Zi 字媒體
2017-07-25T20:27:27+00:00
Button button;
b1=(Button)findViewById(R.id.b1);
b1.setOnClickListener(new Button.OnClickListener(){
@Override public void onClick(View v) {
//這邊寫function
}
});
也可以先到XML檔案裏面設定Button的ID屬性和Click再到JAVA檔案裏面引用Button id
public void add(View v){
.........................
}
範例
XML
xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/b1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
android.support.constraint.ConstraintLayout>
JAVA
public class MainActivity extends AppCompatActivity {
TextView text;
Button b1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (TextView)findViewById(R.id.text);
b1=(Button)findViewById(R.id.b1);
b1.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
text.setText("123456789");
}
});
}
}
展示圖
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