java - 如何在应用程序设置中存储图像路径？

Question

您好，我已经做到了，在我的应用程序中，用户可以通过单击将他们定向到画廊的按钮来选择个人资料图片。他们选择了照片，这很好，但一旦我退出应用程序或从多任务中删除，个人资料照片就消失了。我该如何保存它？我知道我需要共享首选项，但我不完全确定如何在代码中使用它。我是初学者。

这是我目前在 main.java 上的代码。它显示了我如何使用代码从图库中选择照片但需要保存该照片:

import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.BitmapFactory;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;


public class Main extends Activity {

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

{
}

        Button buttonLoadImage = (Button) findViewById(R.id.buttonLoadPicture);
        buttonLoadImage.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {

                Intent i = new Intent(
                        Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

                startActivityForResult(i, RESULT_LOAD_IMAGE);
            }
        });;


            Button week1 = (Button) findViewById(R.id.week1button);
            Button week2 = (Button) findViewById(R.id.week2button);
        //Button Sound
        final MediaPlayer buttonSound = MediaPlayer.create(Main.this, R.raw.sound1);


        week1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                buttonSound.start();
                startActivity(new Intent("com.example.timetable.WEEK1"));
            }});

                week2.setOnClickListener(new View.OnClickListener(){

                    @Override
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                        buttonSound.start();
                        startActivity(new Intent("com.example.timetable.WEEK2"));
                    }
        });       

          };

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }




private static int RESULT_LOAD_IMAGE = 1;

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

        if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };

            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();

            ImageView imageView = (ImageView) findViewById(R.id.imageView1);
            imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));

        }


    }
}

Answer 1

在SharedPreference中保存图像路径

SharedPreferences shre = PreferenceManager.getDefaultSharedPreferences(this);
Editor edit=shre.edit();
edit.putString("profilePic", picturePath);
edit.commit();

下次 Activity 开始时，请检查您的 SharedPreference。如果存在，则设置图像。下面的代码可以写在onCreate()中。

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String picturePath = prefs.getString("profilePic", "");
if(!picturePath.equals("")){
      ImageView imageView = (ImageView) findViewById(R.id.imageView1);
      imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}