mainActivity如下:
package cn.c;
import java.io.File;
import java.util.ArrayList;
import java.util.Set;
import android.app.Activity;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.GestureOverlayView.OnGestureListener;
import android.gesture.GestureOverlayView.OnGesturePerformedListener;
import android.gesture.Prediction;
import android.os.Bundle;
import android.os.Environment;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.widget.Button;
import android.widget.EditText;
/**
* 需求描述:
* 向手势库中保存一个手势
* 错误总结:
* 错误1:
* 描述:在GestureOverlayView画一个手势后,该手势会
* 里面消失,不会停留显示在GestureOverlayView控件上
* 原因:
* 没有在布局文件中为GestureOverlayView设置以下属性
* android:gestureStrokeType="multiple"
* 错误2:对于手势库文件gestureLibraryFile和手势库mGestureLibrary
* 的理解有些偏差了.片面的理解为:这是两个独立的东西或者说
* gestureLibraryFile中存放了一个mGestureLibrary
* 应该这里理解:
* mGestureLibrary就是一个文件!
* 只是以前没有遇到这种文件,一时半会没有反应过来
*/
public class MainActivity extends Activity {
private EditText mEditText;
private GestureOverlayView mGestureOverlayView;
private GestureLibrary mGestureLibrary;
private Gesture mGesture;
private Button mSaveButton;
private Button mResetButton;
private String mGestureLibraryPath;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private void init() {
mEditText = (EditText) findViewById(R.id.editText);
mEditText.setOnKeyListener(new OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (mGesture!=null&&mEditText.getText().toString().length()>0) {
mSaveButton.setEnabled(true);
} else {
mSaveButton.setEnabled(false);
}
return false;
}
});
mGestureOverlayView =
(GestureOverlayView) findViewById(R.id.gestureOverlayView);
mSaveButton = (Button) findViewById(R.id.saveButton);
mSaveButton.setOnClickListener(new ButtonOnClickListenerImpl());
mSaveButton.setEnabled(false);
mResetButton = (Button) findViewById(R.id.resetButton);
mResetButton.setOnClickListener(new ButtonOnClickListenerImpl());
//GestureLibrary文件的路径
mGestureLibraryPath =
Environment.getExternalStorageDirectory()+File.separator+"testgestures";
//为GestureOverlayView添加监听事件
mGestureOverlayView.addOnGestureListener(new GestureListenerImpl());
}
private class GestureListenerImpl implements OnGestureListener{
//开始绘制手势
public void onGestureStarted(GestureOverlayView overlay,MotionEvent event) {
mSaveButton.setEnabled(false);
mGesture=null;
}
public void onGesture(GestureOverlayView overlay, MotionEvent event) {
}
//手势绘制结束
public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) {
mGesture=mGestureOverlayView.getGesture();
if (mGesture!=null&&mEditText.getText().toString().length()>0) {
mSaveButton.setEnabled(true);
}
}
public void onGestureCancelled(GestureOverlayView overlay,MotionEvent event) {
}
}
private class ButtonOnClickListenerImpl implements OnClickListener {
public void onClick(View v) {
switch (v.getId()) {
case R.id.resetButton:
mGestureOverlayView.clear(true);
mSaveButton.setEnabled(false);
mEditText.setText("");
break;
case R.id.saveButton:
String gestureName = mEditText.getText().toString();
try {
File gestureLibraryFile = new File(mGestureLibraryPath);
// 加载该路径下的手势库.
// 若不存在,则会在路径下创建一个手势库
mGestureLibrary = GestureLibraries.fromFile(mGestureLibraryPath);
if (!gestureLibraryFile.exists()) {
mGestureLibrary.addGesture(gestureName, mGesture);
if (mGestureLibrary.save()) {
//只有执行完mGestureLibrary.save()的时候
//gestureLibraryFile文件才不为空
//所以if只会执行一次,往后都执行else
mSaveButton.setEnabled(false);
mEditText.setText("");
mGestureOverlayView.clear(true);
System.out.println("xxxx0000 成功");
} else {
System.out.println("xxxx0000 失败");
}
} else {
if (!mGestureLibrary.load()) {
System.out.println("xxxx1111 加载手势库失败");
} else {
Set<String> gesturyies = mGestureLibrary.getGestureEntries();
// 删除已经存在的同名的手势
if (gesturyies.contains(gestureName)) {
ArrayList<Gesture> list = mGestureLibrary.getGestures(gestureName);
for (int i = 0; i < list.size(); i++) {
mGestureLibrary.removeGesture(gestureName,list.get(i));
}
}
// 添加手势
mGestureLibrary.addGesture(gestureName, mGesture);
// 判断手势是否保存成功
if (mGestureLibrary.save()) {
mGestureOverlayView.clear(true);
mSaveButton.setEnabled(true);
mEditText.setText("");
System.out.println("xxxx1111 手势保存成功");
} else {
System.out.println("xxxx1111 手势保存失败");
}
}
}
} catch (Exception e) {
}
break;
default:
break;
}
}
}
}
main.xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="@+id/linearLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:orientation="horizontal" >
<TextView
android:id="@+id/textView"
android:layout_width="100dip"
android:layout_height="wrap_content"
android:text="手势的名称:" />
<EditText
android:id="@+id/editText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="在此输入" />
</LinearLayout>
<android.gesture.GestureOverlayView
android:id="@+id/gestureOverlayView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@id/linearLayout"
android:layout_marginBottom="50dip"
android:gestureStrokeType="multiple"
/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="50dip"
android:layout_alignParentBottom="true"
android:orientation="horizontal" >
<Button
android:id="@+id/saveButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="保存"
/>
<Button
android:id="@+id/resetButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="重置"
/>
</LinearLayout>
</RelativeLayout>