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android 指纹识别调用实现方法及示例代码

2019年07月24日  | 移动技术网IT编程  | 我要评论

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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！

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