java - 如何在 Java 中本地保存文件(截图)？

Question

我的应用程序开发实习即将结束，我被分配从头开始创建应用程序，而不是移植苹果版本。我无法弄清楚如何保存应用内屏幕截图，然后将其保存到设备。我不想在外部保存，因为你不能假设每个人都使用 SD 卡。

这是我的代码，当我点击发送时，我想要生成并保存屏幕截图，这样当我使用我的共享 Intent 时，我可以发送屏幕截图。

import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.ShareActionProvider;
import android.support.v4.view.MenuItemCompat;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.TextView;
import android.widget.EditText;
import android.widget.Toast;
import android.text.TextWatcher;
import android.text.Editable;
import android.graphics.Bitmap;
import android.graphics.Typeface;
import android.content.Intent;
import android.content.Context;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class MainActivity extends ActionBarActivity {
TextView CodexTV;
EditText CodexET;

@Override
public class MainActivity extends ActionBarActivity {
TextView CodexTV;
EditText CodexET;

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

    //Loading our AvianKingdom Codex Font
    Typeface tf = Typeface.createFromAsset(getAssets(), "fonts/WWAvianKingdom-Regular.ttf");
    //Text view label
    CodexET = ((EditText) findViewById(R.id.CodexMessage));
    //REAL-TIME Textview change
    CodexET.addTextChangedListener(new TextWatcher() {
        public void afterTextChanged(Editable s) {   //Convert the Text to String
            String inputText = CodexET.getText().toString();
            CodexTV = ((TextView) findViewById(R.id.CustomFontText));
            CodexTV.setText(inputText);
        }
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            // TODO Auto-generated method stub
        }
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // TODO Auto-generated method stub
        }
    });

    //Applying the font
    CodexET.setTypeface(tf);

    //Screenshot our Codex'ed Image
    CodexET.setOnKeyListener(new OnKeyListener()
    {
        public boolean onKey(View v, int keyCode, KeyEvent event)
        {
            if (event.getAction() == KeyEvent.ACTION_DOWN)
            {
                switch (keyCode)
                {
                    case KeyEvent.KEYCODE_DPAD_CENTER:
                        doShare(getDefaultIntent());
                        captureScreen();
                    case KeyEvent.KEYCODE_ENTER:
                        doShare(getDefaultIntent());
                        captureScreen();
                    default:
                        break;
                }
            }
            return false;
        }
    });
}

// Basic Share Intent to handle Sharing through Applications.
private Intent getDefaultIntent()
{
    Intent intent = new Intent(Intent.ACTION_SEND);
    intent.setType("image/*");
    return intent;
}

private ShareActionProvider mShareActionProvider;

这是用户点击发送时调用的函数:

 //Function for Screenshot and Saving picture.
public Bitmap captureScreen()
{   // Image naming and path.
    String fileName = "DR-Codex.jpg";

    // create bitmap screen capture
    Bitmap bitmap;
    View v1 = CodexET.getRootView();
    v1.setDrawingCacheEnabled(true);
    bitmap = Bitmap.createBitmap(v1.getDrawingCache());
    v1.setDrawingCacheEnabled(false);
    //Start writing to device.
    OutputStream fout = null;
    File imageFile;
    imageFile = new File(getExternalFilesDir(null), fileName);
    try
    {
        //Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
        //intent.setDataAndType(Uri.fromFile(new File(fileName)), "image/*");
        //startActivity(intent);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        bitmap.compress(CompressFormat.JPEG, 90, bos);
        byte[] bitmapdata = bos.toByteArray();

        fout = new FileOutputStream(imageFile);
        fout.write(bitmapdata);
        fout.flush();
        Log.e("File saved yo", "but where");
        fout.close();
    }
    catch (FileNotFoundException e)
    {
        // TODO Auto-generated catch block
        Log.e("File Selector", "The selected file can't be shared: " + fileName);
        e.printStackTrace();
    }
    catch (IOException e)
    {
        // TODO Auto-generated catch block
        Log.e("File Selector", "The selected file can't be shared: " + fileName);
        e.printStackTrace();
    }
    finally {
        //Stuff
    }
    return bitmap;
}


private void doShare(Intent shareintent)
{
    mShareActionProvider.setShareIntent(shareintent);
    invalidateOptionsMenu();
}

似乎使用 Action.Create_Document Intent 我可以创建一个空白文件，但我的屏幕图像仍未生成。

这是应用程序屏幕的样子。

这是最新的报告列表，我相信我已经突出了问题。

Answer 1

有两件事让我印象深刻......

1) 将 .jpg 扩展名添加到您的文件名中。即“DR-CODEX.jpg”

2) 不要保存到私有(private)内部 getFilesDir，因为那样您将因安全问题而无法共享。而是保存到 getExternalFilesDir(null)

编辑

同样由于 getExternalFilesDir，您将需要在 AndroidManifest.xml 中添加以下内容

   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

可能

   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />