java - 以编程方式设置 ImageButton 图像

Question

当我单击 ImageButtonit 时，它提示我从设备中选择一个图像，然后我的目的是将其设置为该按钮的图像。此外，该代码仅在从“照片”检索图像时才有效，因此如果我可以获得一些关于如何使其适用于所有选项的提示，这将是很棒的。

这是我的代码:

package lucas.app_2001;


import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageButton;
import android.widget.RelativeLayout;


public class Shout extends AppCompatActivity {
    ImageButton b1;
    private static final int SELECT_PICTURE = 1;
    String selectedImagePath;
    RelativeLayout myLayout1;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shout);
        b1 = (ImageButton) findViewById(R.id.imageButton);
        myLayout1 = (RelativeLayout) findViewById(R.id.myLayout1);
        findViewById(R.id.imageButton);
               b1.setOnClickListener(new View.OnClickListener() {

                    public void onClick(View arg0) {

                        // in onCreate or any event where your want the user to
                        // select a file
                        Intent intent = new Intent();
                        intent.setType("image/*");
                        intent.setAction(Intent.ACTION_GET_CONTENT);
                        startActivityForResult(Intent.createChooser(intent,
                                "Select Picture"), SELECT_PICTURE);
                    }
                });
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
            if (requestCode == SELECT_PICTURE) {
                Uri selectedImageUri = data.getData();
                selectedImagePath = getPath(selectedImageUri);

                b1.setImageResource(selectedImageUri);
            }
        }
    }

    /**
     * helper to retrieve the path of an image URI
     */
    public String getPath(Uri contentUri) {
            String res = null;
            String[] proj = { MediaStore.Images.Media.DATA };
            Cursor cursor = getContentResolver().query(contentUri, proj, null, null, null);
            if(cursor.moveToFirst()){;
                int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                res = cursor.getString(column_index);
            }
            cursor.close();
            return res;
        }
        }

Answer 1

也许有帮助:

   public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
            if (requestCode == SELECT_PICTURE) {
                Uri selectedImageUri = data.getData();
                selectedImagePath = getPath(selectedImageUri);
                Bitmap myBitmap = BitmapFactory.decodeFile(selectedImagePath);
                b1.setImageBitmap(myBitmap);
            }
        }
    }