Question

你好，我对android编程很新。我希望得到一些关于在新激活的活动下在字符串消息下显示按钮的帮助。希望可以有人帮帮我。以下是MyActivity类的代码，它在按下按钮应用程序教程时激活。我的主要活动的xml也在那里。此外，displaymessage活动类和xml也在那里。

package com.example.sadi_ace.myfirstapp;

import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;


public class MyActivity extends ActionBarActivity {

    public final static String EXTRA_MESSAGE = "com.example.sadi_ace.myfirstapp.MESSAGE";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        setContentView(R.layout.activity_my);

        }


    /** Called when the user clicks the Send button */
    public void TutorialText(View view) {
        Intent intent = new Intent(this, DisplayMessageActivity.class);
        String message = "This is the android tutorial, if you want to pass on the to the " +
                "functions please press SKIP!";
        intent.putExtra(EXTRA_MESSAGE, message);
        startActivity(intent);



    }





  //  @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_my, 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);
    }
}

主要活动的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:orientation="vertical"
    android:background="#800080"
    android:weightSum="1">


    <Button
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:text="@string/button_tutorial"
        android:background="#FFFFFF"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:onClick="TutorialText"
         />
</RelativeLayout>

DisplayMessageActivity类代码

package com.example.sadi_ace.myfirstapp;

import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;


public class DisplayMessageActivity extends ActionBarActivity {




    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Intent intent = getIntent();
        String message = intent.getStringExtra(MyActivity.EXTRA_MESSAGE);

        // Create the text view
        TextView textView = new TextView(this);

        textView.setText(message);

        // Set the text view as the activity layout
        setContentView(textView);
    }


    //  @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_display_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);
    }
}

DisplayMessageActivity类的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:orientation="vertical"
    android:background="#800080"
    android:weightSum="1">



</RelativeLayout>

Answer 1

在xml文件activity_my中添加按钮，如

   <Button
    android:id="@+id/btnskip"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

之后在＆＃34; onCreate＆＃34;中使用此按钮ID方法并将其分配给某个按钮

  Button skip;
 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    setContentView(R.layout.activity_my);
     skip=(Button)findViewById(R.id.btnskip);

  //add on click listener
    skip.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
         Intent intent = new Intent(this, DisplayMessageActivity.class);
    String message = "This is the android tutorial, if you want to pass on the to the " +
            "functions please press SKIP!";
    intent.putExtra(EXTRA_MESSAGE, message);
    startActivity(intent);
    });
    }

在字符串消息下显示按钮

1 个答案: