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我正在构建一个小型Android应用程序，让人们通过电子邮件捐赠食物。我正在拍照并将其作为电子邮件附件发送。我知道我正在同时启动两项不同的活动，如果这是应用程序崩溃的问题，是否可以设置意图类型以便允许它使用不同类型的文件或内容（本例中的图片和文本）？还是有其他建议？拍摄照片并通过电子邮件客户端发送问题（Android应用程序）
爪哇：
package com.example.android.foodshare;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
public class Donation extends AppCompatActivity implements View.OnClickListener {
Button submit, open_cam;
EditText company_name;
EditText phone_number;
EditText location;
EditText foodType;
EditText quantity;
ImageView the_food;
File pic;
String companyNameString;
String phoneNumberString;
String locationString;
String foodTypeString;
String quantityString;
String emailTo = "[email protected]";
String emailContent;
String emailSubject;
static final int REQUEST_IMAGE_CAPTURE = 0;
Bitmap imageBitmap;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.donation);
submit = (Button) findViewById(R.id.bSubmit);
open_cam = (Button) findViewById(R.id.bCam);
the_food = (ImageView) findViewById(R.id.ivFood);
company_name = (EditText) findViewById(R.id.etCompName);
phone_number = (EditText) findViewById(R.id.etPhone);
location = (EditText) findViewById(R.id.etLocation);
foodType = (EditText) findViewById(R.id.etFoodType);
quantity = (EditText) findViewById(R.id.etQuantity);
submit.setOnClickListener(this);
open_cam.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bCam:
//more pic handling
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
break;
case R.id.bSubmit:
companyNameString = company_name.getText().toString();
phoneNumberString = phone_number.getText().toString();
locationString = location.getText().toString();
foodTypeString = foodType.getText().toString();
quantityString = quantity.getText().toString();
emailContent = "You have received a Food Pickup Request. Please find details below:\n\n" +
"Name of Organization (or Individual): " + companyNameString + "\n" +
"Telephone Number: " + phoneNumberString + "\n" +
"Location: " + locationString + "\n" +
"Available Food Type: " + foodTypeString + "\n" +
"Quantity Available: " + quantityString;
emailSubject = "New Food Pickup Request From " + companyNameString;
Intent emailIntent = new Intent(Intent.ACTION_SEND);
emailIntent.putExtra(Intent.EXTRA_EMAIL, new String[]{emailTo});
emailIntent.putExtra(Intent.EXTRA_SUBJECT, emailSubject);
emailIntent.putExtra(Intent.EXTRA_TEXT, emailContent);
emailIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(pic));
// new line added
emailIntent.setType("image/png");
startActivity(Intent.createChooser(emailIntent,"Share you on the jobing"));
//need this to prompt email client only
emailIntent.setType("message/rfc822");
try {
startActivity(Intent.createChooser(emailIntent, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(Donation.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
}
break;
} // end of switch statement
};
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
imageBitmap = (Bitmap) extras.get("data");
the_food.setImageBitmap(imageBitmap);
try {
File root = Environment.getExternalStorageDirectory();
if (root.canWrite()){
pic = new File(root, "pic.png");
FileOutputStream out = new FileOutputStream(pic);
imageBitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
}
} catch (IOException e) {
Log.e("BROKEN", "Could not write file " + e.getMessage());
}
}
}
}
堆栈跟踪：
05-11 19：56：00.415 2787年至2787年/ com.example.android.foodshare E/AndroidRuntime：致命异常：主 过程： com.example.android.foodshare，PID：2787 java.lang.NullPointerException：file at android.net.Uri.fromFile（Uri.java:452） at com.example.android.foodshare.Donation.onClick（Donation .java：94） at android.view.View.performClick（View.java:5637） at android.view.View $ PerformClick.run（View.java:22429） at android.os.Handler.handleCallback（Handler.java:751） at android.os.Handler.dispatchMessage（Handler.java:95） at android.os.Looper.loop（Looper.java:154） at android.app.ActivityThread.main（ActivityThread.java:6119） at java.lang.reflect.Method.invoke（Native Method） at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:886） at com.android.internal.os.ZygoteInit.main（ZygoteInit .java：776）
“如果是这样的问题，为什么应用程序崩溃” - 如果应用程序崩溃，请使用LogCat检查Java堆栈跟踪：https://stackoverflow.com/questions/23353173/uncomfort-myapp-has-stopped-how-can-i-solve-this – CommonsWare
好点。我已经发布了堆栈跟踪，知道“文件”组件面临的问题。仍然需要帮助调试:) – Kalid