Android 手势

作者: 赵者也 | 来源:发表于2017-04-23 16:28 被阅读46次

Android Tip : Android GestureDet
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Android手势事件检测GestureDetector
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Android 手势
DrawerLayout 侧边栏禁止手指滑动弹出
Android自定义支持滑动监听View
Android GestureDetector：那些你一定要学会
Android API 30 工作间

使用 Android 手势监测需要两个步骤：

实现 GestureDetector.OnGestureListener 监听器实例以创建 GestureDetector 对象；
为组件的 TouchEvent 事件绑定监听器，在事件处理中把组件上的 TouchEvent 事件交给 GestureDetector 处理，而 GestureDetector 就会检测是否触发了特定的手势动作。

下面是测试不同动作触发哪种手势的实例：

package com.toby.personal.testlistview;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements GestureDetector.OnGestureListener {

    final private static String TAG = "Toby_Test";

    private GestureDetector detector;

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

        // 必须创建手势检测器
        detector = new GestureDetector(this, this);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // 注意此处的处理
        return detector.onTouchEvent(event);
    }

    @Override
    public boolean onDown(MotionEvent e) {
        Toast.makeText(this, "onDown", Toast.LENGTH_SHORT).show();
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {
        Toast.makeText(this, "onShowPress", Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        Toast.makeText(this, "onSingleTapUp", Toast.LENGTH_SHORT).show();
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        Toast.makeText(this, "onScroll", Toast.LENGTH_SHORT).show();
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {
        Toast.makeText(this, "onLongPress", Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        Toast.makeText(this, "onFling", Toast.LENGTH_SHORT).show();
        return false;
    }
}

通过 Fling 手势缩放图片

主布局文件的内容：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/container"
    android:background="@color/colorGray"
    android:orientation="vertical"
    >

    <ImageView
        android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

主程序的内容如下：

package com.toby.personal.testlistview;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements GestureDetector.OnGestureListener {

    final private static String TAG = "Toby_Test";

    private GestureDetector detector;
    private ImageView imageView;
    private Bitmap bitmap;
    private int width;
    private int height;
    private float currentScale = 1;
    private Matrix matrix;

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

        // 必须创建手势检测器
        detector = new GestureDetector(this, this);

        imageView = (ImageView) findViewById(R.id.image);
        matrix = new Matrix();
        bitmap = BitmapFactory.decodeResource(this.getResources(), R.drawable.girl04);
        width = bitmap.getWidth();
        height = bitmap.getHeight();
        imageView.setImageBitmap(
                BitmapFactory.decodeResource(this.getResources(), R.drawable.girl04));
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // 注意此处的处理
        return detector.onTouchEvent(event);
    }

    @Override
    public boolean onDown(MotionEvent e) {
//        Toast.makeText(this, "onDown", Toast.LENGTH_SHORT).show();
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {
//        Toast.makeText(this, "onShowPress", Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
//        Toast.makeText(this, "onSingleTapUp", Toast.LENGTH_SHORT).show();
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
//        Toast.makeText(this, "onScroll", Toast.LENGTH_SHORT).show();
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {
//        Toast.makeText(this, "onLongPress", Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        Toast.makeText(this, "onFling", Toast.LENGTH_SHORT).show();

        velocityX = Math.max(Math.min(velocityX, 4000), -4000);

        currentScale += currentScale * velocityX / 4000.0f;
        currentScale = Math.max(currentScale, 0.01f);

        matrix.reset();
        matrix.setScale(currentScale, currentScale, 160, 200);

        BitmapDrawable tmp = (BitmapDrawable) imageView.getDrawable();
        if (!tmp.getBitmap().isRecycled()) { // 如果图片还未回收，先强制回收该图片
            tmp.getBitmap().recycle();
        }

        Bitmap bitmap2 = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);

        imageView.setImageBitmap(bitmap2);

        return true;
    }
}

通过手势实现翻页效果

主布局文件的代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/container"
    android:background="@color/colorGray"
    android:orientation="vertical"
    >

    <ViewFlipper
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/flipper"
        />

</LinearLayout>

主程序文件的内容如下：

package com.toby.personal.testlistview;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.ViewFlipper;

public class MainActivity extends AppCompatActivity implements GestureDetector.OnGestureListener {

    final private static String TAG = "Toby_Test";

    private ViewFlipper flipper;
    private GestureDetector detector;
    Animation[] animations = new Animation[4];
    final int FLIP_DISTANCE = 50;

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

        // 必须创建手势检测器
        detector = new GestureDetector(this, this);

        flipper = (ViewFlipper) findViewById(R.id.flipper);
        flipper.addView(addImageView(R.drawable.girl01));
        flipper.addView(addImageView(R.drawable.girl02));
        flipper.addView(addImageView(R.drawable.girl03));
        flipper.addView(addImageView(R.drawable.girl04));
        flipper.addView(addImageView(R.drawable.girl05));

        animations[0] = AnimationUtils.loadAnimation(this, R.anim.slide_in_right);
        animations[1] = AnimationUtils.loadAnimation(this, R.anim.slide_out_left);
    }

    private View addImageView(int resId) {
        ImageView imageView = new ImageView(this);
        imageView.setImageResource(resId);
        imageView.setScaleType(ImageView.ScaleType.CENTER);
        return imageView;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // 注意此处的处理
        return detector.onTouchEvent(event);
    }

    @Override
    public boolean onDown(MotionEvent e) {
//        Toast.makeText(this, "onDown", Toast.LENGTH_SHORT).show();
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {
//        Toast.makeText(this, "onShowPress", Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
//        Toast.makeText(this, "onSingleTapUp", Toast.LENGTH_SHORT).show();
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
//        Toast.makeText(this, "onScroll", Toast.LENGTH_SHORT).show();
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {
//        Toast.makeText(this, "onLongPress", Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        Toast.makeText(this, "onFling", Toast.LENGTH_SHORT).show();

        if (e1.getX() - e2.getX() > FLIP_DISTANCE) {
            flipper.setInAnimation(animations[0]);
            flipper.setOutAnimation(animations[1]);
            flipper.showPrevious();
            return true;
        }

        if (e2.getX() - e1.getX() > FLIP_DISTANCE){
            flipper.setInAnimation(this, android.R.anim.slide_in_left);
            flipper.setOutAnimation(this, android.R.anim.slide_out_right);
            flipper.showNext();
            return true;
        }

        return false;
    }
}

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