android中手勢識別的實現

第一步：建立手勢庫

使用SDK自帶例子GestureBuilder建立手勢庫（位置：android-sdk-windows\samples\android-8\GestureBuilder）。使用GestureBuilder之前，你需要恢復其到開發環境，然後進行編繹並部署到手機上。此時，就可以使用GestureBuilder建立手勢庫，生成的手勢庫文件在SCDard上，默認文件名稱爲：gestures

第二步：在應用中加載手勢庫文件，然後開發手勢識別代碼。

把手勢庫文件gestures文件拷貝到項目的res/raw目錄下。然後在佈局文件中添加用於手勢繪製的View：

<android.gesture.GestureOverlayView

    android:id="@+id/gestures"

    android:layout_width="fill_parent“ android:layout_height="0dip"

    android:layout_weight="1.0" />

爲View添加手勢監聽事件：gestureOverlayView.addOnGesturePerformedListener();

得到手勢庫：mLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);

加載手勢庫：mLibrary.load();

List<Prediction> predictions = mLibrary.recognize(gesture);//從手勢庫中查詢匹配的內容，匹配的結果可能包括多個相似的內容，匹配度高的結果放在最前面

大多數情況下，手勢都是通過一筆完成。然而有一些特別的需求就需要通過多個筆畫來實現，這時可以使用gestureStrokeType屬性進行設置：android:gestureStrokeType="multiple"

String文件：

<?xml
version="1.0"
encoding="utf-8"?>
<resources>

    <string
name="app_name">GestureTest</string>
    <string
name="notrecognize">不能識別該手勢</string>
    <string
name="noprediction">手勢識別率太低，請重新輸入</string>

</resources>

<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">GestureTest</string> <string name="notrecognize">不能識別該手勢</string> <string name="noprediction">手勢識別率太低，請重新輸入</string> </resources>

佈局文件：

<?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"
>

    <android.gesture.GestureOverlayView
        android:id="@+id/myGestureView"
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="1.0"
        />

</LinearLayout>

<?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" > <android.gesture.GestureOverlayView android:id="@+id/myGestureView" android:layout_width="fill_parent" android:layout_height="0dip" android:layout_weight="1.0" /> </LinearLayout>

Java文件：

package cn.class3g.gesture;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Intent;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.GestureOverlayView.OnGesturePerformedListener;
import android.gesture.Prediction;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

public class GestureTestActivity
extends Activity {

    GestureOverlayView getstureView;
    GestureLibrary gLibrary;
    boolean loadState = true;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        init();

    }

    private void init() {
        getstureView = (GestureOverlayView) 
this
                .findViewById(R.id.myGestureView);
        getstureView
                .addOnGesturePerformedListener(new MyOnGesturePerformedListener());

        // 創建手勢庫對象GestureLibrary
        gLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);
        // 加載手勢庫資源
        loadState = gLibrary.load();

    }

    private final
class MyOnGesturePerformedListener 
implements
            OnGesturePerformedListener {

        public void onGesturePerformed(GestureOverlayView overlay,
                Gesture gesture) {
            if (loadState) {
                ArrayList<Prediction> predictions = gLibrary.recognize(gesture);

                if (!predictions.isEmpty()) {
                    Prediction prediction = predictions.get(0);

                    Log.i("TAG", String.valueOf(prediction.score));

                if (prediction.score >
5) {//如果是1的話太容易失敗，本人測試5比較合適
                        if ("close".equals(prediction.name)) {
                            finish();//實現關閉功能，用的是activity自帶的
                        } else
if ("dialto".equals(prediction.name)) {
                            //實現播出固定電話的功能，記得添加權限
                            Intent intent = 
new Intent(Intent.ACTION_CALL,
                                    Uri.parse("tel:[phone]"));
                            startActivity(intent);
                        }
                    }

                } else {
                    showToast(R.string.notrecognize);
                }

            } else {
                showToast(R.string.noprediction);
            }

        }

    }

    private void showToast(int resId) {
        Toast.makeText(this, resId, Toast.LENGTH_LONG).show();
    }
}

package cn.class3g.gesture; import java.util.ArrayList; import android.app.Activity; import android.content.Intent; import android.gesture.Gesture; import android.gesture.GestureLibraries; import android.gesture.GestureLibrary; import android.gesture.GestureOverlayView; import android.gesture.GestureOverlayView.OnGesturePerformedListener; import android.gesture.Prediction; import android.net.Uri; import android.os.Bundle; import android.util.Log; import android.widget.Toast; public class GestureTestActivity extends Activity { GestureOverlayView getstureView; GestureLibrary gLibrary; boolean loadState = true; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); } private void init() { getstureView = (GestureOverlayView) this .findViewById(R.id.myGestureView); getstureView .addOnGesturePerformedListener(new MyOnGesturePerformedListener()); // 創建手勢庫對象GestureLibrary gLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures); // 加載手勢庫資源 loadState = gLibrary.load(); } private final class MyOnGesturePerformedListener implements OnGesturePerformedListener { public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) { if (loadState) { ArrayList<Prediction> predictions = gLibrary.recognize(gesture); if (!predictions.isEmpty()) { Prediction prediction = predictions.get(0); Log.i("TAG", String.valueOf(prediction.score)); if (prediction.score > 5) {//如果是1的話太容易失敗，本人測試5比較合適 if ("close".equals(prediction.name)) { finish();//實現關閉功能，用的是activity自帶的 } else if ("dialto".equals(prediction.name)) { //實現播出固定電話的功能，記得添加權限 Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:[phone]")); startActivity(intent); } } } else { showToast(R.string.notrecognize); } } else { showToast(R.string.noprediction); } } } private void showToast(int resId) { Toast.makeText(this, resId, Toast.LENGTH_LONG).show(); } }