我有以下代码有一个应用程序，它要求一个电子邮件地址、一条消息、一个选择图像的按钮和一个图像按钮，只有当应用程序获得一个电子邮件地址、一条消息和一个选择的文件时，它才应该可见。选择的文件应该加载到 imageButton 中。
一旦你按下 imageButton，它现在会显示选择的图像并且是可见的，应用程序应该打开电子邮件应用程序，填写收件人地址、邮件正文并附加选择的图像。
我有以下代码，但我无法将图像传递给电子邮件应用程序。
此外，我无法验证是否已加载图像以使 imageButton 可见。
import java.io.FileNotFoundException;
import java.io.InputStream;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener, TextWatcher {
private static final int REQUEST_CODE = 1;
EditText message;
EditText address;
Button buttonAttach;
ImageButton buttonSend;
String mAdress;
String mMessage;
private InputStream stream;
Bitmap mBitmap;
private ImageView v;
private Uri uri;
private boolean image;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
message = (EditText) findViewById(R.id.emailMessage);
address = (EditText) findViewById(R.id.to_address);
buttonAttach = (Button) findViewById(R.id.choose_button);
buttonSend = (ImageButton) findViewById(R.id.imageButton);
buttonAttach.setOnClickListener(this);
buttonSend.setOnClickListener(this);
message.addTextChangedListener(this);
}
@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;
}
@Override
public void onClick(View view) {
// TODO Auto-generated method stub
//if buttonAttach is pushed, call openGallery method
if (view == buttonAttach){
openGallery();
}
//if buttonSend is pushed, try to get address, message and image
if (view == buttonSend){
try{
String mAddress = address.getText().toString();
String mMessage = message.getText().toString();
Intent i = new Intent(Intent.ACTION_SENDTO, Uri.fromParts("mailto", mAddress, null));
i.putExtra(Intent.EXTRA_TEXT, mMessage);
i.putExtra(Intent.EXTRA_STREAM, uri);
startActivity(i);
}
//if exception is caught, display Toast.
catch(Throwable th){
Toast.makeText(this,"Could not send message: " + th.toString(), Toast.LENGTH_LONG).show();
}
}
}
// openGallery method
private void openGallery() {
// TODO Auto-generated method stub
//Intent to provide a chooser to choose a picture.
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "Choose app..."), REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
image = false;
//if requestCode and resultCode are okay, get data from Intent data
if (requestCode == REQUEST_CODE && resultCode == RESULT_OK){
Uri uri = data.getData();
// Display Toast stating your choice of file.
Toast.makeText(getApplicationContext(), "You chose the file: " + uri.toString(), Toast.LENGTH_LONG).show();
//Try to get the stream and set the image.
try {
stream = getContentResolver().openInputStream(uri);
mBitmap = BitmapFactory.decodeStream(stream);
v = (ImageView) findViewById(R.id.imageButton);
v.setImageBitmap(mBitmap);
//if file not found, display Toast saying it could not open file.
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
Log.e("OnActivityResult", "Could not open file.");
Toast.makeText(getApplicationContext(), "Could not open file.", Toast.LENGTH_LONG).show();
}
}
image = true;
super.onActivityResult(requestCode, resultCode, data);
}
@Override
// After changing text on address or message make image visible.
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
String text = message.getText().toString();
String email = address.getText().toString();
Log.i("afterTextChanged", "Email is:" + email);
Log.i("afterTextChanged", "String text is:" + text);
Animation anim = null;
View view = findViewById(R.id.imageButton);
boolean valid = text.length() > 0 && email.length() > 0;
boolean isVisible = view.getVisibility() == View.VISIBLE;
if (isVisible == valid){
return;
}
if (valid){
view.setVisibility(View.VISIBLE);
anim = AnimationUtils.makeInAnimation(this, true);
}else{
view.setVisibility(View.GONE);
anim = AnimationUtils.makeOutAnimation(this, true);
}
Log.i("Anim", "Animation starting.");
view.startAnimation(anim);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
}
任何帮助，将不胜感激。