单击按钮时旋转图像而不是单击按钮时停止图像

Question

我试图在单击按钮时旋转图像，然后在单击另一个按钮时停止旋转图像。我有两个问题，1.）当您第二次单击按钮时，我不确定如何停止动画，以及 2.）我的图像旋转真的很慢，而且根本没有持续旋转。我试图让它不断地在同一个位置旋转。

这是我的 java 代码...

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {
    private static ImageView imgView;
    private static Button button;
    private int current_image_index;
    private static Button creditsButton;
    int[] images = {R.mipmap.imageid, R.mipmap.imageid};

    ImageView blade;

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

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

            }
        });
    }




    public void buttonClick() {
        imgView = (ImageView) findViewById(R.id.imageView);
        button = (Button) findViewById(R.id.button);
        blade = (ImageView)findViewById(R.id.imageView4);
        final Animation animRotate = AnimationUtils.loadAnimation(this, R.anim.rotate);


        button.setOnClickListener(
                new View.OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        blade.startAnimation(animRotate);
                        current_image_index++;
                        current_image_index = current_image_index % images.length;
                        imgView.setImageResource(images[current_image_index]);
                    }


                }
        );
    }






    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

这是我的旋转 xml 代码...

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <rotate xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="1000"
        android:fromDegrees="0"
        android:pivotX="50%"
        android:pivotY="48%"
        android:toDegrees="1080"
        android:repeatCount="infinite"
        />
</set>

Answer 1

1、使用clearAnimation()停止动画，把下面的代码放到你的onClickListener：

if (blade.getAnimation() == null) {
    // no animation, start it
    blade.startAnimation(animRotate);
} else {
    //animation is showing, stop it
    blade.clearAnimation();
}

2，在imgView.setImageResource(images[current_image_index]);之后使用imgView.invalidate()来解决“滞后问题”。