如何在android上使用facebook意圖？

Question

爲了在Facebook上分享（同時也是Gmail，短信......）後我已經使用

public class ShareActivity extends Activity { 

    // the button + the editText 
    Button button= (Button) findViewById(R.id.share); 
    EditText text= (EditText)findViewById(R.id.edittext); 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_share);   

     button.setOnClickListener(new OnClickListener() { 
      public void onClick(View v) { 
       Intent intent = new Intent(Intent.ACTION_SEND); 
       // type of intent 
       intent.setType("text/plain"); 
       intent.putExtra(Intent.EXTRA_TEXT, text.getText().toString()); 
       ShareActivity.this.startActivity(Intent.createChooser(intent, "Share : ")); 
      } 
     }); 
    }  
} 

，但是當我開始我的活動它之後setContentView(R.layout.activity_share);調用意外

Answer 1

地方這條線text= (EditText)findViewById(R.id.edittext);停止。

Answer 2

最終代碼：

公共類ShareActivity延伸活動{

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_share);  

// the button + the editText 
    Button button= (Button) findViewById(R.id.share); 
    final EditText text= (EditText)findViewById(R.id.edittext); 


    button.setOnClickListener(
      new OnClickListener() { 
       public void onClick(View v) { 
       Intent intent = new Intent(Intent.ACTION_SEND); 
        // type of intent 
         intent.setType("text/plain"); 
         intent.putExtra(Intent.EXTRA_TEXT, text.getText().toString()); 
         ShareActivity.this.startActivity(Intent.createChooser(intent, "Share : ")); 
       } 
       } 
     ); 

} 

}