android  指纹识别调用实现方法及示例代码

activity_main.xml源码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
  android:gravity="center"
  android:orientation="vertical"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context="com.liu.finger.MainActivity"> 

  <TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    android:textSize="18sp" /> 

  <Button
    android:id="@+id/btn_activity_main_finger"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentStart="true"
    android:layout_below="@+id/textView"
    android:layout_marginTop="54dp"
    android:text="指纹识别" />
</LinearLayout> 

MainActivity.java源码

package com.liu.finger; 

import android.Manifest;
import android.app.KeyguardManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.fingerprint.FingerprintManager;
import android.os.Bundle;
import android.os.CancellationSignal;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast; 

public class MainActivity extends FragmentActivity {
  FingerprintManager manager;
  KeyguardManager mKeyManager;
  private final static int REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS = 0;
  private final static String TAG = "finger_log"; 

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    manager = (FingerprintManager) this.getSystemService(Context.FINGERPRINT_SERVICE);
    mKeyManager = (KeyguardManager) this.getSystemService(Context.KEYGUARD_SERVICE);
    Button btn_finger = (Button) findViewById(R.id.btn_activity_main_finger);
    btn_finger.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        if (isFinger()) {
          Toast.makeText(MainActivity.this, "请进行指纹识别", Toast.LENGTH_LONG).show();
          Log(TAG, "keyi");
          startListening(null);
        }
      }
    }); 

  } 

  public boolean isFinger() { 

    //android studio 上，没有这个会报错
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
      Toast.makeText(this, "没有指纹识别权限", Toast.LENGTH_SHORT).show();
      return false;
    }
    Log(TAG, "有指纹权限");
    //判断硬件是否支持指纹识别
    if (!manager.isHardwareDetected()) {
      Toast.makeText(this, "没有指纹识别模块", Toast.LENGTH_SHORT).show();
      return false;
    }
   Log(TAG, "有指纹模块");
    //判断 是否开启锁屏密码 

    if (!mKeyManager.isKeyguardSecure()) {
      Toast.makeText(this, "没有开启锁屏密码", Toast.LENGTH_SHORT).show();
      return false;
    }
    Log(TAG, "已开启锁屏密码");
    //判断是否有指纹录入
    if (!manager.hasEnrolledFingerprints()) {
      Toast.makeText(this, "没有录入指纹", Toast.LENGTH_SHORT).show();
      return false;
    }
    Log(TAG, "已录入指纹"); 

    return true;
  } 

  CancellationSignal mCancellationSignal = new CancellationSignal();
  //回调方法
  FingerprintManager.AuthenticationCallback mSelfCancelled = new FingerprintManager.AuthenticationCallback() {
    @Override
    public void onAuthenticationError(int errorCode, CharSequence errString) {
      //但多次指纹密码验证错误后，进入此方法；并且，不能短时间内调用指纹验证
      Toast.makeText(MainActivity.this, errString, Toast.LENGTH_SHORT).show();
      showAuthenticationScreen();
    } 

    @Override
    public void onAuthenticationHelp(int helpCode, CharSequence helpString) { 

      Toast.makeText(MainActivity.this, helpString, Toast.LENGTH_SHORT).show();
    } 

    @Override
    public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) { 

      Toast.makeText(MainActivity.this, "指纹识别成功", Toast.LENGTH_SHORT).show();
    } 

    @Override
    public void onAuthenticationFailed() {
      Toast.makeText(MainActivity.this, "指纹识别失败", Toast.LENGTH_SHORT).show();
    }
  }; 

  public void startListening(FingerprintManager.CryptoObject cryptoObject) {
    //android studio 上，没有这个会报错
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
      Toast.makeText(this, "没有指纹识别权限", Toast.LENGTH_SHORT).show();
      return;
    }
    manager.authenticate(cryptoObject, mCancellationSignal, 0, mSelfCancelled, null); 

  } 

  /**
   * 锁屏密码
   */
  private void showAuthenticationScreen() { 

    Intent intent = mKeyManager.createConfirmDeviceCredentialIntent("finger", "测试指纹识别");
    if (intent != null) {
      startActivityForResult(intent, REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS);
    }
  } 

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS) {
      // Challenge completed, proceed with using cipher
      if (resultCode == RESULT_OK) {
        Toast.makeText(this, "识别成功", Toast.LENGTH_SHORT).show();
      } else {
        Toast.makeText(this, "识别失败", Toast.LENGTH_SHORT).show();
      }
    }
  } 

  private void Log(String tag, String msg) {
    Log.d(tag, msg);
  }
} 

通过此文希望能帮助开发Android 指纹识别的朋友,谢谢大家对本站的支持！