getApplicationContext()和this的区别在于getApplicationContext()更安全，比this要安全。因为this的话会产生内存泄漏。
下面是getApplicationContext()的具体应用
package cn.xhhkj.xhhkjtest;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener{
private Button btn_down;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_down = (Button) findViewById(R.id.btn_download);
btn_down.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),"节日快乐",Toast.LENGTH_SHORT).show();
}
}
