Android 监听EditText 使Button是否能可用工具类

来源：互联网发布：百度云域名查询编辑：程序博客网时间：2024/04/30 15:46

如图最近接手一个项目很多这种未输入按钮不可用的界面，所以把这种功能封装了一下

这里写图片描述

使用：

@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)public class MainActivity extends AppCompatActivity {    private EditText editPhone,editPwd,editVerify;    private Button btnRegister;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        init();    }    private void init(){        editPhone = (EditText) findViewById(R.id.edit_phone);        editPwd = (EditText) findViewById(R.id.edit_pwd);        editVerify = (EditText) findViewById(R.id.edit_verification);        btnRegister = (Button) findViewById(R.id.btn_register);        //setBtn对应的是按钮 addEditView可多个        BtnToEditListenerUtils.getInstance()                .setBtn(btnRegister)                .addEditView(editPhone)                .addEditView(editPwd)                .addEditView(editVerify)                .build();        btnRegister.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Toast.makeText(getApplicationContext(),"Register",Toast.LENGTH_SHORT).show();            }        });    }}

BtnToEditListenerUtils

@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)public class BtnToEditListenerUtils {    private List<EditText> editTextList = new ArrayList<>();    private Button btn;    public static BtnToEditListenerUtils getInstance(){        return new BtnToEditListenerUtils();    }    public BtnToEditListenerUtils setBtn(Button btn){        this.btn = btn;        btn.setEnabled(false);        return this;    }    public BtnToEditListenerUtils addEditView(EditText editText){        editTextList.add(editText);        return this;    }    public void build(){            setWatcher();    }    /**     * 给每一个EditText设置Watcher监听，当前的EditText文本不为空时遍历每一个EditText，     * 只有都不为空时 tag为true     */    private void setWatcher(){        for (int i = 0; i < editTextList.size(); i++) {            editTextList.get(i).addTextChangedListener(new TextWatcher() {                @Override                public void beforeTextChanged(CharSequence s, int start, int count, int after) {                }                @Override                public void onTextChanged(CharSequence s, int start, int before, int count) {                }                @Override                public void afterTextChanged(Editable s) {                    if (s.length() == 0) {                        setBtnUnavailable();                        return;                    }                    boolean tag = false;                    for (int i = 0; i < editTextList.size(); i++) {                        if (editTextList.get(i).getText().length() != 0) {                            tag = true;                        }else{                            tag = false;                            break;                        }                    }                    if (tag) {                        setBtnAvailable();                    }else{                        setBtnUnavailable();                    }                }            });        }    }    private void setBtnAvailable(){        btn.setBackground(ContextCompat.getDrawable(App.getAppContext(), R.drawable.main_color_btn_round_bg));        btn.setEnabled(true);    }    private void setBtnUnavailable(){        btn.setBackground(ContextCompat.getDrawable(App.getAppContext(), R.drawable.gray_btn_round_bg));        btn.setEnabled(true);    }

源码
代码逻辑不难，都有注释。
end！

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