, "onStopTrackingTouch");
                Toast.makeText(FormActivity.this,
                        "current level is " + seekBar.getProgress(), 3000)
                        .show();
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
                Log.i(TAG, "onStartTrackingTouch");

            }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {
                // TODO Auto-generated method stub
                Log.i(TAG, "onProgressChanged");

            }
        });
    }