我是Android Studio的新手。我正在尝试将EditMessage和EditSendTo个活动中的数据发送到我的TestExplicitIntents活动。这是一个学校项目，但我要求的只是创建EditSendTo活动并在TestExplicitIntents活动中显示电话号码。
我可以在其他活动的课程之后执行此操作，但我想学习如何显示来自两个编辑活动的数据。我尝试了几种方法，但是一旦按下EditMessage按钮，我尝试的所有内容都会以EditSendTo或null生成Done结果结束。
public class TestExplicitIntents extends Activity {
public static final String CLASS_TAG = "TestExplicitIntents";
public static final int NEW_MESSAGE_REQUEST = 1;
public static final int NEW_PHONE_REQUEST = 1;
private String message = "";
private String phone = "";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_explicit_intents);
// Getting to the views defined in the XML files.
TextView tvMessageDetails = (TextView) findViewById(R.id.tvMessageDetails);
tvMessageDetails.setBackgroundColor(Color.GREEN);
tvMessageDetails.setMovementMethod(new ScrollingMovementMethod());
message ="Is it St. Patricks Day?";
phone = "";
setSummary();
// Responding to an event - the onClick for the Edit Message Button
// Using a named inner class
Button btnEditMessage;
btnEditMessage = (Button) this.findViewById(R.id.btnEditMessage);
HandleButtonEditMessageOnClick buttonEditMessageOnClick;
buttonEditMessageOnClick = new HandleButtonEditMessageOnClick();
btnEditMessage.setOnClickListener(buttonEditMessageOnClick);
// Responding to an event - the onClick for the Edit Send To Button
// Using a named inner class
Button btnEditSendTo;
btnEditSendTo = (Button) this.findViewById(R.id.btnEditSendTo);
HandleButtonEditSendToOnClick buttonEditSendToOnClick;
buttonEditSendToOnClick = new HandleButtonEditSendToOnClick();
btnEditSendTo.setOnClickListener(buttonEditSendToOnClick);
}
/**
* Put together a summary of the phone and message and display it.
*/
private void setSummary() {
StringBuilder summary;
summary = new StringBuilder("Sending To:\n");
summary.append(phone);
summary.append("\n\nMessage:\n");
summary.append(message);
TextView tvMessageDetails = (TextView) findViewById(R.id.tvMessageDetails);
tvMessageDetails.setText(summary);
}
/**
* Handle Edit Button OnClick by starting the activity This is an example of
* starting another activity using an explicit Intent.
*
*/
@SuppressWarnings("rawtypes")
public class HandleButtonEditMessageOnClick implements OnClickListener {
public static final String CLASS_TAG = "HandleButtonEditMessageOnClick";
public void onClick(View v) {
Log.i(CLASS_TAG, "onClick started...");
// Example of an EXPLICIT intent, as we are naming the java class to use
// (EditMessage.class)
Intent editIntent;
Activity sourceActivity;
Class destinationClass;
sourceActivity = TestExplicitIntents.this;
destinationClass = EditMessage.class;
editIntent = new Intent(sourceActivity, destinationClass);
// Sending information to the intent receiver through the Intent object
editIntent.putExtra("CURRENT_MESSAGE", TestExplicitIntents.this.message);
//startActivity(editIntent);
startActivityForResult(editIntent, NEW_MESSAGE_REQUEST);
}
}
@SuppressWarnings("rawtypes")
public class HandleButtonEditSendToOnClick implements OnClickListener {
public static final String CLASS_TAG = "HandleButtonEditSendToOnClick";
public void onClick(View v) {
Log.i(CLASS_TAG, "onClick started...");
Intent editSendIntent;
Activity startActivity;
Class endClass;
startActivity = TestExplicitIntents.this;
endClass = EditSendTo.class;
editSendIntent = new Intent(startActivity, endClass);
// Sending information to the intent receiver through the Intent object
editSendIntent.putExtra("CURRENT_PHONE", TestExplicitIntents.this.phone);
//startActivity(editIntent);
startActivityForResult(editSendIntent, NEW_PHONE_REQUEST);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
super.onActivityResult(requestCode, resultCode, data);
String newMessage = getIntent().getStringExtra("NEW_MESSAGE");
String curMessage = getIntent().getStringExtra("CURRENT_MESSAGE");
String newPhone = getIntent().getStringExtra("NEW_PHONE");
String curPhone = getIntent().getStringExtra("CURRENT_PHONE");
// Check which request we're responding to
if (requestCode == NEW_MESSAGE_REQUEST) {
// Make sure the request was successful
if (resultCode == RESULT_OK) {
message = newMessage;
phone = curPhone;
setSummary();
}
}
if (requestCode == NEW_PHONE_REQUEST) {
if (resultCode == RESULT_OK) {
message = curMessage;
phone = newPhone;
setSummary();
}
}
}
}
以下是EditMessage：
