拍照

布局文件<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.takephoto.MainActivity">    <Button        android:text="拍照"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:layout_margin="10dp"        android:id="@+id/button"        android:onClick="takePhone"         />    <Button        android:text="相册选择"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:layout_margin="10dp"        android:onClick="choosePhone"        />    <ImageView        android:layout_width="match_parent"        android:layout_height="0dp"        android:id="@+id/image"        android:src="@color/colorAccent"        android:scaleType="centerCrop"        android:layout_weight="7"/></LinearLayout>12345678910111213141516171819202122232425262728293031323334351234567891011121314151617181920212223242526272829303132333435MainActivity代码public class MainActivity extends AppCompatActivity {    private ImageView imageView;    private static final int CROP_PHOTO = 2;    private static final int REQUEST_CODE_PICK_IMAGE=3;    private static final int MY_PERMISSIONS_REQUEST_CALL_PHONE = 6;    private static final int MY_PERMISSIONS_REQUEST_CALL_PHONE2 = 7;    private  File output;    private Uri imageUri;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    void initView(){        imageView=(ImageView)findViewById(R.id.image);    }    public void takePhone(View view){        if (ContextCompat.checkSelfPermission(this,                Manifest.permission.WRITE_EXTERNAL_STORAGE)                != PackageManager.PERMISSION_GRANTED)        {            ActivityCompat.requestPermissions(this,                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},                    MY_PERMISSIONS_REQUEST_CALL_PHONE2);        }else {            takePhoto();        }    }    public void choosePhone(View view){        if (ContextCompat.checkSelfPermission(this,                Manifest.permission.WRITE_EXTERNAL_STORAGE)                != PackageManager.PERMISSION_GRANTED)        {            ActivityCompat.requestPermissions(this,                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},                    MY_PERMISSIONS_REQUEST_CALL_PHONE2);        }else {            choosePhoto();        }    }    /**     * 拍照     */    void takePhoto(){        /**         * 最后一个参数是文件夹的名称，可以随便起         */        File file=new File(Environment.getExternalStorageDirectory(),"拍照");        if(!file.exists()){            file.mkdir();        }        /**         * 这里将时间作为不同照片的名称         */        output=new File(file,System.currentTimeMillis()+".jpg");        /**         * 如果该文件夹已经存在，则删除它，否则创建一个         */        try {            if (output.exists()) {                output.delete();            }            output.createNewFile();        } catch (Exception e) {            e.printStackTrace();        }        /**         * 隐式打开拍照的Activity，并且传入CROP_PHOTO常量作为拍照结束后回调的标志         */        imageUri = Uri.fromFile(output);        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);        startActivityForResult(intent, CROP_PHOTO);    }    /**     * 从相册选取图片     */    void choosePhoto(){        /**         * 打开选择图片的界面         */        Intent intent = new Intent(Intent.ACTION_PICK);        intent.setType("image/*");//相片类型        startActivityForResult(intent, REQUEST_CODE_PICK_IMAGE);    }    public void onActivityResult(int req, int res, Intent data) {        switch (req) {            /**             * 拍照的请求标志             */            case CROP_PHOTO:                if (res==RESULT_OK) {                    try {                        /**                         * 该uri就是照片文件夹对应的uri                         */                        Bitmap bit = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));                        imageView.setImageBitmap(bit);                    } catch (Exception e) {                        Toast.makeText(this,"程序崩溃",Toast.LENGTH_SHORT).show();                    }                }                else{                    Log.i("tag", "失败");                }                break;            /**             * 从相册中选取图片的请求标志             */            case REQUEST_CODE_PICK_IMAGE:                if (res == RESULT_OK) {                    try {                        /**                         * 该uri是上一个Activity返回的                         */                        Uri uri = data.getData();                        Bitmap bit = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));                        imageView.setImageBitmap(bit);                    } catch (Exception e) {                        e.printStackTrace();                        Log.d("tag",e.getMessage());                        Toast.makeText(this,"程序崩溃",Toast.LENGTH_SHORT).show();                    }                }                else{                    Log.i("liang", "失败");                }                break;            default:                break;        }    }    @Override    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults)    {        if (requestCode == MY_PERMISSIONS_REQUEST_CALL_PHONE)        {            if (grantResults[0] == PackageManager.PERMISSION_GRANTED)            {               takePhoto();            } else            {                // Permission Denied                Toast.makeText(MainActivity.this, "Permission Denied", Toast.LENGTH_SHORT).show();            }        }        if (requestCode == MY_PERMISSIONS_REQUEST_CALL_PHONE2)        {            if (grantResults[0] == PackageManager.PERMISSION_GRANTED)            {                choosePhoto();            } else            {                // Permission Denied                Toast.makeText(MainActivity.this, "Permission Denied", Toast.LENGTH_SHORT).show();            }        }        super.onRequestPermissionsResult(requestCode, permissions, grantResults);    }}