Android 覆盖AlertDialog里的按钮事件并显示Toast

AlertDialog.Builder builder = new AlertDialog.Builder(MyWebViewTest.this);
builder.setTitle("这是标题");
builder.setMessage("这是内容");
builder.setNegativeButton("no",new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(),"no",Toast.LENGTH_LONG);
}
});
builder.setPositiveButton("yes",new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(),"yes",Toast.LENGTH_LONG);
}
});
builder.show();

AlertDialog.Builder builder = new AlertDialog.Builder(MyWebViewTest.this);
builder.setTitle("这是标题");
builder.setMessage("这是内容");
builder.setNegativeButton("no",new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) {
//Toast.makeText(getApplicationContext(),"no",Toast.LENGTH_LONG);
}
});
builder.setPositiveButton("yes",new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) {
//Toast.makeText(getApplicationContext(),"yes",Toast.LENGTH_LONG);
}
});
AlertDialog dialog = builder.create();
dialog.show();//这里必须先show，下面才能获取到button，否则报空指针
dialog.getButton(Dialog.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),"yes",Toast.LENGTH_LONG).show();
}
});
dialog.getButton(Dialog.BUTTON_NEGATIVE).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),"no",Toast.LENGTH_LONG).show();
}
});