Android button click event four common writing methods, android four
The xml layout is as follows:
<Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button1" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button2" />
First: anonymous internal class
Applicable scenarios: ---------------------------------------------------------- test or single button
public class TestButtonActivity extends Activity { Button btn1, btn2; Toast tst; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_test_button); btn1 = (Button) findViewById(R.id.button1); btn2 = (Button) findViewById(R.id.button2); btn1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Toast tst = Toast.makeText(TestButtonActivity.this, "111111111", Toast.LENGTH_SHORT); tst.show(); } }); btn2.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Toast tst = Toast.makeText(TestButtonActivity.this, "222222222", Toast.LENGTH_SHORT); tst.show(); } }); }}
The second type of custom click event listening class:
Rarely used!
public class TestButtonActivity extends Activity { Button btn1, btn2; Toast tst; class MyClickListener implements OnClickListener { @Override public void onClick(View v) { // TODO Auto-generated method stub switch (v.getId()) { case R.id.button1: tst = Toast.makeText(TestButtonActivity.this, "111111111", Toast.LENGTH_SHORT); tst.show(); break; case R.id.button2: tst = Toast.makeText(TestButtonActivity.this, "222222222", Toast.LENGTH_SHORT); tst.show(); break; default: break; } } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_test_button); btn1 = (Button) findViewById(R.id.button1); btn2 = (Button) findViewById(R.id.button2); btn1.setOnClickListener(new MyClickListener()); btn2.setOnClickListener(new MyClickListener()); }}
The third type of Activity inherits View. OnClickListener, and The OnClick (View view) method is implemented by the Activity. In The OnClick (View view) method, switch-case is used to process the buttons represented by different IDs.
~~~~~~~~~~~~~~~ · It is often used. It is generally used when there are many buttons ~~~~~~~~~~ ·····
public class TestButtonActivity extends Activity implements OnClickListener { Button btn1, btn2; Toast tst; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_test_button); btn1 = (Button) findViewById(R.id.button1); btn2 = (Button) findViewById(R.id.button2); btn1.setOnClickListener(this); btn2.setOnClickListener(this); } @Override public void onClick(View v) { // TODO Auto-generated method stub switch (v.getId()) { case R.id.button1: tst = Toast.makeText(this, "111111111", Toast.LENGTH_SHORT); tst.show(); break; case R.id.button2: tst = Toast.makeText(this, "222222222", Toast.LENGTH_SHORT); tst.show(); break; default: break; } }}
Fourth, you do not need to set the Click Event in The Onclick Event code.
Public class TestButtonActivity extends Activity {Button btn1, btn2; Toast tst; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_test_button);} // note that there is no @ Override label public void onClick (View v) {// TODO Auto-generated method stub switch (v. getId () {case R. id. button1: tst = Toast. makeText (this, "111111111", Toast. LENGTH_SHORT); tst. show (); break; case R. id. button2: tst = Toast. makeText (this, "222222222", Toast. LENGTH_SHORT); tst. show (); break; default: break ;}}}