1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height 6     tools:context=".MainActivity"
 7     android:orientation="vertical">
 8 
 9     TextView
10         android:text="请输入argb值："
11         android:textSize="20sp"
12         android:textColor="#000"
13         android:layout_width14         android:layout_height="wrap_content"
15         android:layout_margin="10dp"/>
16 
17     LinearLayout
18         android:layout_width19 ="50dp"
20         android:orientation="horizontal"21         EditText
22             android:id="@+id/etA"
23             android:layout_width="0dp"
24             android:layout_weight="1"
25             android:layout_height26             android:layout_margin="1dp"
27             android:hint="透明度(0-255)"
28             android:inputType="number"29 
30         31             ="@+id/etR"
32 ="红(0-255)"
33 34 35 36             android:background="#f00"
37 38             android:gravity="center"
39 ="number"40     </LinearLayout41     42         43 44 45         46             ="@+id/etG"
47 ="绿(0-255)"
48 49 50 51 ="#0f0"
52 53 54 55 
56         57             ="@+id/etB"
58 ="蓝(0-255)"
59 60 61 62 ="#00f"
63 64 65 66     67 
68     69         ="@+id/tv_show"
70         android:text="TextView"
71 ="200dp"
72 73         android:background74         android:layout_gravity75         android:layout_marginTop="20dp"
76         77 
78     Button
79         ="@+id/btn"
80 ="确定配置"
81 82 83 ="wrap_content" 84 >

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 2 
 3     private EditText etA;
 4      EditText etR;
 5      EditText etG;
 6      EditText etB;
 7      TextView tvShow;
 8      Button btn;
 9 
10     @Override
11     protected void onCreate(Bundle savedInstanceState) {
12         super.onCreate(savedInstanceState);
13         setContentView(R.layout.activity_main);
14 
15         initView();
16     }
17 
18     private  initView() {
19         etA = (EditText) findViewById(R.id.etA);
20         etR = (EditText) findViewById(R.id.etR);
21         etG = (EditText) findViewById(R.id.etG);
22         etB = (EditText) findViewById(R.id.etB);
23         tvShow = (TextView) findViewById(R.id.tv_show);
24         btn = (Button) findViewById(R.id.btn);
25 
26         btn.setOnClickListener(this);
27 28 
29 30      onClick(View v) {
31         switch (v.getId()) {
32             case R.id.btn:
33                 submit();
34                 break;
35         }
36 37 
38      submit() {
39         // validate
40         if (!etA.getText().equals("")&&!etB.getText().equals("")
41                 &&!etR.getText().equals("")&&!etG.getText().equals("")) {
42             对用户输入的数值进行判断是否为空。避免空字符无法转换为int异常
43             int et_a = Integer.parseInt(etA.getText().toString());
44             int et_r = Integer.parseInt(etR.getText().toString());
45             int et_g = Integer.parseInt(etG.getText().toString());
46             int et_b = Integer.parseInt(etB.getText().toString());
47             tvShow.setBackgroundColor(Color.argb(et_a,et_r,et_g,et_b));
48         }else {
49             Toast.makeText(this,"输入的值不能为空",Toast.LENGTH_SHORT).show();
50 51 52 }