Question

您好我已经做到这一点，以便在我的应用中，用户通过点击按钮将他们引导到他们的图库来选择个人资料图片。他们选择了图片并且很好但是一旦我退出应用程序或从多任务中删除，配置文件图片已经消失。我怎么能保存它？我知道我需要共享的prefs，但我不完全确定如何在代码中使用它。我是初学者。

这是我在main.java上的代码。它显示了我如何使用代码从gallary中选择一张照片以保存该照片：

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();

下次活动开始时，请检查您的SharedPreference。如果存在，请设置图像。以下代码可以写入onCreate（）。

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));
}

如何在应用程序设置中存储图像路径？

1 个答案: