Question

我遇到了一个我无法理解的问题。我已经将所有三个按钮带到另一个活动，但问题是他们都引导我参加我只想要我的第一个（简单）按钮的活动。

fragment_main_menu.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.app.whosesloganisthat.MainMenu$PlaceholderFragment" >



         <requestFocus />


     <TextView
         android:id="@+id/textView2"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignTop="@+id/textView1"
         android:layout_centerHorizontal="true"
         android:text="@string/welcometowhosesloganisthat"
         android:textAppearance="?android:attr/textAppearanceMedium" />

     <Button
         android:id="@+id/buttonHard"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_alignLeft="@+id/buttonHard"
         android:layout_alignParentBottom="true"
         android:layout_marginBottom="46dp"
         android:onClick="sendMessage"
         android:text="@string/hard" />

     <Button
         android:id="@+id/buttonEasy"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_alignLeft="@+id/textView2"
         android:layout_below="@+id/textView2"
         android:layout_marginTop="48dp"
         android:onClick="sendMessage"
         android:text="@string/easy" />

     <Button
         android:id="@+id/buttonIntermediate"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_alignLeft="@+id/buttonEasy"
         android:layout_centerVertical="true"
         android:onClick="sendMessage"
         android:text="@string/intermediate" />

</RelativeLayout>

MainMenu.java：

package com.app.whosesloganisthat;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.os.Build;

public class MainMenu extends ActionBarActivity {
    public final static String EXTRA_MESSAGE = "com.app.whosesloganisthat.MESSAGE";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main_menu); //xml file name which contains button


    }

    @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, 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();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /** Called when the user clicks the Send button */
    public void sendMessage(View view) {
        Intent intent = new Intent(this, EasyLevelInfo.class);


        startActivity(intent);
        // Do something in response to button
    }
    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main_menu,
                    container, false);
            return rootView;
        }
    }

EasyLevelInfo.java：

package com.app.whosesloganisthat;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.os.Build;

public class EasyLevelInfo extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Intent intent = getIntent();
        String message = intent.getStringExtra(MainMenu.EXTRA_MESSAGE);
        // Create the text view
        TextView textView = new TextView(this);
        textView.setTextSize(40);
        textView.setText(message);

        // Set the text view as the activity layout



    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.easy_level_info, 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();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_easy_level_info,
                    container, false);
            return rootView;
        }
    }

fragment_easy_level_info.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.app.whosesloganisthat.EasyLevelInfo$PlaceholderFragment" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="42dp"
        android:text="@string/youhaveselectedeasy"
        android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>

谢谢大家！

Answer 1

查看你的fragment_main_menu.xml

layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_alignTop="@+id/textView1"
     android:layout_centerHorizontal="true"
     android:text="@string/welcometowhosesloganisthat"
     android:textAppearance="?android:attr/textAppearanceMedium" />

 <Button
     android:id="@+id/buttonHard"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:layout_alignLeft="@+id/buttonHard"
     android:layout_alignParentBottom="true"
     android:layout_marginBottom="46dp"
     android:onClick="sendMessage"
     android:text="@string/hard" />

 <Button
     android:id="@+id/buttonEasy"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:layout_alignLeft="@+id/textView2"
     android:layout_below="@+id/textView2"
     android:layout_marginTop="48dp"
     android:onClick="sendMessage"
     android:text="@string/easy" />

 <Button
     android:id="@+id/buttonIntermediate"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:layout_alignLeft="@+id/buttonEasy"
     android:layout_centerVertical="true"
     android:onClick="sendMessage"
     android:text="@string/intermediate" />

你有三个按钮buttonHard，buttonEasy，buttonIntermediate。并且这三个按钮具有属性android:onClick = "sendMessage"这意味着如果单击其中一个按钮，请执行sendMessage方法。让我们看一下这种方法。

 public void sendMessage(View view) {
        Intent intent = new Intent(this, EasyLevelInfo.class);


        startActivity(intent);
        // Do something in response to button
    }

此方法启动Activity EasyLevelInfo。因此，如果单击三个按钮之一，它将调用此sendMessage方法并打开EasyLevelInfo活动。

所有三个按钮都会导致相同的活动？

1 个答案: