Android 的 Button 按钮实现的两种方式
第一组方式:
res/laoyout/activity_main.xml 代码:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView1" android:layout_marginTop="51dp" android:layout_toRightOf="@+id/textView1" android:text="按钮" /> </RelativeLayout>
MainActivity.java 代码:
package com.example.testbutton; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final Button bt = (Button) findViewById (R.id.button); bt.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { // TODO Auto-generated method stub Toast.makeText(MainActivity.this,"亲,你点击按钮了 ",1000).show(); } }) ; } }
第二组方式:
我们可以在布局文件中的Button属性中设置 onClick事件,
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView1" android:layout_marginTop="51dp" android:layout_toRightOf="@+id/textView1" android:onClick="clickMyself" android:text="按钮" /> </RelativeLayout>
MainActivity.java 代码:
package com.example.testbutton; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final Button bt = (Button) findViewById (R.id.button); } public void clickMyself(View view){ Toast.makeText(MainActivity.this, "按钮被点击了", 2000).show(); } }