Android 在安卓系统中点击按钮后，我很难显示谷歌地图？

我正在用android创建一个应用程序

在这个应用程序中，我想在点击按钮后显示谷歌地图

我声明了button和listener

但我的问题是我想在action listener中调用另一个activity类并显示GoogleMap

但它不工作，我把模拟器从谷歌改为安卓它工作，但谷歌API并没有被调用，并向我显示错误

为此，我使用了这段代码，但我的地图没有显示，我的应用程序被终止

//----------------主要活动---------------//

import java.security.PublicKey;

import com.google.android.maps.MapView;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.content.Context;
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.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.os.Build;

public class MainActivity extends ActionBarActivity {

EditText TextFeild;
Button button1;
Context context=this;

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


    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new                PlaceholderFragment()).commit();
    }
}

public void addOnListenerAction()
{
    TextFeild=(EditText) findViewById(R.id.editText1);
    button1=(Button) findViewById(R.id.button1);
    button1.setOnClickListener(new OnClickListener() 
    {

        @Override
        public void onClick(View v) 
        {
            Intent intent=new Intent(context,MapViwer.class);

        }
    });
}




@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 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);
}


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, container,
                false);
        return rootView;
    }
}

}

//_-------------------MapViwer类------------//

import java.security.PublicKey;

import com.google.android.maps.MapView;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.content.Context;
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.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.os.Build;

public class MainActivity extends ActionBarActivity {

EditText TextFeild;
Button button1;
Context context=this;

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


    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new                PlaceholderFragment()).commit();
    }
}

public void addOnListenerAction()
{
    TextFeild=(EditText) findViewById(R.id.editText1);
    button1=(Button) findViewById(R.id.button1);
    button1.setOnClickListener(new OnClickListener() 
    {

        @Override
        public void onClick(View v) 
        {
            Intent intent=new Intent(context,MapViwer.class);

        }
    });
}




@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 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);
}


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, container,
                false);
        return rootView;
    }
}

---

}那么您是说，您有一个名为（MapViwer）的

类，它定义了
布局
，而
类
（MapViwer）包含地图工作的信息。要从
MainActivity.class
部署类，请使用以下方法

在
MainActivity
中的
public类下添加此

private Button button1;

然后添加此函数-

button1.setOnClickListener(new View.OnClickListener() {     
   @Override
   public void onClick(View arg0) {
       Intent i = new Intent(getApplicationContext(), MapViwer.class);
       startActivityForResult(i, 100);          
   }
});

像这样使用它对我有用

Button b=(Button) findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
       // TODO Auto-generated method stub
       Intent intent=new Intent(MainActivity.this,MapViewer.class);
       startActivity(intent);
       }
});

在Mapviewer类中，只需调用Mapviewer.xml

现在，mapviewer.xml应该如下所示

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<fragment
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.MapFragment"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:layout_marginBottom="34dp" />
</LinearLayout>



试试看。
用Mainactivity替换context。这在代码中

Intent-Intent=新的Intent（上下文，mapvower.class）
您只是定义了意图，但没有调用Mapviewr活动

正确代码：

   public void addOnListenerAction()
 {
  TextFeild=(EditText) findViewById(R.id.editText1);
button1=(Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() 
{

    @Override
    public void onClick(View v) 
    {
        Intent intent=new Intent(Mainactivity.this,MapViwer.class);
        startActivity(intent);

    }
});

}