public class EditMessage extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit_message);
// Get the intent for this activity. Every activity has an intent and
// set the EditText contents to the string in the extra info that comes with
// the intent
Intent editIntent;
EditText etMessage;
editIntent = this.getIntent();
String theMessage;
theMessage = editIntent.getStringExtra("CURRENT_MESSAGE");
etMessage = (EditText) this.findViewById(R.id.etMessage);
etMessage.setText(theMessage);
// Get an event handler going for the Done button so that we can return the
// new message
Button btnDone = (Button) this.findViewById(R.id.btnDone);
btnDone.setOnClickListener(new ButtonDoneOnClickHandler());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_edit_message, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Handles the Button Done onClick event by creating a resulting Intent and
* finishing
*/
private class ButtonDoneOnClickHandler implements OnClickListener {
public void onClick(View v) {
Intent intent = new Intent();
intent.putExtra("NEW_MESSAGE", ((EditText) findViewById(R.id.etMessage)).getText().toString());
setResult(RESULT_OK, intent);
finish();
}
}
}
以下是EditSendTo：
public class EditSendTo extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit_send_to);
// Get the intent for this activity. Every activity has an intent and
// set the EditText contents to the string in the extra info that comes with
// the intent
Intent editIntent;
EditText etPhone;
editIntent = this.getIntent();
String thePhone;
thePhone = editIntent.getStringExtra("CURRENT_PHONE");
etPhone = (EditText) this.findViewById(R.id.etPhone);
etPhone.setText(thePhone);
// Get an event handler going for the Done button so that we can return the
// new message
Button btnDone = (Button) this.findViewById(R.id.btnDone);
btnDone.setOnClickListener(new ButtonDoneOnClickHandler());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_edit_send_to, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Handles the Button Done onClick event by creating a resulting Intent and
* finishing
*/
private class ButtonDoneOnClickHandler implements OnClickListener {
public void onClick(View v) {
Intent intent = new Intent();
intent.putExtra("NEW_PHONE", ((EditText)
findViewById(R.id.etPhone)).getText().toString());
setResult(RESULT_OK, intent);
finish();
}
}
}
我试图解决这个问题几天，没有找到答案 我真的很感激指向正确的方向。
答案 0 :(得分：0)
您的代码应如下所示：
TestExplicitIntents.java
public class TestExplicitIntents extends Activity {
public static final String CLASS_TAG = "TestExplicitIntents";
public static final int NEW_MESSAGE_REQUEST = 1;
public static final int NEW_PHONE_REQUEST = 2;
private String message = "";
private String phone = "";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_explicit_intents);
// Getting to the views defined in the XML files.
TextView tvMessageDetails = (TextView) findViewById(R.id.tvMessageDetails);
tvMessageDetails.setBackgroundColor(Color.GREEN);
tvMessageDetails.setMovementMethod(new ScrollingMovementMethod());
message = "Is it St. Patricks Day?";
phone = "";
setSummary();
// Responding to an event - the onClick for the Edit Message Button
// Using a named inner class
Button btnEditMessage;
btnEditMessage = (Button) this.findViewById(R.id.btnEditMessage);
HandleButtonEditMessageOnClick buttonEditMessageOnClick;
buttonEditMessageOnClick = new HandleButtonEditMessageOnClick();
btnEditMessage.setOnClickListener(buttonEditMessageOnClick);
// Responding to an event - the onClick for the Edit Send To Button
// Using a named inner class
Button btnEditSendTo;
btnEditSendTo = (Button) this.findViewById(R.id.btnEditSendTo);
HandleButtonEditSendToOnClick buttonEditSendToOnClick;
buttonEditSendToOnClick = new HandleButtonEditSendToOnClick();
btnEditSendTo.setOnClickListener(buttonEditSendToOnClick);
}
/**
* Put together a summary of the phone and message and display it.
*/
private void setSummary() {
StringBuilder summary;
summary = new StringBuilder("Sending To:\n");
summary.append(phone);
summary.append("\n\nMessage:\n");
summary.append(message);
TextView tvMessageDetails = (TextView) findViewById(R.id.tvMessageDetails);
tvMessageDetails.setText(summary);
}
/**
* Handle Edit Button OnClick by starting the activity This is an example of
* starting another activity using an explicit Intent.
