本篇文章为大家展示了Android中怎么实现指纹功能，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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package com.tsm.test;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.KeyguardManager;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.support.v4.hardware.fingerprint.FingerprintManagerCompat;
import android.support.v4.os.CancellationSignal;
/**
* Created by tsm on 2017/3/20.
*
* 指纹识别功能
*
* 如果创建了该类的实例,必须调用 stopsFingerPrintListen 方法
*
* 添加权限
*
*
*/
public class FingerPrintUiHelper extends FingerprintManagerCompat.AuthenticationCallback {
private final FingerPrintCallBack callback;
private CancellationSignal signal;
private FingerprintManagerCompat fingerprintManager;
/**
* 如果失败次数过多,调用系统的startActivityForResult
* 这个是code
*/
public static final int REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS = 10;
/**
* 用于提示用户还可以尝试几次,比较友好
*/
private int count;
/**
* 控制是否开启过指纹功能
*/
public boolean isStartFinger;
/**
* 初始化指纹功能
* @param activity
* @param callback
*/
public FingerPrintUiHelper(Activity activity, FingerPrintCallBack callback) {
this.callback = callback;
signal = new CancellationSignal();
fingerprintManager = FingerprintManagerCompat.from(activity);
isStartFinger = false;
if (!fingerprintManager.isHardwareDetected()) {
if (callback != null)
callback.doNotSupportFinger();
return;
}
if (!fingerprintManager.hasEnrolledFingerprints()) {
if (callback != null)
callback.FingerClosed();
}
}
/**
* 开始扫描指纹
*/
public void startFingerPrintListen() {
count = 5;
isStartFinger = true;
fingerprintManager.authenticate(null, 0, signal, this, null);
}
/**
* 初始化未必调用 startFingerPrintListen
* 所以添加变量控制
*/
public void stopsFingerPrintListen() {
if (isStartFinger) {
if (signal != null && !signal.isCanceled()) {
signal.cancel();
}
}
}
/**
* 识别成功
* @param result
*/
@Override
public void onAuthenticationSucceeded(FingerprintManagerCompat.AuthenticationResult result) {
if (callback != null)
callback.onAuthenticationSucceeded();
}
/**
* 识别失败
*/
@Override
public void onAuthenticationFailed() {
count--;
if (count > 0) {
if (callback != null)
callback.onAuthenticationFailed(count);
return;
}
}
/**
* 有错误
* @param errMsgId
* @param errString
*/
@Override
public void onAuthenticationError(int errMsgId, CharSequence errString) {
if (errMsgId == 5) {
if (callback != null)
callback.FingerClosed();
return;
}
if (errMsgId == 7) {
if (callback != null)
callback.onAuthenticationError();
return;
}
}
/**
* 多次调用指纹识别失败后,调用此方法
*
* @param activity
*/
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public static void jumpToGesturePassCheck(Activity activity) {
KeyguardManager keyguardManager =
(KeyguardManager) activity.getSystemService(Context.KEYGUARD_SERVICE);
Intent intent =
keyguardManager.createConfirmDeviceCredentialIntent("finger", "测试指纹识别");
activity.startActivityForResult(intent, REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS);
}
interface FingerPrintCallBack {
/**
* 识别成功
*/
void onAuthenticationSucceeded();
/**
* 识别失败
*
* @param count 还可以尝试的次数
* @param count
*/
void onAuthenticationFailed(int count);
/**
* 失败次数过多
*/
void onAuthenticationError();
/**
* 未开启指纹功能
*/
void FingerClosed();
/**
* 不支持指纹功能
*/
void doNotSupportFinger();
}
}
这个是工具类,下面上使用方法
package com.tsm.test;
import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity implements FingerPrintUiHelper.FingerPrintCallBack {
private FingerPrintUiHelper fingerPrintUiHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {////指纹功能是23之后的版本才有的
initFingerPrint();
Button button = (Button) findViewById(R.id.button);
assert button != null;
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
fingerPrintUiHelper.startFingerPrintListen();
}
});
findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
fingerPrintUiHelper.stopsFingerPrintListen();
}
});
}
}
private void initFingerPrint() {
fingerPrintUiHelper = new FingerPrintUiHelper(this, this);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == FingerPrintUiHelper.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();
// jumpToMain2Activity();
} else {
Toast.makeText(this, "识别失败", Toast.LENGTH_SHORT).show();
}
}
}
@Override
protected void onDestroy() {
if (fingerPrintUiHelper != null)
fingerPrintUiHelper.stopsFingerPrintListen();
super.onDestroy();
}
/**
* 成功
*/
@Override
public void onAuthenticationSucceeded() {
Toast.makeText(this, "识别成功", Toast.LENGTH_SHORT).show();
}
@Override
public void onAuthenticationFailed(int count) {
String msg = "您还可以尝试%d次";
Toast.makeText(this, String.format(msg, count), Toast.LENGTH_SHORT).show();
}
/**
* 验证失败,走密码验证
*/
@Override
public void onAuthenticationError() {
FingerPrintUiHelper.jumpToGesturePassCheck(this);
}
/**
* 没有指纹功能
*/
@Override
public void FingerClosed() {
//TODO 可以写一个Dialog跳转设置页,这里我就不写了
Toast.makeText(this, "指纹功能已关闭", Toast.LENGTH_SHORT).show();
}
@Override
public void doNotSupportFinger() {
Log.i("info", "-------------doNotSupportFinger--------------------");
Toast.makeText(this, "该设备不支持指纹功能", Toast.LENGTH_SHORT).show();
}
}最后添加权限:
上述内容就是Android中怎么实现指纹功能，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注创新互联行业资讯频道。
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