activity_main.xml源码

<"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！