[移动开发]逐帧动画的使用

1.在drawable中创建一个loading.xml

<?xml version="1.0" encoding="utf-8"?>
<animation-list  android:oneshot="true" xmlns:android="http://schemas.android.com/apk/res/android">
<item
    android:drawable="@drawable/one"
    android:duration="100"/>
    <item
        android:drawable="@drawable/two"
        android:duration="100"/>
    <item
        android:drawable="@drawable/three"
        android:duration="100"/>
</animation-list>

其中

 android:oneshot="true"指让动画演示一遍停止

2.页面的布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <View
        android:id="@+id/view"
        android:layout_width="300dp"
        android:layout_height="300dp"
        android:background="@drawable/loading"
        android:layout_centerInParent="true"
        />
    <LinearLayout
        android:layout_alignParentBottom="true"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:id="@+id/btnStart"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Start"
            android:layout_weight="1"
            />
        <Button
            android:id="@+id/btnStop"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Stop"
            android:layout_weight="1"
            />




    </LinearLayout>




</RelativeLayout>

3.主代码的编写

package com.example.readbokk;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
private AnimationDrawable animationDrawable;
private View view;
private Button btnstart;
private Button btnstop;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();
        initEven();

    }

    private void initEven() {
    btnstart.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            animationDrawable.start();
        }
    });
        btnstop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                animationDrawable.stop();
            }
        });
    }

    private void initView() {
        view = findViewById(R.id.view);
        btnstart = findViewById(R.id.btnStart);
        btnstop = findViewById(R.id.btnStop);
        animationDrawable = (AnimationDrawable) view.getBackground();//强转
        animationDrawable.setOneShot(true);//调用该方法演示一遍则停止
    }


}

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