Button控件

Button控件布局文件 main.xmlButton android:idid/button_login android:layout_width100dp android:layout_heightwrap_content android:text登录 /方法一主要文件 xxxxx.javapublic class LoginActivity extends Activity { /** Called when the activity is first created. */ private Button btn1null; Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btn1(Button)findViewById(R.id.button_login); btn1.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Toast.makeText(LoginActivity.this, 你点击了按钮, Toast.LENGTH_LONG).show(); } }); } }方法二主要文件 xxxxx.java// 170320 sta //注意 这里要追加 implements View.OnClickListener !!! public class LoginActivity extends AppCompatActivity implements View.OnClickListener { // 170320 end /** Called when the activity is first created. */ private Button btn1null; Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 170320 sta btn1(Button)findViewById(R.id.button_login); btn1.setOnClickListener(this); // 170320 end } // 170320 sta Override public void onClick(View v) { switch (v.getId()) { //跳转到 登录 页面 case R.id.button_debug_login: Intent intent_new new Intent(LoginActivity.this,NewActivity.class); startActivity(intent_new); break; default: break; } } // 170320 end }