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This article mainly introduces the Android how to achieve the radio button related knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe that after reading this Android how to achieve the radio button article will have a harvest, let's take a look at it.

Radio button

By default, the radio button is displayed as a circular icon, and you can place some description text next to it. Typically, the RadioButton component needs to be used with the RadioGroup component to form a radio button group. A RadioGroup is a container that can hold multiple RadioButton.

The layout effect shows:

The android:checked property of the RadioButton component is used to specify the selected state. When android:checked= "true", it is selected; when android:checked= "false", it is unchecked.

There are three ways to get the selected value:

The first is to set up an event listener setOnCheckChangeListener for RadioButton.

Public class MainActivity extends AppCompatActivity {RadioGroup radioGroup; @ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.activity_main); / / initialize control initView (); / / Click event clickEvent ();} private void initView () {radioGroup = findViewById (R.id.radioGroup) } private void clickEvent () {/ / bind monitor radioGroup.setOnCheckedChangeListener (new MyRadioButtonListener ()) to RadioGroup;} / / radio button listens to private class MyRadioButtonListener implements RadioGroup.OnCheckedChangeListener {@ Override public void onCheckedChanged (RadioGroup group, int checkedId) {RadioButton r = (RadioButton) findViewById (checkedId) / / get the selected Id Log.i ("Radio Button listening", "Select gender:" + r.getText () .toString ());}

Radio button listens to the log effect:

The second gets the value of the selected radio button by clicking another button.

Public class MainActivity extends AppCompatActivity implements View.OnClickListener {RadioGroup radioGroup; / / submit Button bt_submit; @ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.activity_main); / / initialize control initView (); / / Click event clickEvent ();} private void initView () {radioGroup = findViewById (R.id.radioGroup) Bt_submit = findViewById (R.id.bt_submit);} private void clickEvent () {/ / submit bt_submit.setOnClickListener (this);} @ Override public void onClick (View v) {switch (v.getId ()) {case R.id.bt_submit: for (int I = 0; I < radioGroup.getChildCount () RadioButton +) {RadioButton r = (RadioButton) radioGroup.getChildAt (I); if (r.isChecked ()) {Log.i ("get when clicking other buttons", "Select gender:" + r.getText ());}} break;}}

Determine the log effect display of clicking another button to get the value of the selected radio button:

The third method determines which radio button's id is the id being clicked, and gets the value through id.

Public class MainActivity extends AppCompatActivity {RadioGroup radioGroup; / / male RadioButton radio_man; / / female RadioButton radio_female; @ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.activity_main); / / initialize control initView (); / / Click event clickEvent () } private void initView () {radioGroup = findViewById (R.id.radioGroup); radio_man = findViewById (R.id.radio_man); radio_female = findViewById (R.id.radio_female);} private void clickEvent () {/ / bind monitor radioGroup.setOnCheckedChangeListener (new MyRadioButtonListener () to RadioGroup) } / / Radio button listens to private class MyRadioButtonListener implements RadioGroup.OnCheckedChangeListener {@ Override public void onCheckedChanged (RadioGroup group) Int checkedId) {/ / switch (checkedId) {case R.id.radio_female: / / Log.i when the user selects a woman ("judging to click on the radio button of Id", "select gender:" + radio_female.getText (). ToString ()) Break; case R.id.radio_man: / / when the user selects a male, Log.i ("judge to click the radio button of Id", "select gender:" + radio_man.getText (). ToString ()); break;}

Determine the log effect display of the radio button clicked:

This is the end of the article on "how to implement radio buttons in Android". Thank you for reading! I believe you all have a certain understanding of the knowledge of "how to achieve radio buttons in Android". If you want to learn more, you are welcome to follow the industry information channel.

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