使用SeekBar办Android调色板

1、接口布局xml代码：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="当前值是：#000000" />

        <TextView
            android:id="@+id/textView5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="20px"
            android:width="100px"
            android:text="test" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="红：" />

        <SeekBar
            android:id="@+id/seekBar1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:max="255"
            android:padding="10px"
            android:progress="00" />

        <EditText
            android:id="@+id/editText1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="0"
            android:ems="10" >

            <requestFocus />
        </EditText>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="绿" />

        <SeekBar
            android:id="@+id/seekBar2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:max="255"
            android:progress="0"
            android:layout_weight="1" />

        <EditText
            android:id="@+id/editText2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="00"
            android:ems="10" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="蓝" />

        <SeekBar
            android:id="@+id/seekBar3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:max="255"
            android:progress="0"
            android:layout_weight="1" />

        <EditText
            android:id="@+id/editText3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="00"
            android:ems="10" />

    </LinearLayout>

</LinearLayout>

2、java代码：

package com.jwy;

import android.os.Bundle;
import android.R.integer;
import android.R.string;
import android.app.Activity;
import android.graphics.Color;
import android.view.Menu;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.Toast;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

public class MainActivity extends Activity {

    private TextView textView;
    private SeekBar seekBar1;
    private SeekBar seekBar2;
    private SeekBar seekBar3;

    private EditText editText1;
    private EditText editText2;
    private EditText editText3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView)findViewById(R.id.textView1);
        seekBar1 =(SeekBar)findViewById(R.id.seekBar1);
        seekBar2 =(SeekBar)findViewById(R.id.seekBar2);
        seekBar3 =(SeekBar)findViewById(R.id.seekBar3);

        editText1=(EditText)findViewById(R.id.editText1);
        editText2=(EditText)findViewById(R.id.editText2);
        editText3=(EditText)findViewById(R.id.editText3);

        seekBar1.setOnSeekBarChangeListener(new OnSeekBarChangeListener()
        {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar)
            {
                // TODO Auto-generated method stub
                //Toast.makeText(MainActivity.this, "结束华滑动", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar)
            {
                // TODO Auto-generated method stub
                //Toast.makeText(MainActivity.this, "開始滑动", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser)
            {
                // TODO Auto-generated method stub
                //Toast.makeText(MainActivity.this, "当前值是："+progress, Toast.LENGTH_SHORT).show();
                String str = String.format("%1$02x", progress);
                editText1.setText(str); 
                doWork();
            }
        });

        seekBar2.setOnSeekBarChangeListener(new OnSeekBarChangeListener()
        {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar)
            {
                // TODO Auto-generated method stub

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar)
            {
                // TODO Auto-generated method stub

            }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser)
            {
                // TODO Auto-generated method stub
                //editText2.setText(Integer.toHexString(progress));

                editText2.setText(String.format("%1$02x", progress));
                doWork();
            }
        });

        seekBar3.setOnSeekBarChangeListener(new OnSeekBarChangeListener()
        {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar)
            {
                // TODO Auto-generated method stub

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar)
            {
                // TODO Auto-generated method stub

            }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser)
            {
                // TODO Auto-generated method stub
                //editText3.setText(Integer.toHexString(progress));
                editText3.setText(String.format("%1$02x", progress));

                doWork();
            }
        });
    }

    private void doWork()
    {
        String sTmp = editText1.getText().toString()+ editText2.getText().toString() + editText3.getText().toString();
        textView.setText("当前值是：#" + sTmp);
        TextView tView = (TextView)findViewById(R.id.textView5);
        tView.setBackgroundColor(Color.parseColor("#"+sTmp));

        //tView.setBackgroundColor(Color.parseColor("#ff00"));
    }

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

}