Android中添加和识别手势操作

客官°小女子只卖身不卖艺 2022-08-22 00:19 233阅读 0赞

### 实现思路：将手势写入GestureLibrary中，对其他手势进行匹配对比，进行识别 ###

*  先在布局中加入GestureOverlayView组件

<android.gesture.GestureOverlayView
            android:id="@+id/add_gesture"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gestureStrokeType="multiple"
            />
    
        <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="#AFAFAF"
            />
    
        <android.gesture.GestureOverlayView
            android:id="@+id/recognize_gesture"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gestureStrokeType="multiple"
            />

android:gestureStrokeType="" 
        multiple：手势需要多笔完成
        single：手势一笔完成

*  代码：

package top.helloworlds.gesture;
    
    import android.content.DialogInterface;
    import android.gesture.Gesture;
    import android.gesture.GestureLibraries;
    import android.gesture.GestureLibrary;
    import android.gesture.GestureOverlayView;
    import android.gesture.Prediction;
    import android.graphics.Bitmap;
    import android.graphics.Color;
    import android.os.Bundle;
    import android.support.v7.app.AlertDialog;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.Toolbar;
    import android.view.View;
    import android.widget.ArrayAdapter;
    import android.widget.EditText;
    import android.widget.ImageView;
    import android.widget.Toast;
    
    import java.util.ArrayList;
    
    public class MainActivity extends AppCompatActivity {
    
        GestureOverlayView addGesture;
        GestureOverlayView recognizeGesture;
        GestureLibrary library;
    
        //设置手势库存储的路径
        final String LIBRARY_PATH = "/mnt/sdacrd/Gesture";
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);
    
            //添加手势
            addNewGesture();
            //识别手势
            recognizeTheGesture();
        }
    
        private void recognizeTheGesture() {
            //读取手势库
            library = GestureLibraries.fromFile(LIBRARY_PATH);
            if (library.load()) {
                Toast.makeText(MainActivity.this, "装载成功", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(MainActivity.this, "装载失败", Toast.LENGTH_SHORT).show();
            }
    
            //获取手势编辑组件
            recognizeGesture = (GestureOverlayView) findViewById(R.id.recognize_gesture);
            //为组件添加监听器
            recognizeGesture.addOnGesturePerformedListener(new GestureOverlayView.OnGesturePerformedListener() {
                @Override
                public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
                    //识别绘制的手势库
                    ArrayList<Prediction> predictions = library.recognize(gesture);
                    ArrayList<String> result = new ArrayList<String>();
                    //遍历所有找到的Prediction对象
                    for (Prediction pred : predictions) {
                        //当相识度大于2.0时输出
                        if (pred.score > 2.0) {
                            result.add("与"+pred.name+"相似的为"+pred.score);
                        }
                    }
    
                    if (result.size() > 0) {
                        //使用一个带List的对话框来显示所有匹配的手势
                        ArrayAdapter<Object> adapter = new ArrayAdapter<Object>(MainActivity.this,
                                android.R.layout.simple_dropdown_item_1line,
                                result.toArray());
                        //显示在对话框内
                        new AlertDialog.Builder(MainActivity.this)
                                .setAdapter(adapter, null)
                                .setPositiveButton("确定", null).show();
                    } else {
                        Toast.makeText(MainActivity.this, "未找到匹配的手势", Toast.LENGTH_SHORT).show();
                    }
                }
            });
    
        }
    
        private void addNewGesture() {
    
            //获取手势编辑视图
            addGesture = (GestureOverlayView) findViewById(R.id.add_gesture);
            //设置手势绘制的颜色
            addGesture.setGestureColor(Color.RED);
            //设置手势的绘制宽度
            addGesture.setGestureStrokeWidth(4);
            //添加监听事件
            addGesture.addOnGesturePerformedListener(new GestureOverlayView.OnGesturePerformedListener() {
                @Override
                public void onGesturePerformed(GestureOverlayView overlay, final Gesture gesture) {
                    //加载布局文件所代表的视图
                    View saveDialog = getLayoutInflater().inflate(R.layout.dialog, null);
                    ImageView imageView = (ImageView) saveDialog.findViewById(R.id.imageView);
                    final EditText editText = (EditText) saveDialog.findViewById(R.id.editText);
    
                    //根据Gesture包含的手势创建位图
                    Bitmap bitmap = gesture.toBitmap(128, 128, 10, Color.RED);
                    imageView.setImageBitmap(bitmap);
    
                    //使用对话框显示布局文件
                    new AlertDialog.Builder(MainActivity.this)
                            .setView(saveDialog)
                            .setPositiveButton("保存", new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    //获取指定文件对应的手势库
                                    GestureLibrary gestureLibrary = GestureLibraries.fromFile(LIBRARY_PATH);
                                    //添加手势
                                    gestureLibrary.addGesture(editText.getText().toString(), gesture);
                                    //保存手势库
                                    gestureLibrary.save();
                                }
                            })
                            .setNegativeButton("取消", null)
                            .show();
                }
            });
    
        }
    
    
    }