android - 更改填充所有编辑文本字段的按钮颜色？

Question

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" />

如何将此背景更改为 @drawable/button_success 如果所有编辑文本字段都填充了我的 Activity 类，如下所示

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_signup);
        btn_app_signup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

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

                registerAccount(name, email, password);
            }
        });
    }

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

        if(TextUtils.isEmpty(name) || TextUtils.isEmpty(email) || TextUtils.isEmpty(password)) {
            Toast.makeText(SignupActivity.this, "All fields required", Toast.LENGTH_LONG).show();
        }
        else {

            //save data in datbase
        }
    }

如果我填写所有编辑文本字段填充更改按钮按钮背景，我该怎么做

Answer 1

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);
            }
        }
    });