Android 更改按钮颜色所有编辑文本字段是否已填充？

我的布局文件中有如下按钮和文本字段

<EditText
        android:id="@+id/et_password"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView4"
        android:layout_centerHorizontal="true"
        android:ems="10"
        android:inputType="textPassword" />

    <Button
        android:id="@+id/btn_app_signup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/et_password"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="63dp"
        android:background="@drawable/button"
        android:text="SIGN UP"
        android:textColor="@color/white" />

---

如果我填充所有编辑文本字段填充更改按钮背景，我该怎么做？您只需使用

drawable

更改背景，如下所示：

btn_app_signup.setBackground(getResources().getDrawable(R.dr‌​awable.button_succes‌​s));

检查文本时：

if(et_name.getText().toString().equals("") || et_email.getText().toString().equals("") || et_password.getText().toString().equals("")) {
    Toast.makeText(SignupActivity.this, "All fields required", Toast.LENGTH_LONG).show();
}

希望有帮助。

试试这个

private void registerAccount(String name, String email, String password) {    

        if(!TextUtils.isEmpty(name)&& !TextUtils.isEmpty(email) && !TextUtils.isEmpty(password)){

           btn_app_signup.setBackground(ContextCompat.getDrawable(this,R.drawable.ic_android_black_24dp));// set here your backgournd to button
          // save data in database

        }else {
            Toast.makeText(this, "All fields required", Toast.LENGTH_LONG).show();
        }


    }

编辑

 et_password.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void afterTextChanged(Editable editable) {
            if (!TextUtils.isEmpty(et_name.getText().toString()) && !TextUtils.isEmpty(et_email.getText().toString()) && !TextUtils.isEmpty(et_password.getText().toString())) {
                btn_app_signup.setBackground(ContextCompat.getDrawable(MainActivity.this, R.drawable.ic_android_black_24dp));// set here your backgournd to button
            }else {
                btn_app_signup.setBackgroundResource(android.R.drawable.btn_default);
            }
        }
    });
    et_email.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void afterTextChanged(Editable editable) {
            if (!TextUtils.isEmpty(et_name.getText().toString()) && !TextUtils.isEmpty(et_email.getText().toString()) && !TextUtils.isEmpty(et_password.getText().toString())) {
                btn_app_signup.setBackground(ContextCompat.getDrawable(MainActivity.this, R.drawable.ic_android_black_24dp));// set here your backgournd to button
            }else {
                btn_app_signup.setBackgroundResource(android.R.drawable.btn_default);
            }
        }
    });
    et_name.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void afterTextChanged(Editable editable) {
            if (!TextUtils.isEmpty(et_name.getText().toString()) && !TextUtils.isEmpty(et_email.getText().toString()) && !TextUtils.isEmpty(et_password.getText().toString())) {
                btn_app_signup.setBackground(ContextCompat.getDrawable(MainActivity.this, R.drawable.ic_android_black_24dp));// set here your backgournd to button
            }else {
                btn_app_signup.setBackgroundResource(android.R.drawable.btn_default);
            }
        }
    });

并使函数无效

 private void valiadte(String name,String email,String password){ 
              if(!TextUtils.isEmpty(name)&&!TextUtils.isEmpty(email)&&!TextUtils.isEmpty(password){
               btn_app_signup.setBackground(ContextCompat.getDrawable(this,R.drawable.ic_android_black_24dp));
               // set here your backgournd to button     
  } 

 }

---

我如何检查所有字段是否已填充如果我使用此方法，它将只使用我按下按钮您可以解释更多当您想要更改按钮背景@HemalHerathall编辑文本字段填充，我想改变背景是的，在html中是这样的，就像onchange方法，怎么能一次检查所有字段

et_name.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){
    String name=et_name.getText().toString();
    String email=et_email.getText().toString();
    String password=et_password.getText().toString();

    valiadte(name,email,password);
    }

    @Override
    public void afterTextChanged(Editable s){

    }
    });

    et_email.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){
    String name=et_name.getText().toString();
    String email=et_email.getText().toString();
    String password=et_password.getText().toString();

    valiadte(name,email,password);
    }

    @Override
    public void afterTextChanged(Editable s){

    }
    });
    et_password.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){
    String name=et_name.getText().toString();
    String email=et_email.getText().toString();
    String password=et_password.getText().toString();

    valiadte(name,email,password);
    }

    @Override
    public void afterTextChanged(Editable s){

    }
    });

 private void valiadte(String name,String email,String password){ 
              if(!TextUtils.isEmpty(name)&&!TextUtils.isEmpty(email)&&!TextUtils.isEmpty(password){
               btn_app_signup.setBackground(ContextCompat.getDrawable(this,R.drawable.ic_android_black_24dp));
               // set here your backgournd to button     
  } 

 }