android自訂Seekbar你還將你的拖動數值顯示在旁邊固定的TextView上嗎？

標籤：android   seekbar   

轉載請註明出處：王亟亟的大牛之路

實現並不複雜，理解透徹.setLayoutParams()方法就能很簡單的實現了。

項目結構：

上方顯示的數值和位置會跟隨你的拖動變化而變化

MainActivity

public class MainActivity extends Activity {    private TextView num_tv;    private SeekBar seekBar;    private double width, fDensity;    private int numbers=0;    private DisplayMetrics displaysMetrics;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        initSeekBarProgress();    }    //擷取螢幕資訊，以及初始化操作    private void initView() {        displaysMetrics = getResources().getDisplayMetrics();        width = displaysMetrics.widthPixels;        fDensity = (width - dip2px(this, 51)) / 100;        seekBar = (SeekBar) findViewById(R.id.seekBar1);        num_tv = (TextView) findViewById(R.id.num_tv);    }    //TextView跟隨SeekBar移動    private void initSeekBarProgress() {        seekBar.setProgress(numbers);        seekBar.setOnSeekBarChangeListener(mSeekChange);        LinearLayout.LayoutParams paramsStrength = new LinearLayout.LayoutParams(                LinearLayout.LayoutParams.WRAP_CONTENT,                LinearLayout.LayoutParams.WRAP_CONTENT);        paramsStrength.leftMargin = (int) (numbers * fDensity);        num_tv.setLayoutParams(paramsStrength);        num_tv.setText(numbers+"");    }    private OnSeekBarChangeListener mSeekChange = new OnSeekBarChangeListener() {        @Override        public void onProgressChanged(SeekBar seekBar, int progress,                boolean fromUser) {            numbers = progress;            LinearLayout.LayoutParams paramsStrength = new LinearLayout.LayoutParams(                    LinearLayout.LayoutParams.WRAP_CONTENT,                    LinearLayout.LayoutParams.WRAP_CONTENT);            paramsStrength.leftMargin = (int) (progress * fDensity);            num_tv.setLayoutParams(paramsStrength);            num_tv.setText(numbers+"");        }        @Override        public void onStartTrackingTouch(SeekBar seekBar) {            // TODO Auto-generated method stub        }        @Override        public void onStopTrackingTouch(SeekBar seekBar) {            // TODO Auto-generated method stub        }    };    /**     * 根據手機解析度從 px(像素) 單位 轉成 dp     */    public static int px2dip(Context context, float pxValue) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (pxValue / scale + 0.5f);    }    /**     * 根據手機解析度從 dp 單位 轉成 px(像素)     */    public static int dip2px(Context context, float dpValue) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (dpValue * scale + 0.5f);    }}

布局檔案：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:background="#ffffff" >    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"        android:orientation="vertical" >        <TextView            android:id="@+id/num_tv"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@drawable/publish_seekbar_dialog"            android:gravity="center_horizontal"            android:paddingTop="1dp"            android:text="0"            android:textColor="#ffffff" />        <SeekBar            android:id="@+id/seekBar1"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:max="100"            android:progress="0"            android:progressDrawable="@drawable/seekbar_img"            android:thumb="@drawable/thumb" />    </LinearLayout></RelativeLayout>

實現就是這麼簡單，伸手黨可戳下面地址下載
源碼：http://yunpan.cn/cdDLTGbzVNJtk 訪問密碼 1b03

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android自訂Seekbar你還將你的拖動數值顯示在旁邊固定的TextView上嗎？