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Android滚动条
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17. ScrollView(滚动条)
activity_main.xml
:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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">
<!--
ScrollView:滚动条
-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/btn_up"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="滚到顶部" />
<Button
android:id="@+id/btn_down"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="滚到底部" />
<ScrollView
android:id="@+id/scrollView"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/txt_show"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</LinearLayout>
</ScrollView>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
:
package com.lzhpo.scrollview;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ScrollView;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button btn_down;
private Button btn_up;
private ScrollView scrollView;
private TextView txt_show;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bindViews();
}
private void bindViews() {
btn_down = (Button) findViewById(R.id.btn_down);
btn_up = (Button) findViewById(R.id.btn_up);
scrollView = (ScrollView) findViewById(R.id.scrollView);
txt_show = (TextView) findViewById(R.id.txt_show);
btn_down.setOnClickListener(this);
btn_up.setOnClickListener(this);
StringBuilder sb = new StringBuilder();
for (int i = 1; i <= 100; i++) {
sb.append("呵呵 * " + i + "\n");
}
txt_show.setText(sb.toString());
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_down:
scrollView.fullScroll(ScrollView.FOCUS_DOWN);
break;
case R.id.btn_up:
scrollView.fullScroll(ScrollView.FOCUS_UP);
break;
}
}
}
- 本文标签: Android Java
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