Android手势创建与保存

安卓手势创建与保存代码:

MainActivity

package com.example.gesture;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Set;
import android.Manifest;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.GestureOverlayView.OnGesturePerformedListener;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MenuItem.OnMenuItemClickListener;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.core.app.ActivityCompat;

public class MainActivity extends Activity implements OnGesturePerformedListener
{

    private GestureOverlayView mDrawGestureView;
    private static GestureLibrary sStore;

    // 权限申请
    private static final int REQUEST_EXTERNAL_STORAGE = 1;
    private static String[] PERMISSIONS_STORAGE = {
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE
    };
    public void myPermission() {
        int permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (permission != PackageManager.PERMISSION_GRANTED) {
            // We don't have permission so prompt the user
            ActivityCompat.requestPermissions(
                    this,
                    PERMISSIONS_STORAGE,
                    REQUEST_EXTERNAL_STORAGE
            );
        }
    }


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mDrawGestureView = (GestureOverlayView)findViewById(R.id.gesture);

        //设置手势可多笔画绘制，默认情况为单笔画绘制
        mDrawGestureView.setGestureStrokeType(GestureOverlayView.GESTURE_STROKE_TYPE_MULTIPLE);
        //设置手势的颜色(蓝色)
        mDrawGestureView.setGestureColor(gestureColor(R.color.gestureColor));
        //设置还没未能形成手势绘制是的颜色(红色)
        mDrawGestureView.setUncertainGestureColor(gestureColor(R.color.ungestureColor));
        //设置手势的粗细
        mDrawGestureView.setGestureStrokeWidth(4);
        /*手势绘制完成后淡出屏幕的时间间隔，即绘制完手指离开屏幕后相隔多长时间手势从屏幕上消失；
         * 可以理解为手势绘制完成手指离开屏幕后到调用onGesturePerformed的时间间隔
         * 默认值为420毫秒，这里设置为0.5秒
         */
        mDrawGestureView.setFadeOffset(500);

        //绑定监听器
        mDrawGestureView.addOnGesturePerformedListener(this);
        //创建保存手势的手势库
        createStore();
    }

    private void createStore()
    {
        File mStoreFile = null;
        /*判断mStoreFile是为空。
         * 判断手机是否插入SD卡，并且应用程序是否具有访问SD卡的权限
         */
        if (mStoreFile == null && Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
        {
            mStoreFile = new File(Environment.getExternalStorageDirectory(), "mygesture");
            Log.d("gesture",Environment.getExternalStorageDirectory().getAbsolutePath());
            Log.d("gesture","mStore"+mStoreFile.getAbsolutePath());
        }



        if (sStore == null)
        {
    		/* 另外三种创建保存手势文件的方式如下：
    		//保存手势的文件在手机SD卡中
    		sStore = GestureLibraries.fromFile(Environment.getExternalStorageDirectory().getAbsolutePath() + "mygesture");
    		sStore = GestureLibraries.fromPrivateFile(this, Environment.getExternalStorageDirectory().getAbsolutePath + "mygesture");


    		*/
            //保存手势的文件在应用程序的res/raw文件下
            //sStore = GestureLibraries.fromRawResource(this, R.raw.gestures);
            sStore = GestureLibraries.fromFile(mStoreFile);

        }
        testLoad();
    }

    //测试保存手势的文件是否创建成功
    private void testLoad()
    {
        if (sStore.load())
        {
            showMessage("手势文件装载成功");
            Log.d("gesture","手势文件转载成功");
            // 显示所有手势名称
            Iterator<String> value;
            Log.d("gesture","加载成功");
            final Set<String> entries=sStore.getGestureEntries();// 获取所有保存的手势名称
            value=entries.iterator();
            int i=0;
            while (value.hasNext()){
                i=i+1;
                Log.d("gesture","手势名称:"+value.next()+i);
            }


        }
        else
        {
            Log.d("gesture","手势文件转载失败");
            showMessage("手势文件装载失败");
        }
    }

    public static GestureLibrary getStore()
    {
        return sStore;
    }

    //手势绘制完成时调用
    @Override
    public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture)
    {
        // TODO Auto-generated method stub
        creatDialog(gesture);
    }

    private void creatDialog(final Gesture gesture)
    {

        final View dialogView = getLayoutInflater().inflate(R.layout.show_gesture, null);
        //imageView用于显示绘制的手势
        ImageView imageView = (ImageView) dialogView.findViewById(R.id.show);

        // 调用Gesture的toBitmap方法形成对应手势的位图
        final Bitmap bitmap = gesture.toBitmap(128, 128, 10, gestureColor(R.color.showColor));
        imageView.setImageBitmap(bitmap);

        Builder dialogBuider = new AlertDialog.Builder(MainActivity.this);

        dialogBuider.setView(dialogView);
        //绑定对话框的确认按钮监听事件
        dialogBuider.setPositiveButton(
                "保存", new OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog, int which)
                    {

                        // 获取权限
                        myPermission();
                        //获取用户保存手势的名字
                        //final String name = "Star";
                        EditText editText = (EditText)dialogView.findViewById(R.id.name);
                        final String name = editText.getText().toString(); //移到确认按钮监听事件里面，不然总是会获得空内容

                        // 添加手势
                        sStore.addGesture(name, gesture);
                        // 保存添加的手势
                        sStore.save();
                        Log.v("gesture","save");
                    }
                });
        //绑定对话框的取消按钮监听事件
        dialogBuider.setNegativeButton("取消", new OnClickListener()
        {

            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                // TODO Auto-generated method stub

            }
        });
        //显示对话框
        dialogBuider.show();
    }

    private int gestureColor(int resId)
    {
        return getResources().getColor(resId);
    }

    private void showMessage(String s)
    {
        Toast.makeText(this, s, Toast.LENGTH_SHORT).show();
    }

    @Override
    protected void onDestroy()
    {
        // TODO Auto-generated method stub
        super.onDestroy();
        //移除绑定的监听器
        mDrawGestureView.removeOnGesturePerformedListener(this);
    }

}

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">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


    <android.gesture.GestureOverlayView
    android:id="@+id/gesture"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" >
</android.gesture.GestureOverlayView>

</androidx.constraintlayout.widget.ConstraintLayout>

show_gesture.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="8dip"
            android:text="@string/set_gesture_name"/>

        <EditText
            android:id="@+id/name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

    </LinearLayout>

    <ImageView
        android:id="@+id/show"
        android:layout_gravity="center"
        android:layout_width="128dp"
        android:layout_height="128dp"
        android:layout_marginTop="10dp"/>
</LinearLayout>

生成之后目录在: /storage/emulated/0/mygusture

如果保存之后在这里看不到文件就打开cmd,

输入adb root

然后再来看就出现了