java - 如何使用图像路径将图像从一个 Activity 传递到另一个 Activity ？

Question

我有 2 个 Activity 。 1，其中我使用相机捕获图像并将其保存在内存中，并使用路径在 imageview 中显示图像。所以我想在第二个 Activity 的另一个 ImageView 中再次显示相同的图像。我该怎么做？

这是第一个 Activity

package com.example.shiva_000.myproject;

import android.app.Activity;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.media.Image;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;

import java.io.File;
import java.net.URI;

public class MainActivity extends Activity {
    public static final String Tag_Price ="tag";
    public static final String TAG_Radio ="Button";
    private String SelectedType ="";
    String path = "sdcard/camera_app/cam_image.jpg";

    EditText et;

    Button button;
    ImageView imageView;
    // Radio button
    Button button2;
    RadioGroup radio_g;
    RadioButton rb1, rb2;



    static final int cam_request = 1;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button =(Button) findViewById(R.id.button1);
        imageView =(ImageView) findViewById(R.id.image_view);
        button2 = (Button) findViewById(R.id.submit);
        et =(EditText) findViewById(R.id.editText);
        radio_g=(RadioGroup) findViewById(R.id.rg1);
        final RadioButton rb1 = (RadioButton) findViewById(R.id.newoption);
        final RadioButton rb2 = (RadioButton) findViewById(R.id.usedoption);


// on click for submit
        button2.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {





                String s = et.getText().toString();
                Intent i = new Intent(MainActivity.this,secondScreen.class);
                i.putExtra("Condition",SelectedType);
                i.putExtra("Price",s);
               i.putExtra("image",path);


                startActivity(i);



            }
        });


// on click for capture image
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent camera_Intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                File file = getFile();
                camera_Intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
                startActivityForResult(camera_Intent, cam_request);

            }

        });


//launchSecondActivity(Double.parseDouble(et.getText().toString()),null);

    }
//private void launchSecondActivity(double price ,Image image){



    // }
    public void Condition(View view) {

        boolean checked = ((RadioButton) view).isChecked();
        switch(view.getId()) {
            case R.id.newoption:
                if (checked)
                    //SelectedType = rb1.getText().toString();

                    break;
            case R.id.usedoption:
                if (checked)
                   // SelectedType = rb2.getText().toString();

                    break;
        }
    }

    private File getFile()
    {
        File folder = new File("sdcard/camera_app");

        if (!folder.exists())
        {
            folder.mkdir();
        }

        File image_file = new File(folder,"cam_image.jpg");
        return image_file;


// return null;

    }


// public void

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       // String path = "sdcard/camera_app/cam_image.jpg";
        imageView.setImageDrawable(Drawable.createFromPath(path));
    }

//private void launchSecondActivity(condion , ){

//}
}

这是第二个 Activity

package com.example.shiva_000.myproject;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.TextView;

/**
 * Created by shiva_000 on 11/18/2015.
 */
public class secondScreen extends Activity {
    ImageView imageView;
    TextView textView1;
    TextView textView2;
    Button button;


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

        imageView =(ImageView) findViewById(R.id.image_view);
        textView1 =(TextView) findViewById(R.id.textView4);
        textView2 =(TextView) findViewById(R.id.textView5);
        button = (Button)findViewById(R.id.button2);
        Intent ii = getIntent();
        Bundle b = ii.getExtras();

        if (b!=null)
        {
            String passed_condition = (String) b.get("Condition");
            String passed_price = (String) b.get("Price");
            //String passed_image = getIntent().getStringExtra("imagePath");
            textView1.setText("Condition : " + passed_condition);
            textView2.setText("The price is : " + passed_price + "$");
            //Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
            String image = ii.getStringExtra("image");
            //imageView.setImageDrawable();
        }

        //button.setOnClickListener();
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

        //String path = getIntent().getStringExtra("")






    }




  //  private void initializesecondactivity ()
    //{
       // double price = getIntent().getExtras().getDouble(MainActivity.Tag_Price);

   // }


}

Answer 1

嘿 Shiva，这里有很多选项，第一个是从 url 创建文件，然后是位图并将其传递给 ImageView

我推荐它使用图像加载器库的第二个解决方案，它在本地或远程图像加载的情况下很有帮助，我认为最好的库是 Glide image loader

在获取图像路径后的第二个 Activity 中，您可以添加这两个选项之一

String image = ii.getStringExtra("image");
File imgFile = new  File(image);

    if(imgFile.exists()){

        Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());

        ImageView myImage = (ImageView) findViewById(R.id.imageviewTest);

        myImage.setImageBitmap(myBitmap);

    }

或

 File imgFile = new  File(image);
    Glide.with(getApplicationContext()).load(imgFile).into(imageview);

这是旋转位图的代码

Matrix matrix = new Matrix();
      matrix.postRotate(180);
      Bitmap b=Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);