Question

该应用程序有一个订单按钮，当点击它时应该打开gmail应用程序主题和正文提交，但我的代码中的意图不起作用，应用程序显示一个消息，它不幸停止。我已经尝试了很多方法来实现它，但我无法这样做。

package com.example.android.justjava;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import java.text.NumberFormat;

import static android.R.attr.value;
import static android.R.id.checkbox;
import static android.R.id.message;

/**
 * This app displays an order form to order coffee.
 */
public class MainActivity extends AppCompatActivity {

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

    int topping_price = 0;
    /**
     * This method is called when the order button is clicked.
     */
    public void submitOrder(View view) {
        String variable1,variable2,variable3;
        CheckBox cream = (CheckBox) findViewById(R.id.checkbox);
        CheckBox choco = (CheckBox) findViewById(R.id.checkbox_choco);
        boolean value1 = cream.isChecked();
        boolean value2 = choco.isChecked();

        if(value1 == true) {
            variable1 = "Yes";
            topping_price += 1;
        }
        else
            variable1 = "No" ;

        if(value2 == true) {
            variable2 = "Yes";
            topping_price += 2;
        }

        else
            variable2 = "No" ;

        EditText input_name = (EditText) findViewById(R.id.name);
        variable3 = input_name.getText().toString();

        if((quantity + count) == 0){
            topping_price = 0;
            variable1 = "No";
            variable2 = "No";
        }

        String price_message = "Whipped cream topping: " + variable1 + "\nChocolate topping: " + variable2 +"\nName: " + variable3 +"\nQuantity: " + (quantity + count) +"\nTotal $" + (( quantity + count ) * 10 + topping_price ) + "\nThank You";
        displayMessage(price_message);
        topping_price = 0 ;

        Intent sendIntent = new Intent(Intent.ACTION_SENDTO);
        sendIntent.setType("*/*");
        sendIntent.setData(Uri.parse("masquerade0097@gmail.com"));
        sendIntent.setClassName("com.google.android.gm", "com.google.android.gm.ComposeActivityGmail");
        sendIntent.putExtra(Intent.EXTRA_EMAIL, new String[] { "masquerade0097@gmail.com" });
        sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Just Java order for " + variable3);
        sendIntent.putExtra(Intent.EXTRA_TEXT,"Whipped cream topping: " + variable1 + "\nChocolate topping: " + variable2 +"\nName: " + variable3 +"\nQuantity: " + (quantity + count) +"\nTotal $" + (( quantity + count ) * 10 + topping_price ) + "\nThank You");
//        startActivity(sendIntent);
        if (sendIntent.resolveActivity(getPackageManager()) != null) {
            startActivity(sendIntent);
        }    
    }

    /**
     * This method displays the given text on the screen.
     */
    private void displayMessage(String message) {
        TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
        priceTextView.setText(message);
    }

    int quantity = 1;
    int count = 0;

    public void increment(View view){
        if((quantity + count) < 101)
            count = count + 1;
        display(quantity + count );
        displayPrice( (quantity + count) * 10);
    }

    public void decrement(View view){

        if((quantity + count) != 0)
            count = count - 1;

        display(quantity + count);
        displayPrice((quantity + count) * 10);

    }
    /**
     * This method displays the given quantity value on the screen.
     */
    private void display(int number) {
        TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
        quantityTextView.setText("" + number);
    }

    private void displayPrice(int number){
        TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
        priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
    }
}

Answer 1

您可以尝试使用此代码。这将打开选择器，您可以从中选择gmail app。

Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("message/rfc822");
intent.putExtra(Intent.EXTRA_TEXT, "Text you want to share");
startActivity(Intent.createChooser(intent, "Send mail..."));

Answer 2

如果您特别想打开gmail应用，请使用此

Intent sendIntent = new Intent(Intent.ACTION_VIEW);
sendIntent.setData(Uri.parse("test@gmail.com"));
sendIntent.setClassName("com.google.android.gm","com.google.android.gm.ComposeActivityGmail");
sendIntent.putExtra(Intent.EXTRA_EMAIL, new String[] { "test@gmail.com" });
sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Test");
sendIntent.putExtra(Intent.EXTRA_TEXT, "Test");
startActivity(sendIntent);

但是如果包名称更改或包名称不存在，此代码可能会失败。更好地使用它（以及意图选择器）

Intent emailIntent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(
            "mailto", emailId, null));
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "");
emailIntent.putExtra(Intent.EXTRA_TEXT, "");
startActivity(Intent.createChooser(emailIntent, "Send email..."));

Answer 3

在意图中使用intent.setType("message/rfc822")

Answer 4

要打开Gmail应用，请使用以下代码：

Intent mailClient = new Intent(Intent.ACTION_VIEW);
mailClient.setClassName("com.google.android.gm", "com.google.android.gm.ConversationListActivity");
startActivity(mailClient);

要预先填写字段，主题和正文，您可以在意图中添加额外内容，如下所示：

mailClient.putExtra(Intent.EXTRA_EMAIL, new String[] { "hello@gmail.com" });
mailClient.putExtra(Intent.EXTRA_SUBJECT, "hello subject");
mailClient.putExtra(Intent.EXTRA_TEXT, "hello message");

在Android中打开gmail应用程序的意图不幸停止

4 个答案: