android - 当我尝试拍照时,相机不断停止(Android Studio)
问题描述
我试图通过调用相机应用程序拍照。我按照这个关于相机的教程
我的代码是这样的:
public void takePhoto(View view) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
不幸的是,我的应用程序在takePhoto
被调用时崩溃了,我收到了这个错误:
Camera keeps stopping
如果我手动启动相机应用程序,它可以工作。我可以用虚拟相机拍照。我用模拟器。Logcat 设置为详细,但那里没有错误。
活动结果:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
ImageView imageView = (ImageView) findViewById(R.id.imageView);
imageView.setImageBitmap(imageBitmap);
}
}
清单的相关部分:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication">
<application>...</application>
<uses-feature android:name="android.hardware.camera"
android:required="true" />
</manifest>
这是 logcat 输出:
2020-08-04 09:21:41.604 10377-10377/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 10377
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:402)
at android.view.View.performClick(View.java:7125)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access$3500(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
at android.view.View.performClick(View.java:7125)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access$3500(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.lang.SecurityException: Permission Denial: starting Intent { act=android.media.action.IMAGE_CAPTURE cmp=com.android.camera2/com.android.camera.CaptureActivity } from ProcessRecord{e9301ed 10377:com.example.myapplication/u0a134} (pid=10377, uid=10134) with revoked permission android.permission.CAMERA
at android.os.Parcel.createException(Parcel.java:2071)
at android.os.Parcel.readException(Parcel.java:2039)
at android.os.Parcel.readException(Parcel.java:1987)
at android.app.IActivityTaskManager$Stub$Proxy.startActivity(IActivityTaskManager.java:3851)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1705)
at android.app.Activity.startActivityForResult(Activity.java:5192)
at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:676)
at android.app.Activity.startActivityForResult(Activity.java:5150)
at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:663)
at com.example.myapplication.MainActivity.takePhoto(MainActivity.java:46)
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
at android.view.View.performClick(View.java:7125)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access$3500(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: android.os.RemoteException: Remote stack trace:
at com.android.server.wm.ActivityStackSupervisor.checkStartAnyActivityPermission(ActivityStackSupervisor.java:1043)
at com.android.server.wm.ActivityStarter.startActivity(ActivityStarter.java:760)
at com.android.server.wm.ActivityStarter.startActivity(ActivityStarter.java:583)
at com.android.server.wm.ActivityStarter.startActivityMayWait(ActivityStarter.java:1288)
at com.android.server.wm.ActivityStarter.execute(ActivityStarter.java:514)
解决方案
在启动该意图之前,您需要询问用户访问设备摄像头的权限。
所以步骤是这样的
- 检查您的应用是否有权访问相机,如果是,则启动意图
- 如果您没有权限,则在运行时请求权限,如下面的代码所示
- 在许可结果上,只需启动您的意图。
如何请求相机许可的示例
public class MainActivity extends AppCompatActivity {
private static final int PERMISSION_REQUEST_CODE = 200;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (checkPermission()) {
//main logic or main code
// . write your main code to execute, It will execute if the permission is already given.
} else {
requestPermission();
}
}
private boolean checkPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
// Permission is not granted
return false;
}
return true;
}
private void requestPermission() {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.CAMERA},
PERMISSION_REQUEST_CODE);
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case PERMISSION_REQUEST_CODE:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(getApplicationContext(), "Permission Granted", Toast.LENGTH_SHORT).show();
// main logic
} else {
Toast.makeText(getApplicationContext(), "Permission Denied", Toast.LENGTH_SHORT).show();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
showMessageOKCancel("You need to allow access permissions",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermission();
}
}
});
}
}
}
break;
}
}
private void showMessageOKCancel(String message, DialogInterface.OnClickListener okListener) {
new AlertDialog.Builder(MainActivity.this)
.setMessage(message)
.setPositiveButton("OK", okListener)
.setNegativeButton("Cancel", null)
.create()
.show();
}
}
推荐阅读
- r - 如何根据条件为ggplot中的线条着色?
- php - 带有左连接的 MYSQL 查询
- javascript - 如何在 chrome 上使用 javascript 更改默认搜索引擎
- python - 无法使用 pdb 探索 json.loads() 代码
- wordpress - WordPress 多站点 | ROOT 重定向到 SUBFOLDER
- c++ - 修改原始 protobuf 流
- php - SQLSTATE [42S22]:找不到列:1054 Laravel
- xslt - 转换 XML - 形成正确的记录
- python - 立体图像三角点的Opencv步骤
- cloud - 多租户云应用程序中的请求速率限制/节流