具体问题如下：
Process: com.beta.myapplication, PID: 32404
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.beta.myapplication/com.beta.myapplication.ui.CameraActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.Camera$Parameters android.hardware.Camera.getParameters()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2612)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2672)
at android.app.ActivityThread.access$900(ActivityThread.java:169)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1432)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:171)
at android.app.ActivityThread.main(ActivityThread.java:5751)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.Camera$Parameters android.hardware.Camera.getParameters()' on a null object reference
at com.beta.myapplication.widget.Fragment.SettingsFragment.passCamera(SettingsFragment.java:48)
at com.beta.myapplication.ui.CameraActivity.initCamera(CameraActivity.java:77)
at com.beta.myapplication.ui.CameraActivity.onCreate(CameraActivity.java:26)
at android.app.Activity.performCreate(Activity.java:6320)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1121)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2565)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2672)
at android.app.ActivityThread.access$900(ActivityThread.java:169)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1432)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:171)
at android.app.ActivityThread.main(ActivityThread.java:5751)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
解决方法动态添加相机权限即可。
dependencies{
implementation 'me.weyye.hipermission:library:1.0.7'
}
写入方法在你点击相机那个按钮处添加即可，如果不会用请参考一行代码搞定漂亮的Android6.0权限申请界面
//动态获取手机状态和发送短信权限
private void Permissionx() {
List<PermissionItem> permissions = new ArrayList<PermissionItem>();
permissions.add(new PermissionItem(Manifest.permission.SEND_SMS, getString(R.string.permission_send_sms_phone), R.drawable.permission_ic_sms));
permissions.add(new PermissionItem(Manifest.permission.READ_PHONE_STATE, getString(R.string.permission_read_phone_state), R.drawable.permission_ic_phone));
permissions.add(new PermissionItem(Manifest.permission.CAMERA,"允许打开相机",R.drawable.permission_ic_camera));
HiPermission.create(mContext)
.title(getString(R.string.permission_cus_title))
.permissions(permissions)
.msg(getString(R.string.permission_cus_msg))
.animStyle(R.style.PermissionAnimModal)
.style(R.style.PermissionDefaultGreenStyle)
.checkMutiPermission(new PermissionCallback() {
@Override
public void onClose() {
Log.i(TAG, "onClose");
showToast(getString(R.string.permission_on_close));
}
@Override
public void onFinish() {
showToast(getString(R.string.permission_completed));
}
@Override
public void onDeny(String permission, int position) {
Log.i(TAG, "onDeny");
}
@Override
public void onGuarantee(String permission, int position) {
Log.i(TAG, "onGuarantee");
}
});
}
private void showToast(String text) {//简化Toast
Toast.makeText(mContext, text, Toast.LENGTH_SHORT).show();
}
public static final String TAG = "RegisterActivity";
别忘了在manifests中也添加权限
//开启相机的权限
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 举报，一经查实，本站将立刻删除。
文章由极客之音整理，本文链接：https://www.bmabk.com/index.php/post/134138.html
