如何显示在新活动中拍摄的图像

Question

只是想知道是否有人可以帮助我解决这个问题，因为我是 java 的主要新手。我想做的是在我按下按钮时拍照，然后让它显示在新的活动中。到目前为止，我所做的工作是当我单击相机打开的按钮时，将照片保存到我的画廊，然后将我带回相同的活动。任何帮助表示赞赏！

这是我的 mainactivity.java 文件

package com.example.appname;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class MainActivity extends Activity {

private File mFileUri;
private final Context mContext = this;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    mFileUri = getOutputMediaFile(1);

    intent.putExtra(MediaStore.EXTRA_OUTPUT, mFileUri);

    // start the image capture Intent
    startActivityForResult(intent, 100);
  }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
    super.onActivityResult(requestCode, resultCode, imageReturnedIntent);

    if (resultCode == RESULT_OK) {
        if (mFileUri != null) {
            String mFilePath = mFileUri.toString();
            if (mFilePath != null) {
                Intent intent = new Intent(mContext, CamActivity.class);
                intent.putExtra("filepath", mFilePath);
                startActivity(intent);



            }
        }
     }               
 }


 // Return image / video
 private static File getOutputMediaFile(int type) {

    // External sdcard location
    File mediaStorageDir = new   File(Environment.getExternalStorageDirectory(), "DCIM/Camera");

    // Create the storage directory if it does not exist
    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            return null;
        }
    }

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());
    File mediaFile;
    if (type == 1) { // image
        mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
    } else if (type == 2) { // video
        mediaFile = new File(mediaStorageDir.getPath() + File.separator + "VID_" + timeStamp + ".mp4");
    } else {
        return null;
    }

    return mediaFile;
 }
}

这是我的 activity_main.xml 文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="#000"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 tools:context="com.example.appname.MainActivity" >

 <Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:minHeight="50dp"
    android:minWidth="120dp"
    android:onClick="@id/activity_cam"
    android:text="@string/LetsBegin" />

  <ImageView
    android:id="@+id/imageView1"
    android:layout_width="200dp"
    android:layout_height="400dp"
    android:layout_below="@+id/button1"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="31dp"
    android:src="@drawable/abc_ab_share_pack_mtrl_alpha" />

 </RelativeLayout>

这是我的 CamActivity.java，上面只有一个图像视图，它是我希望在相机保存照片后显示图像的地方

package com.example.appname;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;

import java.io.File;

public class CamActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_cam);

    Intent intent = getIntent();
    String filepath = intent.getStringExtra("filepath");
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = 8; // down sizing image as it throws OutOfMemory  Exception for larger images
    filepath = filepath.replace("file://", ""); // remove to avoid  BitmapFactory.decodeFile return null
    File imgFile = new File(filepath);
    if (imgFile.exists()) {
        ImageView imageView = (ImageView) findViewById(R.id.imgphoto);
        Bitmap bitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath(),  options);
        imageView.setImageBitmap(bitmap);
      }
   }


}

我的 activity_cam.xml 文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_cam"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.isyourfriendaterrorist.CamActivity" >

<ImageView
    android:id="@+id/imgphoto"
    android:layout_width="200dp"
    android:layout_height="200dp"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:contentDescription="@string/imageview"/>

</RelativeLayout>

Answer 1

您应该具备以下条件：

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
        super.onActivityResult(requestCode, resultCode, imageReturnedIntent);

        if (resultCode == RESULT_OK) {
            if (mFileUri != null) {
                String mFilePath = mFileUri.toString();
                if (mFilePath != null) {
                    Intent intent = new Intent(mContext, SecondActivity.class);
                    intent.putExtra("filepath", mFilePath);
                    startActivity(intent);
                }
            }
        }               
    }

请阅读我对以下问题的示例代码的回答（我使用的是 Android Studio，而不是 Eclipse，但我认为您很容易理解）：

How to move image captured with the phone camera from one activity to an image view in another activity?

希望这会有所帮助！