*/
@SuppressWarnings("rawtypes")
public class HandleButtonEditMessageOnClick implements View.OnClickListener {
public static final String CLASS_TAG = "HandleButtonEditMessageOnClick";
public void onClick(View v) {
Log.i(CLASS_TAG, "onClick started...");
// Example of an EXPLICIT intent, as we are naming the java class to use
// (EditMessage.class)
Intent editIntent;
Activity sourceActivity;
Class destinationClass;
sourceActivity = TestExplicitIntents.this;
destinationClass = EditMessage.class;
editIntent = new Intent(sourceActivity, destinationClass);
// Sending information to the intent receiver through the Intent object
editIntent.putExtra("CURRENT_MESSAGE", TestExplicitIntents.this.message);
//startActivity(editIntent);
startActivityForResult(editIntent, NEW_MESSAGE_REQUEST);
}
}
@SuppressWarnings("rawtypes")
public class HandleButtonEditSendToOnClick implements View.OnClickListener {
public static final String CLASS_TAG = "HandleButtonEditSendToOnClick";
public void onClick(View v) {
Log.i(CLASS_TAG, "onClick started...");
Intent editSendIntent;
Activity startActivity;
Class endClass;
startActivity = TestExplicitIntents.this;
endClass = EditSendTo.class;
editSendIntent = new Intent(startActivity, endClass);
// Sending information to the intent receiver through the Intent object
editSendIntent.putExtra("CURRENT_PHONE", TestExplicitIntents.this.phone);
//startActivity(editIntent);
startActivityForResult(editSendIntent, NEW_PHONE_REQUEST);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Check which request we're responding to
if (requestCode == NEW_MESSAGE_REQUEST) {
// Make sure the request was successful
if (resultCode == RESULT_OK) {
message = data.getStringExtra("NEW_MESSAGE");
setSummary();
}
} else if (requestCode == NEW_PHONE_REQUEST) {
if (resultCode == RESULT_OK) {
phone = data.getStringExtra("NEW_PHONE");
setSummary();
}
}
}
}
EditSendTo类：
public class extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit_send_to);
// Get the intent for this activity. Every activity has an intent and
// set the EditText contents to the string in the extra info that comes with
// the intent
Intent editIntent;
EditText etPhone;
editIntent = this.getIntent();
String thePhone;
thePhone = editIntent.getStringExtra("CURRENT_PHONE");
etPhone = (EditText) this.findViewById(R.id.etPhone);
etPhone.setText(thePhone);
// Get an event handler going for the Done button so that we can return the
// new message
Button btnDone = (Button) this.findViewById(R.id.btnDone);
btnDone.setOnClickListener(new ButtonDoneOnClickHandler());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
//getMenuInflater().inflate(R.menu.menu_edit_send_to, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Handles the Button Done onClick event by creating a resulting Intent and
* finishing
*/
private class ButtonDoneOnClickHandler implements View.OnClickListener {
public void onClick(View v) {
Intent intent = new Intent();
intent.putExtra("NEW_PHONE", ((EditText)
findViewById(R.id.etPhone)).getText().toString());
setResult(RESULT_OK, intent);
finish();
}
}
}
EditMessage类：
public class EditMessage extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit_message);
// Get the intent for this activity. Every activity has an intent and
// set the EditText contents to the string in the extra info that comes with
// the intent
Intent editIntent;
EditText etMessage;
editIntent = this.getIntent();
String theMessage;
theMessage = editIntent.getStringExtra("CURRENT_MESSAGE");
etMessage = (EditText) this.findViewById(R.id.etMessage);
etMessage.setText(theMessage);
// Get an event handler going for the Done button so that we can return the
// new message
Button btnDone = (Button) this.findViewById(R.id.btnDone);
btnDone.setOnClickListener(new ButtonDoneOnClickHandler());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
// getMenuInflater().inflate(R.menu.menu_edit_message, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Handles the Button Done onClick event by creating a resulting Intent and
* finishing
*/
private class ButtonDoneOnClickHandler implements View.OnClickListener {
public void onClick(View v) {
Intent intent = new Intent();
intent.putExtra("NEW_MESSAGE", ((EditText) findViewById(R.id.etMessage)).getText().toString());
setResult(RESULT_OK, intent);
finish();
}
}
}