在项目的build.gradle中添加一行代码
dependencies {
classpath 'com.android.tools.build:gradle:3.2.0'
//Butterknife
classpath 'com.jakewharton:butterknife-gradle-plugin:8.8.1'
}
在你的app里导入依赖
//ButterKnife
implementation 'com.jakewharton:butterknife:8.8.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
布局文件
<?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">
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="点击"
/>
<TextView
android:id="@+id/tv"
app:layout_constraintTop_toBottomOf="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</android.support.constraint.ConstraintLayout>
Main中的代码
public class MainActivity extends AppCompatActivity {
//绑定控件
@BindView(R.id.btn)
Button button;
@BindView(R.id.tv)
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//一定记住在 onCreate() 中调用 ButterKnife.bind(this);, 否则不起作用
ButterKnife.bind(this);
}
//绑定事件
@OnClick(R.id.tv)
void tvOnClick(View view){
String s = ((TextView) view).getText().toString();
Toast.makeText(this, s, Toast.LENGTH_SHORT).show();
}
@OnClick(R.id.btn)
void btnOnClick(){
Toast.makeText(this, "123456", Toast.LENGTH_SHORT).show();
textView.setText("123456");
}
}