java实现手写签名_手写签字，保存笔迹到图片

【实例简介】

【实例截图】

【核心代码】

package cn.handwriting;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import android.app.Activity;

import android.graphics.Bitmap;

import android.os.Bundle;

import android.os.Environment;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.ImageView;

import android.widget.TextView;

public class HandwritingActivity extends Activity {

/** Called when the activity is first created. */

private Bitmap mSignBitmap;

private String signPath;

private ImageView ivSign;

private TextView tvSign;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

setTitle("欢迎使用手写签名");

ivSign =(ImageView)findViewById(R.id.iv_sign);

tvSign = (TextView)findViewById(R.id.tv_sign);

ivSign.setOnClickListener(signListener);

tvSign.setOnClickListener(signListener);

}

private OnClickListener signListener = new View.OnClickListener() {

@Override

public void onClick(View v) {

WritePadDialog writeTabletDialog = new WritePadDialog(

HandwritingActivity.this, new DialogListener() {

@Override

public void refreshActivity(Object object) {

mSignBitmap = (Bitmap) object;

signPath = createFile();

/*BitmapFactory.Options options = new BitmapFactory.Options();

options.inSampleSize = 15;

options.inTempStorage = new byte[5 * 1024];

Bitmap zoombm = BitmapFactory.decodeFile(signPath, options);*/

ivSign.setImageBitmap(mSignBitmap);

tvSign.setVisibility(View.GONE);

}

});

writeTabletDialog.show();

}

};

/**

* 创建手写签名文件

*

* @return

*/

private String createFile() {

ByteArrayOutputStream baos = null;

String _path = null;

try {

String sign_dir = Environment.getExternalStorageDirectory() File.separator;

_path = sign_dir System.currentTimeMillis() ".jpg";

baos = new ByteArrayOutputStream();

mSignBitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);

byte[] photoBytes = baos.toByteArray();

if (photoBytes != null) {

new FileOutputStream(new File(_path)).write(photoBytes);

}

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if (baos != null)

baos.close();

} catch (IOException e) {

e.printStackTrace();

}

}

return _path;

}

}