Android实现屏幕手写签名

package com.fukaimei.touchevent;

import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.Toast;

import com.fukaimei.touchevent.filedialog.dialog.FileSaveFragment;
import com.fukaimei.touchevent.util.BitmapUtil;
import com.fukaimei.touchevent.widget.SignatureView;

public class SignatureActivity extends AppCompatActivity implements
 OnClickListener, FileSaveFragment.FileSaveCallbacks {
 private SignatureView view_signature;
 private ImageView iv_signature_new;
 private Bitmap mBitmap;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_signature);
 view_signature = (SignatureView) findViewById(R.id.view_signature);
 iv_signature_new = (ImageView) findViewById(R.id.iv_signature_new);
 findViewById(R.id.btn_add_signature).setOnClickListener(this);
 findViewById(R.id.btn_end_signature).setOnClickListener(this);
 findViewById(R.id.btn_reset_signature).setOnClickListener(this);
 findViewById(R.id.btn_revoke_signature).setOnClickListener(this);
 findViewById(R.id.btn_save_signature).setOnClickListener(this);
 }

 @Override
 public void onClick(View v) {
 if (v.getId() == R.id.btn_save_signature) {
 if (mBitmap == null) {
 Toast.makeText(this, "请先开始然后结束签名", Toast.LENGTH_LONG).show();
 return;
 }
 FileSaveFragment.show(this, "jpg");
 } else if (v.getId() == R.id.btn_add_signature) {
 view_signature.setDrawingCacheEnabled(true);
 } else if (v.getId() == R.id.btn_reset_signature) {
 view_signature.clear();
 } else if (v.getId() == R.id.btn_revoke_signature) {
 view_signature.revoke();
 } else if (v.getId() == R.id.btn_end_signature) {
 if (view_signature.isDrawingCacheEnabled() != true) {
 Toast.makeText(this, "请先开始签名", Toast.LENGTH_LONG).show();
 } else {
 mBitmap = view_signature.getDrawingCache();
 iv_signature_new.setImageBitmap(mBitmap);
 mHandler.postDelayed(mResetCache, 100);
 }
 }
 }

 private Handler mHandler = new Handler();
 private Runnable mResetCache = new Runnable() {
 @Override
 public void run() {
 view_signature.setDrawingCacheEnabled(false);
 view_signature.setDrawingCacheEnabled(true);
 }
 };

 @Override
 public boolean onCanSave(String absolutePath, String fileName) {
 return true;
 }

 @Override
 public void onConfirmSave(String absolutePath, String fileName) {
 String path = String.format("%s/%s", absolutePath, fileName);
 BitmapUtil.saveBitmap(path, mBitmap, "jpg", 80);
 Toast.makeText(this, "成功保存图片文件：" + path, Toast.LENGTH_LONG).show();
 }

}