Android呼叫攝像頭和拍照(相容MIUI系統)
阿新 • • 發佈:2019-02-06
功能:點選一張圖片,彈出對話方塊, 有選擇相簿和拍照兩個選項,得到一張照片後再對照片進行裁剪,然後將照片顯示在圖片控制元件上。
package com.example.pickphoto;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.ImageView;
import java.io.File;
public class MainActivity extends Activity implements View.OnClickListener {
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.photo);
imageView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.photo:
pickphoto();
break ;
}
}
private void pickphoto() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("頭像設定");
builder.setNegativeButton("相簿", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
startActivityForResult(intent, 1);
}
});
builder.setPositiveButton("拍照", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// 拍下的照片會存到SD開下,命名為icon.jpg
Uri mTakePhoto = Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "icon.jpg"));
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, mTakePhoto);
startActivityForResult(intent, 2);
}
});
builder.show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
// 從相簿
case 1:
if (data!=null){
startPhotoZoom(data.getData());
}
break;
// 從拍照
case 2:
try {
// 找到拍下的照片
File temp = new File(Environment.getExternalStorageDirectory()+"/icon.jpg");
startPhotoZoom(Uri.fromFile(temp));
} catch (Exception e) {
e.printStackTrace();
}
break;
// 裁剪後
case 3:
if (data!=null){
setPhotoToView(data);
}
}
}
/** 相片裁剪 再開啟一個意圖*/
private void startPhotoZoom(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri,"image/jpeg");
intent.putExtra("crop","true");
//裁剪框寬高的比例
intent.putExtra("aspectX",1);
intent.putExtra("aspectY",1);
// 裁剪圖片的寬高
intent.putExtra("outputX",100);
intent.putExtra("outputY",100);
intent.putExtra("return-data",true);
startActivityForResult(intent,3);
}
private void setPhotoToView(Intent intent){
Bundle extras = intent.getExtras();
if (extras!=null){
Bitmap photo = extras.getParcelable("data");
imageView.setImageBitmap(photo);
}
}
}
經過測試,發現在MIUI系統手機上選擇照片後不能跳到裁剪介面,原因是intent.getExtras()得到的Bundle為空,修改如下:
// intent.putExtra("return-data", true); //把上文中的這行修改為下文
//解決MIUI 裁剪後的圖片Uri路徑,uritempFile為Uri類變數
uritempFile = Uri.parse("file://" + "/" +activity.getExternalCacheDir().getPath() + "/" + "small.jpg");
LogUtils.w("cache path:"+activity.getExternalCacheDir().getPath());
intent.putExtra(MediaStore.EXTRA_OUTPUT, uritempFile);
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
activity.startActivityForResult(intent, CROP_REQUEST_CODE);
// Bitmap photo = extras.getParcelable("data"); //把上文中的這行修改為下文
//將Uri圖片轉換為Bitmap
Bitmap photo = null;
try {
photo = BitmapFactory.decodeStream(activity.getContentResolver().openInputStream(uritempFile));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
FileProvider使用如下:
//判斷版本
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { //如果在Android7.0以上,使用FileProvider獲取Uri
//這裡如果不走else,相容舊版本 ,就要新增許可權
//intent.setFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
Uri contentUri = FileProvider.getUriForFile(MainActivity.this, getPackageName()+".fileprovider", tempFile);
intent.putExtra(MediaStore.EXTRA_OUTPUT, contentUri);
Log.e("dasd", contentUri.toString());
} else { //否則使用Uri.fromFile(file)方法獲取Uri
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(tempFile));
}
因為FileProvider是四大元件,所以要進行註冊:
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/filepaths" />
</provider>
還要設定一個meta-data,裡面指向一個xml檔案:
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path
name="external"
path="" />
</paths>
其中external-path表示要共享的是SD卡的目錄,name隨便一個不能為空,path為SD卡的子目錄,不指定則為根目錄