Android学习之通过SeekBar调节布局背景颜色（RGB）

用RGB设置布局背景颜色的方法

relativeLayout.setBackgroundColor(Color.rgb(r,g,b));

布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/RelativeLayout"
    tools:context="com.example.konghao.adjustcolor.MainActivity">


    <LinearLayout
        android:layout_marginLeft="30dp"
        android:layout_marginRight="30dp"
        android:layout_marginTop="50dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/int_R"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <SeekBar
            android:id="@+id/R"
            android:layout_marginTop="10dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <TextView
            android:id="@+id/int_G"
            android:layout_marginTop="30dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <SeekBar
            android:id="@+id/G"
            android:layout_marginTop="10dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <TextView
            android:id="@+id/int_B"
            android:layout_marginTop="30dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <SeekBar
            android:id="@+id/B"
            android:layout_marginTop="10dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

    </LinearLayout>

</RelativeLayout>

Main活动

public class MainActivity extends Activity {

    private RelativeLayout relativeLayout;
    private SeekBar color_R,color_G,color_B;
    private static int r = 0,g = 0,b = 0;
    private TextView int_r,int_g,int_b;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        relativeLayout = (RelativeLayout) findViewById(R.id.RelativeLayout);

        color_R = (SeekBar) findViewById(R.id.R);
        color_G = (SeekBar) findViewById(R.id.G);
        color_B = (SeekBar) findViewById(R.id.B);
        int_r = (TextView) findViewById(R.id.int_R);
        int_g = (TextView) findViewById(R.id.int_G);
        int_b = (TextView) findViewById(R.id.int_B);

        color_R.setMax(255);
        color_G.setMax(255);
        color_B.setMax(255);

        color_B.setProgress(0);
        color_G.setProgress(0);
        color_B.setProgress(0);

        color_R.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar,int progress, boolean fromUser) {
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                r = seekBar.getProgress();
                String int_color_r = "R:" + String.valueOf(r);
                int_r.setText(int_color_r);
                relativeLayout.setBackgroundColor(Color.rgb(r,g,b));
            }
        });

        color_G.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean fromUser) {
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                g = seekBar.getProgress();
                String int_color_g = "G:" + String.valueOf(g);
                int_g.setText(int_color_g);
                relativeLayout.setBackgroundColor(Color.rgb(r,g,b));
            }
        });

        color_B.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean fromUser) {
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                b = seekBar.getProgress();
                String int_color_b = "B:" + String.valueOf(b);
                int_b.setText(int_color_b);
                relativeLayout.setBackgroundColor(Color.rgb(r,g,b));
            }
        });
    }
}

效果