📜  Android图像切换器

📅  最后修改于: 2020-09-30 00:38:20             🧑  作者: Mango

Android图像切换器

Android图像切换器可在图像上提供动画,以从一个图像过渡到另一个图像。为了使用图像切换器,我们需要在.xml文件中实现ImageSwitcher组件。

ImageSwitcher的setFactory()方法提供ViewFactory接口的实现。 ViewFactory接口实现其未实现的方法并返回ImageView。

图像切换器示例

让我们实现一个图像切换器。

在布局文件夹中创建activity_main.xml和content_main.xml文件。

将一些图像放在可切换的文件夹中。

activity_main.xml

文件:activity_main.xml




    

        

    
    


content_main.xml

文件:content_main.xml




    

    

    

活动课

文件:MainActivity.java

package com.example.test.imageswitcher;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher;

import android.app.ActionBar;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;


public class MainActivity extends AppCompatActivity {
    ImageSwitcher imageSwitcher;
    Button nextButton;

    int imageSwitcherImages[] = 
      {R.drawable.cpp, R.drawable.c_sarp, R.drawable.jsp, R.drawable.mysql, R.drawable.hadoop};

    int switcherImageLength = imageSwitcherImages.length;
    int counter = -1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        imageSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher);
        nextButton = (Button) findViewById(R.id.button);

        imageSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
            @Override
            public View makeView() {
                ImageView switcherImageView = new ImageView(getApplicationContext());
                switcherImageView.setLayoutParams(new ImageSwitcher.LayoutParams(
                        ActionBar.LayoutParams.FILL_PARENT, ActionBar.LayoutParams.FILL_PARENT
                ));
                switcherImageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
                switcherImageView.setImageResource(R.drawable.hadoop);
                //switcherImageView.setMaxHeight(100);
                return switcherImageView;
            }
        });

        Animation aniOut = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right);
        Animation aniIn = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);

       imageSwitcher.setOutAnimation(aniOut);
       imageSwitcher.setInAnimation(aniIn);

        nextButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                counter++;
                if (counter == switcherImageLength){
                    counter = 0;
                    imageSwitcher.setImageResource(imageSwitcherImages[counter]);
                }
                else{
                    imageSwitcher.setImageResource(imageSwitcherImages[counter]);
                }
            }
        });
    }

}

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