下面的代碼可以打開相機
package com.kankanla.e560.m180701_camera;
import android.annotation.SuppressLint;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CaptureRequest;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.util.Arrays;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
mCamera();
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@SuppressLint("MissingPermission")
protected void mCamera() throws CameraAccessException {
SurfaceView surfaceView = findViewById(R.id.surfaceView);
final Surface surface = surfaceView.getHolder().getSurface();
SurfaceHolder surfaceHolder = surfaceView.getHolder();
final CameraManager cameraManager = (CameraManager) getSystemService(CAMERA_SERVICE);
surfaceHolder.addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
cameraManager.openCamera("0", new CameraDevice.StateCallback() {
@Override
public void onOpened(@NonNull final CameraDevice camera) {
try {
camera.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(@NonNull CameraCaptureSession session) {
try {
CaptureRequest.Builder builder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
builder.addTarget(surface);
CaptureRequest captureRequest = builder.build();
session.setRepeatingRequest(captureRequest, new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureStarted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, long timestamp, long frameNumber) {
super.onCaptureStarted(session, request, timestamp, frameNumber);
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed(@NonNull CameraCaptureSession session) {
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onDisconnected(@NonNull CameraDevice camera) {
}
@Override
public void onError(@NonNull CameraDevice camera, int error) {
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
});
}
}
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