Android学习之通过SeekBar调节布局背景颜色（RGB）

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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

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